Airflow Enhancement for Wind Turbine Blades

Vertical axis wind turbine (VAWT) that continuously adjusts each blade's pitch angle throughout every rotation so the rotor can spin at a much lower tip speed ratio than conventional VAWTs, significantly reducing aerodynamic drag losses that scale with the cube of blade speed. A set of cam disks - one per wind speed - physically encodes the optimal blade angle for every point in the rotor's circular path, giving smooth, continuous pitch control without discrete steps. Each blade pivots via a direct-drive torque motor mounted right on its pivot axis, eliminating any mechanical intermediary and keeping pitch positioning errors below 1.5°. Wind sensors are placed just outside each blade's own airflow disturbance zone to give the control system accurate local wind readings. A secondary feature is a built-in winch-and-pulley system in the tower that allows all major components to be hoisted without large cranes, with a small crane placed on a rotor arm for blade-level maintenance.

Source

Wind apparatus that maximizes the amount of kinetic energy captured from an air flow by changing the aerodynamic behavior of its blades over time in response to the air flow. The apparatus has blades that move along curved guides when hit by wind, rotating to optimize capture. This allows the blades to respond to changing wind directions and speeds, increasing energy capture compared to fixed blade designs. The blade motion is transmitted through mechanisms to turn shafts and generate electricity.

Source

Drag-reducing turbine with blades that fold flat against the shaft on the return stroke and spring back open on the power stroke, so only the power stroke generates useful torque. Each blade is hinged at one edge to the shaft, with a spring pulling it open and a fixed stop limiting the fully open angle. A surrounding channel housing completes the mechanism: its walls passively push each blade shut at precisely the right point in each rotation, requiring no active control. Multiple such turbines can share a single generator by connecting their shafts through one-way clutches, so each turbine contributes torque independently without opposing the others.

Source

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.

Source

Self-starting curved rotor blade for wind, hydro, and propulsion applications, designed to overcome the poor rotational performance of conventional airfoils that were originally developed for straight-line flight. The blade's scoop-like shape captures fluid on its concave face, where a central spine guides the flow from the leading edge toward the exit point, generating torque through continuous rotation without needing an external starting force. Small ridges covering both faces of the blade create a thin boundary layer that keeps the bulk fluid from contacting the surface directly, reducing drag and improving overall efficiency.

Source

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.

Source

Paddlewheel-style wind turbine that makes drag — the largest component of wind force, several times greater than lift — drive the rotor instead of opposing it, as it does in conventional propeller-type turbines. Each blade continuously adjusts its angle throughout every rotation so that lift is also captured in the same rotational direction rather than working at cross-purposes to drag. Each blade is built like a venetian blind, with slats that open on the return stroke to shed wind resistance, and open fully during storms so the turbine keeps generating power at wind speeds that would force a conventional turbine to shut down. A controller reads wind direction, speed, and blade position in real time and adjusts both the blade angle and slat opening continuously.

Source

VAWT blade that delays stall by using the blade's own pressure difference to inject air onto its upper surface before airflow separates. A slat embedded in the leading edge acts as the inlet to a curved internal channel that carries this high-pressure air to the upper surface, re-energizing the boundary layer. A valve inside the channel controls how much air passes through. The valve can be fixed for passive operation or actively opened and closed by sensors responding to blade position or airflow conditions during each rotation.

Source

Vertical axis wind turbine blade that counters stall by routing high-pressure air from its leading edge through an internal curved duct to blow onto the upper (low-pressure) surface, keeping airflow attached. An internal pocket near the leading edge collects incoming air and feeds it into the duct. A louvered valve inside the duct controls how much air passes through. Because stall occurs predictably at certain points in each rotation, the valve can be cycled open and closed at the right moment — triggered by onboard airflow or position sensors — to deliver the boost exactly when needed.

Source

Vertical axis wind turbine with individually motor-driven blade pitch, allowing each blade to continuously adjust its angle as it orbits the rotor, rather than being fixed or driven through shared mechanical linkages. Each blade mounts directly onto the shaft of its own dedicated pitch motor, so the motor shaft and blade axis are one and the same — no linkages in between. Wind sensors near each blade feed a controller that uses pre-calculated pitch profiles to set the ideal blade angle at every point in the orbit, keeping each blade aerodynamically efficient throughout a full rotation.

Source

Wind turbine with a ring-shaped rotor that improves efficiency by clearing the central hub area — aerodynamically useless in conventional turbines since blade speed near the center is too low to generate meaningful lift — and replacing it with a fan that actively increases airflow through the main blades. The blades are mounted only on the outer portion of the rotor, where rotational speed is high, and the center-mounted fan, driven by the same shaft, creates a low-pressure wake behind the rotor that pulls more air through it. The generator can be built into the blade-supporting rim rather than housed in a central nacelle, and the fan can be coupled to the shaft via a freewheel to maintain its spin when rotor speed drops.

Source

A wind turbine blade design with self-aligning pitch control that maximizes performance by automatically adjusting blade angle of attack in response to changing wind speeds. The blade has a spar stub that allows the airfoil section to rotate freely around its longitudinal axis. The axis is located forward of the airfoil's aerodynamic center. The blade is mass balanced around this axis. This configuration causes the blade to trim itself to the optimal angle of attack for lift vs. drag based on wind and rotational velocity. Any perturbations cause the blade to rotate back to trim.

Source

Monitoring air flow over a wind turbine blade to improve blade design and control by placing a simple device on the blade surface. It has two air inlets facing opposite directions along an axis. A sensor module with two pressure sensors, one connected to each inlet, outputs signals. Processing determines flow direction based on pressure difference sign and speed based on magnitude. Additional inlets and sensors can provide additional flow data. The device is integrated in the blade and wirelessly communicates.

Source

Wind turbine blade with turbulators placed right at the blunt trailing edge to break up the rhythmic vortex shedding that blunt edges inherently produce — a major source of drag and tonal noise. The turbulators sit on the suction side, pressure side, or both, within the last 30% of the chord, disrupting vortex formation at its source rather than managing its downstream effects. Their height is kept between 20% of the local boundary layer height and 50% of the trailing-edge height — tall enough to be effective, but small enough to avoid adding meaningful drag or increasing blade depth.

Source

Self-adjusting aerodynamic patch for wind turbine blades that passively reshapes the blade's camber profile in response to local airflow pressure, eliminating the need for motors, actuators, or control systems. The patch is a breathable, flexible membrane attached to the blade surface, forming a sealed air pocket between itself and the blade. Air slowly bleeds through the membrane to equalize pressure between the pocket and the outside airflow — causing the membrane to puff outward when outside pressure drops and flatten back when it rises — continuously tuning the blade's aerodynamic shape during operation. This gives the blade a self-optimizing profile that improves lift and reduces trailing-edge noise without the complexity and maintenance burden of active flap systems.

Source

Suction-driven wind turbine where the turbine is never directly in the wind's path. Instead, two sets of airfoils flanking a central hollow body accelerate passing wind through the gaps between them, generating a suction that pulls a separate internal airstream through the turbine and out the open back of the body. Because the external airflow driving the suction and the internal airflow spinning the turbine are independent streams, each can be optimized separately — a flexibility that conventional and shrouded rotor designs, which rely on a single flow stream, cannot offer.

Source

Drag-based wind turbine that overcomes the main drawback of drag-driven designs — that blades fight the wind on their return stroke — by building each blade as a set of hinged panels that open like shutters on the return, letting wind pass through. The rotor axis is vertical and wind acts tangentially, so drag pushes the blades around the rotation rather than axially through it as in conventional lift-based turbines. A control unit continuously tracks each blade's position in the rotation cycle and adjusts both its angle to the wind and how open its panels are, maximizing the push on the downwind stroke and minimizing resistance on the return. In extreme winds, fully opening all panels lets the turbine keep running rather than shutting down.

Source

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.

Source

Wind turbine with self-twisting blades that face flat into the wind on the driving side of each revolution and turn edge-on to slip through it on the return side, reducing the drag that limits fixed-blade turbines to roughly 30-35% energy capture. Each blade is mounted on a sleeve that can spin freely around its support arm, like a flag that can rotate on its pole; a small motor turns the sleeve to twist the blade. A wind vane and controller automate the twist timing based on wind direction. Two such blade sets are mounted on opposite ends of a shared horizontal shaft, which drives a generator.

Source

Wind deflector for vertical-axis wind turbines (VAWTs) that recovers efficiency lost when one blade pushes against the wind during rotation. The deflector sits beside the turbine and acts as both a nozzle and a shield: its tapered channel accelerates incoming wind onto the advancing blade, while its solid wall hides the returning blade from the oncoming wind. A secondary duct then redirects airflow around the side through an angled outlet, giving the returning blade a push from behind rather than leaving it exposed to drag. The assembly can rotate to stay aligned with shifting wind direction.

Source

Wind generator with improved efficiency, stability, and noise reduction compared to conventional wind turbines. It uses an elliptical base with rollers on rails to allow the blades to pivot and follow the ellipse contour as the base rotates. The blades are fixed radially to carriages on the ellipse perimeter. This configuration allows the blades to sweep a larger area as the base rotates, reducing dead zones and increasing efficiency. The pivoting blades also stabilize the flow and reduce noise compared to fixed blades. The elliptical shape further reduces wind resistance. The roller-guided base allows the blades to rotate and follow the ellipse contour.

Source

Wind energy device with multiple axes and blades to capture more wind power. The device has four rotor wheels arranged in a square with cables connecting opposite wheels. Airfoils rotate with the cables. The leading edge generates lift, the trailing edge generates downforce. This asymmetry balances forces for efficient rotation. Multiple generators are coupled to the wheels. The device can have adjustable pitch control to optimize performance based on wind speed. The blade shape, spacing, and geometry can be varied to maximize power output. The four-axis design allows better wind capture compared to single-axis turbines.

Source

Vertical wind turbine in which each blade's pitch motor also serves as the blade's only bearing and structural mount, eliminating the separate bearings, actuators, and fittings that conventional designs require. The blade is fixed directly onto the motor shaft, which is concentric with the blade's pivot axis, so the motor both carries the full blade load and rotates it to any pitch angle on demand. The rotor arm connecting each blade to the hub bolts onto the motor's outer housing, making the motor the single junction between blade, arm, and hub. Each blade is controlled independently throughout the rotor's rotation using cam disk profiles that supply a continuous target pitch angle for every rotor position, with different cam disks selected for different wind speeds. Running at lower tip speed ratios than conventional vertical turbines keeps blade tip speed down, reducing aerodynamic drag on the arms and rigging — losses that grow with the cube of tip speed.

Source

Vertical wind turbine with self-pivoting blades that automatically face flat into the wind to capture it, then rotate edge-on for the return stroke to cut drag — improving on fixed-blade designs that waste energy fighting the wind on the way back. Each blade can spin 90° about its own lengthwise axis. A fixed curved rail around the central shaft handles the switching passively: as the hub rotates and a blade reaches the return stroke, a small wheel at the blade's base rides up the rail and rotates the blade edge-on; once past the rail, the blade swings back flat to capture wind again. Built-in stops limit the pivot to 90° each way.

Source

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.

Source

An actuator for adjusting the pitch angle of a wind turbine rotor blade that eliminates lubrication and torque issues of conventional blade pitch actuators. The actuator is integrated into the large roller bearing of the blade hub. It uses an annular groove cylinder in one bearing ring and a piston that can move in the cylinder. The piston is connected to the other bearing ring. When pressurized, the piston moves in the cylinder and rotates both rings to adjust the blade pitch. This keeps the piston lever arm constant for consistent torque and has equal piston surfaces for independent direction force.

Source

Impeller for wind power generation with improved efficiency and reduced noise compared to conventional impellers. The impeller has blades that widen towards the outer edge, angled trailing edges, and partially overlapping leading/trailing edges on adjacent blades in the front view. This shape allows more wind capture, reduces vortex formation, and minimizes noise compared to traditional blades. The impeller is also designed for narrow wind tunnels to maximize power generation from limited areas. The wind tunnel shape avoids flow disturbance and allows high wind speeds.

Source

Vertical wind turbine with a dedicated pitch motor per blade that allows the turbine to operate at lower tip speed ratios than conventional designs, reducing aerodynamic drag on rotor arms and support structures that otherwise grows with the cube of rotor speed. In light winds, blade pitch is continuously adjusted so rotor speed tracks wind speed at a fixed tip speed ratio, keeping blades aerodynamically efficient across varying conditions. In strong winds, the rotor runs at a fixed speed and blade pitch compensates as wind speed varies instead. A cam disk provides a smooth, continuous pitch angle prescription for every point in a blade's circular path, with different cam disks selectable for different wind speeds. Wind sensors near each blade keep pitch positioning errors below 1.5°.

Source

Wind turbine rotor with an extra set of shorter blades mounted near the hub to improve energy capture at low-to-moderate wind speeds. Close to the hub, rotational speed is so low that the main blades cannot extract wind energy efficiently — and making them wide enough there to compensate is structurally and logistically impractical. The shorter blades are dedicated to this inner zone, covering only the region where the main blades fall short. Both blade sets can be individually pitch-adjusted, and the shorter blades are angularly offset from the main blades — by 60° on a three-blade rotor or 90° on a two-blade rotor.

Source

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.

Source

Wind turbine with self-aligning blade segments that passively orient themselves to the correct angle of attack, eliminating the need for expensive pre-twisted rigid blades. Each segment is a small airfoil threaded onto a cable stretched from the central hub to the outer rim, and a weathervane-style fin on each one swings it into the optimal pitch in response to wind. Because each airfoil moves independently, adjacent segments naturally settle at slightly different angles — producing the spanwise twist that conventional blades must be built with at great expense. The rim structure also lets the generator sit near the ground rather than atop the mast.

Source

Wind turbine pitch system that replaces the conventional gear drive with a pair of linear actuators that alternately grip and push a circular rail on the blade, eliminating the tooth wear caused by repetitive small-angle adjustments on the same gear teeth. For small pitch corrections, one actuator clamps the rail and pushes while the other stays released; for large pitch sweeps beyond a set angle, the roles switch. The two actuators are never allowed to clamp at the same time, which would otherwise lock the blade.

Source

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.

Source

Wind turbine that nearly doubles generator output without a gearbox by spinning the magnet carrier and coil carrier in opposite directions, so their relative speed is nearly twice the actual blade rotation speed. A compact diffuser ring mounted around the hub — not the blade tips — channels accelerated air to drive two turbine stages: one carries the main blades and magnets, the other carries the coils, and the two spin in opposite directions. The generator coils and magnets are embedded within the body of this diffuser ring. A nose inlet on the streamlined hub draws cooling air through an internal impeller to keep the generator from overheating. Short auxiliary blades near the hub, linked to the main blades via Y-shaped winglets, recover additional torque from the aerodynamically weak root region.

Source

Encased wind turbine design that improves efficiency by optimizing airflow through the turbine. The design involves an aerodynamic shroud around the rotor blades that encloses and directs the airflow. This shroud has a curved shape with a narrow inlet section that widens towards the outlet. The shroud also has aerofoil sections along the sides to further improve airflow. The enclosed airflow path helps capture more energy by reducing turbulence and losses. The shroud also reduces noise and vibrations. The encased design protects the blades and components inside from weather and debris.

Source

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.

Source

Wind turbine blade with small eddy generators placed right at the blunt trailing edge to break up the organized vortex shedding that causes drag and noise. Blunt trailing edges naturally shed alternating vortices in a repeating pattern that extracts energy from the airflow. The eddy generators introduce local surface irregularities within the last 30% of the chord — on the suction side, pressure side, or both — so the vortices form chaotically rather than in powerful alternating pairs. Unlike conventional vortex generators placed further upstream, these add no extra blade depth and impose no upstream drag penalty.

Source

VAWT with radially-oriented blades that generate lift through a greater portion of each rotation than conventional Savonius or Darrieus designs, which only extract useful energy on one side of their sweep. The blades point outward from the shaft like clock hands, so the convex face of each blade always faces the direction of rotation — generating lift on both the windward and leeward halves of the sweep. A curved shroud wraps around one side of the rotor, shielding the blades on their return sweep from oncoming wind while funneling airflow through the gaps between the shaft and the blades on the productive side.

Source

Wind turbine system that keeps blades spinning at a safe, steady speed in both low-wind and high-wind conditions, preventing the bearing damage caused by stopping and the danger of overspeeding. Each hollow blade has two fluid chambers — one at the tip and one near the hub — with a pump moving fluid between them. In weak or no wind, fluid is pumped toward the tip as that blade descends, adding weight to the descending side so gravity sustains rotation. In excessive wind, fluid is instead shifted to the tip of the ascending blade, opposing rotation and keeping speed below the 25 rpm safety limit. A shaft position sensor and anemometer tell the pump exactly when to act within each cycle. A heating element keeps the fluid from freezing in cold conditions.

Source

Wind turbine with blades that present their flat face to catch the wind during the productive half of each revolution, then pivot 90° edge-on to slice through it on the return, reducing the drag that limits fixed-blade turbines to roughly 30% wind energy capture. Each blade is attached to a sleeve that rotates around a fixed rod extending from the hub; tilting the sleeve pitches the blade between its two positions. In the mechanical version, a stationary cam ring engages each blade's gear at the right moment in the revolution to trigger the tilt, with stop posts locking the blade in each position. An automated version replaces the cam ring with motor-driven gears guided by a wind vane. A twin-turbine variant mounts two blade sets at opposite ends of the same shaft for greater output.

Source

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.

Source

Self-starting vertical axis turbine for wind or water that generates power even in slow-moving fluid. Helical blades on a central vertical shaft each have channels passing through them front-to-back; these channels use the venturi effect to accelerate slow fluid through the blade, increasing the rotational force available at low flow speeds. Each blade is built from horizontal sections stacked along the shaft, with each section rotated about 9° relative to the one below to produce the helical shape.

Source

Wind turbine with a built-in concentrator that funnels and accelerates surrounding airflow onto its rotor to extract more energy than free-stream wind alone allows. Two outer vertical wings act as deflectors, steering wind inward toward a central vertical wing that houses the generator. Adjustable curtains on V-shaped arms between the outer and central wings control how much air is channeled inward. The central wing collects this airflow through inlet openings on its rear face, and an internal diffuser then shoots it directly onto the rotor. The outer wings are flat on their inner faces to maximize inward deflection, while the central wing is drop-shaped to smoothly receive and redirect the flow. An electronic controller adjusts the curtains to match conditions.

Source

Rotor blade for vertical-axis wind or water turbines that generates more torque by compressing the fluid as it exits the blade, rather than allowing it to escape freely. The blade is scoop-shaped with a back wall sealing off its trailing edge, so fluid flowing into the concave face is compressed against that wall before escaping, pushing harder on the blade. The opening between the blade and the rotation axis is sized relative to the blade's enclosed volume — at a ratio of 1:2 to 1:4 — to control how much fluid enters and is compressed.

Source

Vertical-axis wind turbine (VAWT) that generates lift through nearly its full rotation, unlike conventional VAWTs where blades fight the wind through half of every turn. The blades are arranged like spokes pointing radially outward from the shaft and shaped as airfoils, so their curved face meets the wind at the correct angle to generate rotational lift on both the windward and leeward sides of the rotor. A stationary housing with a convex leeward face surrounds the rotor, blocking wind from reaching the blades where they would otherwise be pushed backward, while channeling it through on the productive side — including through gaps between the blade roots and the shaft for additional airflow. The assembly can yaw to track changing wind direction, and blades may be hinged to reduce drag when shielded.

Source

Fabric-skinned blade for Savonius (vertical-axis) wind turbines that reduces weight by cutting holes into a curved metal blade and covering them with a lightweight polymer fabric instead of solid metal, maintaining an aerodynamically complete surface at a fraction of the weight. A retractable roller attached to the fabric can pull it back to expose the holes, letting wind pass through the blade when needed.

Source

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.

Source

Enclosed vertical-axis wind turbine that sustains a low-pressure zone inside its casing, pulling air in from both the top and sides simultaneously to improve energy capture. Side wind spins vertical blades surrounding a central Venturi tube, converting it into a downward spiral; the tube's narrowing accelerates this spiraling air, dropping the internal pressure enough to also draw air in through the open top. A fan at the base of the same rotating blade assembly reinforces this low pressure by pulling air through the Venturi tube, while curved blades on the same assembly scatter the exiting air radially to prevent backpressure from building at the exit. This self-reinforcing cycle sustains the internal low pressure and allows the turbine to start spinning in light winds.

Source

Savonius wind turbine with wing-shaped blades that generate aerodynamic lift rather than simply catching wind like a cup, increasing rotor torque and reducing drag. Each blade has a flat inner section attached to the hub that leads outward into a curved scoop twisted progressively along its length — a hook-and-twist profile inspired by a raptor's wingtip. The angled scoop sections push the rotor forward more forcefully on the advancing side, while the curved outer face speeds up airflow to reduce drag on the retreating side. Optionally, the blade surface can be made from a shape-adaptive material — such as Nitinol or a metallic composite — that passively reshapes itself with changing wind strength to maintain the optimal profile without any mechanical actuators.

Source

Vertical-axis wind turbine (VAWT) with a scooping wind shield that recovers wind energy conventional shields simply waste. A VAWT needs a shield on its windward side to prevent oncoming wind from pushing the blades backward, but that intercepted wind is normally lost. Here, the shield is shaped as an outward-facing scoop that catches this wind, funnels it through an internal channel, and jets it out onto the driving face of the blades, generating additional torque. The shield is coupled to the central shaft so it can only rotate in one direction, keeping it automatically aligned as wind direction shifts. An optional side shield can further guide airflow around the blades.

Source