Structural Design Optimization of Wind Turbine Blade

Wind turbine blade design to reduce edgewise vibrations and fatigue loads without adding weight or complexity. The blade has a unique airfoil shape with a bump section near the trailing edge. The bump section has a thicker pressure side compared to the rest of the blade, causing the blade to flex less in edgewise vibrations. This reduces fatigue loads and noise compared to conventional blades. The bump section can be a separate airfoil section or integrated into the blade.

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Wind turbine blade design with internal fluid pressurizers to improve efficiency and reduce load requirements compared to conventional blades. The blade has a main body with a cylindrical front section and a different cross-sectional rear section. Channels connect suction openings on the rear to injection openings on the front. Fluid pressurizers are placed inside the channels. This co-flow jet configuration forces air through the blade, reducing stall and improving lift at lower wind speeds. It also allows higher tip speeds without increasing loads since the internal pressure provides support.

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Airfoils for rotating turbines and propellers that improve efficiency and reduce drag compared to conventional airfoils. The airfoils have curved helical shapes with fins attached to the blades. The fins are positioned asymmetrically on the upper and lower halves of the blades. This configuration allows the fluid to flow through channels between the fins. It provides better connectedness and reduces drag compared to straight blades. The fins also divide the helical sections into equal parts. This allows uniform spacing between fins on each blade.

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Improving wind power plant efficiency is crucial due to the increasing demand for renewable energy. This study analyzes aerodynamic characteristics of a equipped with two combined blades that integrate fixed and rotating cylinders. The object model designed optimize airflow direction enhance lift. methodology involves numerical modeling using Ansys Fluent software package, as well experimental testing under laboratory conditions. main results show when air-flow velocity increases from 3 12 m/s, thrust force rises 0.5 N 3.85 N. Comparative analysis minimum maximum pressure on blade surfaces demonstrates strong correlation between rotational speed elevated differentials: pmax approximately 0.4 Pa 0.7 Pa, while pmin about 0.15 Pa. coefficient decreases 1.45 1.05 Reynolds number (Re) increases, indicating improved during transition turbulent flow. A comparative data reveals deviation no more than 5%, confirming models reliability soundness research methodology. conclusions indicate employing can by 810% compared traditional designs. improvement may foster development efficient stab... Read More

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This study presents mathematical models and numerical-analytical methods for analysing static stresses, free/forced vibrations, the durability of radial turbomachinery used in power transportation systems. The research incorporates deliberate disturbances geometric, mass, mechanical parameters to evaluate their effects. finite element method is as primary analytical tool, supported by theories elasticity vibration, mechanics deformable solids, gas dynamics. methodology employs matrix computations algebraic equation systems predict service life characteristics turbomachine rotors. Custom software interfaces compatible with ANSYS commercial were developed. Computational studies demonstrated influence parameter mismatches on dynamic loads both prototype industrial compressors/turbines. For a air handling unit manufactured Schiele AG (Germany), variations resulted alteration rotor 10.76% +14.84%. numerical analysis tools implemented 2024 at Irkutsk Research Design Institute Chemical Petrochemical Engineering (Russia). efficiency prediction strength optimisation during design, fine-tun... Read More

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In this study, the aerodynamic performance of different wind turbine blades including FX 63-137, NACA 6415, 63-415 has been investigated. XFLR5 employed to analyze blade at Reynolds numbers ranging from 1.5x105 1x106 and low angles attack (00200). The lift (CL), drag(CD), pitch moment (CM) coefficients, lift/drag coefficient ratio (CL/CD) have evaluated. Numerical coefficients obtained using literature beeen compared it found that they compatible with each other. According numerical analyzes, highest coefficient-to-drag ratio, as called efficiency, was 109.14 FX63-137 Re number 1x106, lowest 2.63 blade. Also, maximum profile 104.28, while for NACA6415 102.11 1x106. analysis results show increases increase in angle up stall angle, then begins decrease all studied blades.

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Abstract This study explores the development and optimization of polymer composite-based wind turbine blades, integrating glass fiber reinforced plastic (GFRP) with shape memory alloy (SMA) to enhance performance in energy harvesting. Advances materials science, aerodynamics, computational modelling, structural analysis have been leveraged improve blade efficiency, durability, self-adaptive capabilities. The research employs finite element (FEA) artificial neural networks (ANN) evaluate mechanical behaviour composite blades under varying loads. A graded beam model was developed assess effects ply drop-off material distribution on integrity. Experimental validation confirmed that SMA integration enhances deformation recovery, mitigating stress accumulation improving aerodynamic stability. results demonstrate GFRP-SMA achieve a coefficient approaching Betz limit (0.5923), reducing deflections load response. Despite these advancements, challenges remain optimizing wire placement, adhesion, actuation efficiency. Future work should focus refining interfaces, developing adaptive control me... Read More

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An airfoil is the cross-sectional shape of a wing, blade, or sail, designed to generate aerodynamic forces as it moves through air. When interacting with airflow, an generates lift and drag forces. To standardize design, National Advisory Committee for Aeronautics (NACA) developed various families, extensive studies focused primarily on 4-digit series. However, limited attention has been given behaviour 5-digit This study assesses performance NACA 23012, airfoil, under varying Reynolds numbers angles attack establish its suitability high wind turbind. Computational Fluid Dynamics (CFD) simulations were conducted at (AoA) 8, 12, 16, 20, 24, 3.0106, 6.0106, 8.8106. The objective was identify conditions that yield optimal in terms lift-to-drag ratio (L/D), coefficient (CL), (CD). Results showed increase increasing AoA up critical range between 12 beyond which flow separation stall effects reduced efficiency. observed 8 angle number 8.8106, where relatively low resulted favourable ratio. A linear regression analysis revealed insignificant variation CFD results stand... Read More

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Method for designing and manufacturing a turbine blade that optimizes blade geometry and material properties to prevent blade failure due to flutter, forced response, and synchronous vibration. The method involves analyzing stresses on the blade and using the results to modify the blade shape. If stress concentrations are found near the root or tip, fillets or thickness changes are made in those areas. If resonance frequencies are found below a certain range, additional modifications like shifting upper airfoil slices or increasing fillet radius are made. This iterative process of stress analysis and geometry adjustment aims to prevent failure mechanisms like flutter while minimizing weight and material usage.

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ABSTRACT To enhance the performance of wind turbines, this study investigates integration two energy harvesting systems. An optimal turbine configuration has been identified by using dual rotor (DRWT) technology with a novel blade design known as humpback blade, which is inspired fins whales. This features tubercles and ridges along leading edge that extend over last third blade's length. The innovative lowered nominal angle attack in comparison to conventional blades, led significant boost lift notable reduction drag forces. enhancement lifttodrag ratio enabled more efficient rotation at lower speeds. Furthermore, single turbines fitted these blades showed improved extraction decreased turbulence intensity behind rotor, making them especially effective DRWT setups. results validated benefits systems, where new enhanced both upwind downwind positions, resulting higher overall output than standard blades. As result, different configurations have tested examined. proposed position resulted increase ratio. Similarly, employing . These enhancements lead greater from DRWTs compared ... Read More

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Facing the difficulty of accessing electricity in some locations Amazon favor emergence alternative sources such as wind energy. Despite notorious applicability using turbines for generating electricity, regions with low speeds present a challenge design efficient rotors condition. Thus, this work aims to rotor adapted speed (3.5 - 12 m/s). The proposal uses blade element theory and compare it computational fluid dynamics. turbine is horizontal axis 6.57 m diameter 4 blades. It identified that designed can obtain maximum output power 1200 W, while coefficient 0.341 0.375 BET CFD approaches, respectively. Therefore, be stated results obtained satisfactory agreement promising generation speeds.

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As the size and flexibility of wind turbine blades increase, aeroelastic challenges faced by turbines become more pronounced. To prevent blade damage due to vibration improve stability blades, this paper proposes a bionic with web inspired bamboo honeycomb structures. The fluid-solid interaction analysis is conducted using computational fluid dynamics finite element method, based on Shear Stress Transport (SST) k-w turbulence model. displacements, stresses, strains, modal, harmonic response analyses both original are evaluated underrated operating conditions. results indicate that, compared blade, maximum displacement reduced 10.1%, stress value surface 2.1% lower, strain 2.5% lower. buffers loads in stages during deformation leading improved resistance.

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A windmill design that improves rotation energy conversion efficiency compared to conventional windmills. The windmill has a blade with a front edge and rear edge, and a supporting member that connects the blade and shaft. The supporting member has a front end and rear end. A straight line passing through the middle of the supporting member and parallel to the radial direction intersects the blade chord line at the rear edge midpoint. This configuration balances centrifugal forces on the blade and supports them more efficiently.

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A wind turbine blade design with improved efficiency and bird safety. The turbine has a central hub with spokes connecting to a peripheral rim. Blades are mounted inside the rim near the edge. This reduces stress on the blades compared to cantilevered designs. The interior edge gap between blades and hub prevents birds flying into the blades. The blades rotate at a constant angle of attack. This optimizes power extraction by matching blade tip speed to the wind. The blades are adjustable for blade length variation.

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Vertical axis wind turbine rotor with optimized blade twist for improved efficiency. The rotor has aerodynamic profiles with distinct leading and trailing edges that operate at blade speeds greater than 1.5 times the incoming wind speed. The blade twist is optimized by having a smaller angle shift between the trailing edge at ¼ and ½ blade height compared to the ½ and ¾ heights. This reduces flow separation and vortex formation for better lift generation. The blade twist along the whole rotor height should be at least 90% of the full angle divided by the number of blades, preferably 100-120%.

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Turbine design for wind power generation that improves efficiency by allowing blades to expand and close as the turbine rotates. The blades pivot on a rotary shaft and have stoppers to limit expansion angles. Elastic members connect the blades to the shaft. In the expanded position, the blades face the stoppers to capture more wind force. In the closed position, the blades are near the shaft to reduce drag. This eliminates negative power during blade reversal. The turbine can be integrated in a channel structure where the blades touch the walls when closed. The blades expand when diverted fluid flows between the walls. This allows high fluid speed entry and extraction. The turbine also integrates anti-friction members and cover sheets for pivotal motion.

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Impeller design for wind turbines that improves power generation efficiency and noise reduction. The impeller has blades that widen outwards towards the outer edge. The blade leading and trailing edges form overlapping segments on the front and rear sides of the impeller in the front view. This configuration allows more wind area capture without increasing blade count. The wider blade shape also reduces noise by smoothing airflow transition. The impeller can be used in a streamlined wind tunnel to further enhance efficiency.

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Rotating airfoil design for rotating systems like wind turbines and propellers that improves efficiency compared to conventional airfoils. The rotating airfoil has a concave working surface for lift generation and a convex section connected by motion transmitting members. The concave surface has veins for boundary layer effect. This allows autorotation, rapid fluid displacement, and retardation. The veins create a disturbed layer on the surface reducing direct fluid-blade interaction and drag. The convex section connects to the power generator.

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Wind turbine rotor design for cross-flow applications that improves efficiency and reduces vibrations compared to conventional Savonius-style turbines. The rotor has primary blades around a central axis and secondary blades positioned between the primary blades. The secondary blades are smaller than the primary blades. This configuration allows the secondary blades to capture additional wind energy and redirect it into the primary blades, enhancing overall performance. It also concentrates the force of the wind on the primary blades, reducing return drag and vibrations compared to having more primary blades.

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A wind turbine system with adjustable blades that can optimize drag and lift forces for higher efficiency, lower wind speeds, and reduced damage. The system has multiple blade assemblies with pivoting sub-blades. A main control unit adjusts the sub-blade angles during rotation to optimize forward drag and lift. This is done by rotating the blade shafts using primary control arrangements. The sub-blades open and close using secondary control arrangements. This allows partial or full blocking of wind flow. The blade panel design with adjustable sub-blades enables higher efficiency at lower speeds, protection against high winds, and smoother torque output during gusts.

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A vertical axis wind turbine blade design to improve performance by delaying blade stall. The blade has a leading edge slat with a curved hollow channel extending from the slat to the blade surface. An airflow blocker obstructs the channel. This creates a suction effect that helps prevent flow separation and stall. The slanted leading edge with the curved channel and blocker allows reattachment of the airflow. The design allows higher angles of attack before stall compared to conventional blades.

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Vertical axis wind turbine blade with a curved hollow channel and an airflow blocker to delay stall and improve performance. The blade has a leading edge slat and a curved hollow channel extending from the slat to the blade surface. An airflow blocker is placed in the channel to prevent airflow separation. This creates a localized low pressure region and promotes airflow reattachment during stall conditions. The curved hollow channel and blocker design delays stall and improves performance compared to traditional blades.

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Wind turbine design with a hollow center and blades mounted off-center to maximize power extraction. The turbine has a rotor with blades at the outer radius, mounted on supporting rods. This allows airflow to pass through the center undisrupted or accelerated to create higher velocity behind the turbine. The hollow center reduces wind drag and entrains faster moving air. The turbine can have a generator inside the center or mounted separately. The off-center blades leverage the "entrainment effect" to improve performance.

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Rotor blade design for wind turbines that reduces drag and noise while maintaining efficiency. The blade has a blunt trailing edge with a short trailing-edge region of less than 30% chord length. Inside this region, turbulators are placed on the suction side and/or pressure side. This prevents flow separation and vortices that cause drag and noise. The turbulators are small protrusions aligned parallel to the blade thickness. The blade can also have transition regions near the trailing edge to smoothly connect the profile and blunt edge. This avoids sharp corners that cause vortices.

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A horizontal axis wind turbine designed for urban and offshore locations to improve efficiency, especially in low wind areas. The turbine has twisted blades with cambered airfoil profiles that produce lift force to rotate the turbine. The blades have varying thickness along the camber line. The turbine also has a conical hub section and a conical outer shroud section that widens towards the rear. This shape helps orientation stability in changing winds. The turbine is mounted on a frame that can yaw independently of the tower. This allows it to face the wind for maximum power extraction. The turbine can be used in urban areas, on buildings, near coasts, offshore, etc.

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Passively modifying the airfoil shape of wind turbine blades to improve lift and reduce noise at low angles of attack using deformable elements that respond to local air pressure. The deformable elements are attached to the blade surface and deform when pressure builds up. This alters the blade thickness and profile without active control or components. The deformable elements can have fillers, semi-permeable membranes, or chambers to enhance their deformation.

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Rotor blade design for wind turbines that provides a secure and reliable connection between the blade and hub while also being easy to assemble and service. The blade has a bearing cover on the hub-side end that extends further away from the outer surface closer to the bearing compared to the remote side. This creates an intermediate space between the blade and cover near the bearing to accommodate a portion of the fixed blade bearing. This allows the blade to be fastened to the movable part of the bearing without interference. The bearing cover segments can be connected in a detachable manner for access. The hub has a flange near the bearing with a slot for accessing the blade fastening bolts. This allows pretensioning, nutting, and partial release of the bolts through the slot.

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Wind turbine system with adjustable blades that optimize lift and drag forces at all wind speeds. The turbine has multiple rotating blade assemblies with pivoting sub-panels. The main rotor and blades rotate tangentially to the wind. The sub-panels can rotate independently during each rotation to continuously optimize the blade attack angle. This allows forward drag to be maximized and reverse drag minimized. The sub-panels also open/close to further reduce reverse drag. Sensors monitor wind, rotor speed, etc. to dynamically adjust the blade angles. This improves efficiency across wind speeds and prevents damage at high speeds.

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A wind turbine blade design with a unique pitch control mechanism that automatically adjusts the blade angle to optimize performance without using complex mechanical or electrical systems. The blade has a mass-balanced spar stub located forward of the airfoil's aerodynamic center. The airfoil is reflexed, meaning it has an upward camber line at the trailing edge. This creates a positive pitching moment. The blade can rotate freely around the spar stub axis. The reflexed airfoil pitches itself to the optimal angle due to aerodynamic forces, as any perturbation causes it to return to the trimmed position. This self-aligning blade design maximizes power extraction without requiring sensors or actuators.

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A vertically oriented wind turbine with variable-tilt blades that can capture more wind energy by optimizing blade orientation for different wind conditions. The turbine has blades that can rotate 90 degrees around a central hub as they pass a fixed ring. This allows the blades to present a broad capturing surface when facing the wind, and a narrower profile when not. Tilting levers, a blade ring, and blade guides mechanically control the blade rotation. This enables blades to be optimized for wind capture while minimizing drag during rotation.

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Wind turbine blade design with improved structural strength and ease of manufacturing. The blade has an outer skin, inner skin, spar caps between them, and shear webs connecting the spar caps. At least one spar cap is made by impregnating resin with reinforcing fiber sheets, while the others are made with stacked support plates with reinforcing fibers. This allows flexibility for bending and twisting of the reinforcing fiber sheets in the impregnated spar cap, while the stacked support plates provide rigidity.

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A wind power generation device with a spiral blade that improves efficiency compared to conventional wind turbines. The device has an outer stator assembly and an inner rotor assembly. The rotor has a spiral blade attached to a column. The stator has a frame, an induction module, and a positioning member. The induction module is positioned between the rotor's magnetic modules in the annular gap around the blade. As the rotor turns, the induction module sweeps through, generating an induced current. This captures more power from the blade tip vortices compared to traditional vertical blades.

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A wind turbine rotor design with a smaller secondary blade near the hub to improve power extraction at low wind speeds. The rotor has a primary blade and a shorter secondary blade. The primary blade extends further than the secondary blade. This allows the secondary blade to sweep over the region near the hub where the primary blade would have a suboptimal induction factor due to the rotor tip speed. The secondary blade's shorter length allows it to optimize induction in that area. The primary and secondary blades can be arranged on the hub along with pitch controls. This hybrid rotor design combines stall control near the hub with pitch control at higher speeds.

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A wind turbine design to increase efficiency and protect against adverse weather conditions. The turbine has a unique tapering body shape with a hemispherical fairing on top. The fairing creates low pressure above the turbine blades like an aircraft wing. This induces airflow through the blade plane. In bad weather, the fairing can retract downward to block precipitation and objects. This prevents ingress while still allowing high-speed airflow through the blades. The retractable fairing allows efficient operation in adverse conditions.

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A segmented self-positioning wind turbine assembly with adjustable airfoils for optimal wind capture. The turbine has a hub, rim, and cables connecting a set of rotatable airfoils between them. Each airfoil has a slight twist angle difference from its neighbor to self-align in wind. This allows the turbine to optimize energy extraction as wind direction changes. The airfoils can have upturned sections at the trailing edges to further adjust angles. The hub has an inner and outer cable with inner and outer sets of airfoils. This segmented design reduces weight and cost versus single large blades.

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A horizontal-axis wind turbine that overcomes the issues of low efficiency, high cut-in speeds, and sensitivity to wind fluctuations in micro wind turbines. The turbine has a unique blade configuration with two cooperating profiles that allows efficient operation over a wide range of wind speeds and angles of attack. The blades have variable chords and are twisted to match the rotational speed of the turbine. This allows the blades to maintain lift even at low Reynolds numbers where conventional profiles stall. The blades also have an elastic hinge on the hub to prevent overspeeding in high winds. This allows the turbine to operate at higher tip speeds for better efficiency without risking damage.

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A wind turbine rotor design with multiple blades arranged in an alternating configuration to improve cross-flow wind turbine performance. The rotor has a central axle with primary blades spaced around it. Smaller secondary blades are positioned between the primary blades. This configuration reduces return drag by redirecting wind force into the primary blades, while adding energy capture from the secondary blades. The alternating blade sizes allow more blades to be used without negatively impacting performance.

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Rotor blade design for wind turbines that improves efficiency and reduces noise compared to conventional blunt trailing edges. The rotor blade has a reduced trailing edge length on the suction side and/or pressure side compared to the full chord. Eddy generators are added in this region to create turbulent flow. This reduces separation and vortex shedding compared to a blunt edge. The generators are positioned near the trailing edge and extend a short distance. The reduced trailing edge length prevents excessive depth increase. The generators can be in suction side and/or pressure side regions.

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Wind turbine blade design to protect it from erosion in a way that covers only the areas most prone to erosion without wasting material. The anti-erosion layer on the blade is offset toward the pressure side from the leading edge. This allows targeted protection of the areas where erosion is more likely, like the pressure side near the leading edge where rain and debris strike at an angle. The center point of the anti-erosion layer is shifted towards the pressure side from the leading edge along the blade profile. This provides appropriate protection for the areas most susceptible to erosion without covering the whole blade.

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Variable tilting blade windmill design that can capture more wind energy than fixed blade windmills. The windmill has multiple turbines with blades that can rotate between a flat capture position and a slicing position. This allows the blades to present the maximum surface area when facing the wind and then rotate to slice through the wind when not in an ideal location. The blades can be manually or automatically rotated using levers, rings, posts, or motors based on wind direction. This increases the effectiveness of wind capture by enabling the blades to better harvest the available energy from the wind.

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Foldable wind turbine blades that can retract into the hub to reduce wind resistance in high winds. The blades pivot on hinges at the hub and can be folded by actuators. This allows the blades to lie close to the tower when retracted, significantly reducing the turbine's profile and drag. The folding mechanism has brakes to hold the blades closed during storms. The turbine also has devices to lock the blades in place when folded to prevent them from flapping in high winds. This allows the turbine to withstand extreme winds without needing a heavy, expensive structure. The blades can be opened and closed manually or automatically using batteries when the main power source is disconnected.

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A system for manufacturing wind turbine blades with improved strength, weight, and cost efficiency. The system involves using preform layers of multiple rigid strength elements like rods stacked in a web format. The preforms are cut and dispensed from a continuous web for blade component fabrication. The preforms have tapered end zones that allow separation. The rods are collimated fibers in resin for high strength. The preforms are stacked with carrier layers and bonded resin between. The web format allows efficient storage, shipping, and dispensing of preforms compared to rolls. The tapered zones facilitate cutting. This provides blade components like spar caps with higher fiber volume fraction, reduced fiber wash, and lower resin shrinkage.

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Fiber-reinforced composite blank for wind turbine blades that enables high stiffness and strength without adding weight or complexity compared to conventional methods. The blank has a layered structure with a form core sandwiched between a fiber layer. Reinforcing rods are inserted into the form core at angles to reinforce it. This provides shear and bending stiffness without needing connecting elements through the entire thickness. The rods can be angled to optimize force transfer. After curing, the matrix binds the composite layers together. This allows making wind turbine blade sections with custom stiffness and strength for load areas without adding weight or complexity compared to conventional methods.

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A wind turbine design that improves efficiency and reduces visual impact compared to conventional horizontal and vertical axis turbines. The turbine has blades oriented radially away from the shaft with openings between the shaft and blades. An air flow director shields blades from counter-rotation air. The blades pivot to reduce drag when not facing wind. The air flow director accelerates air through the turbine. The blades have convex shapes to maximize lift. This allows blades to rotate with wind instead of fighting against it. The turbine can feather into the wind to stop rotation in high speeds. The air flow director can be shaped to optimize air flow and visibility.

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A lightweight vertical windmill blade design that reduces weight and improves efficiency compared to traditional metal blades. The blade has a frame structure with cutouts covered by a layer of flexible sheet material like PTFE instead of metal. The sheet material is attached over the cutouts on the exterior or interior surface of the blade. This reduces weight while maintaining blade strength. The flexible sheet also covers the cutouts to improve airflow and reduce drag compared to exposed cutouts.

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Wind power generation system with increased efficiency and scalability compared to conventional wind turbines. The system has multiple aligned wind turbines, flanked by blade units with inner shapes extending along the circumferences of circles defined by the turbine rotations. This enhances wind collection around the turbines. Additional outer turbines and blades gather wind that passes through the inner units. The setup converts the rotational energy using a conversion unit. The blade shape and configuration increases wind capture and allows scaling by adding more turbines and blades.

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Wind turbine blade design that enables more compact transportation and reduces load on pitch bearings compared to conventional blades. The blade has an inner section connected to the hub and an outer section pivotally connected to the inner section. This allows pitching the outer section relative to the inner section to optimize blade angles without requiring large pitch bearings at the root. The inner and outer sections can be disassembled for shipping, reducing transportation costs.

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Wind turbine generator design for low to moderate wind areas that addresses the limitations of using large turbines in those conditions. The design features a rotor with shorter, wider blades to improve efficiency compared to narrow long blades. The shorter blades have a lower aspect ratio but can extract more power at lower wind speeds. The shorter blades also reduce bending forces on the hub and drivetrain compared to longer blades. The shorter blades also allow a simpler, lighter, two-stage gearbox instead of a multi-stage gearbox. The design also uses a two-piece hub instead of a large one-piece hub, making transportation and assembly easier.

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A wind generator system with biomimetic vertical axis blades that improves efficiency by mimicking bird wing geometry. The blades have scoops with angled sections that increase lift and decrease drag compared to conventional vertical axis rotors. The scoop angles create a hook and twist shape similar to bird wings. This geometry harnesses more wind energy while reducing drag as blades rotate.

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A wind turbine design with a vertical rotor axis that can convert wind power efficiently in low wind speeds while also having horizontal rotor axis operation for higher wind speeds. The turbine has three vertical airfoils arranged in a V shape with a central airfoil having a generator inside. The side airfoils have smaller cross-sections than the central airfoil. Curtains can be adjusted to control airflow. The central airfoil has inlets from the side airfoils that feed into a diffuser directing air to the generator rotor. This allows vertical axis operation in low winds as the airfoils intercept wind. In high winds, the curtain adjustment can change the airfoil shape to horizontal axis.

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