Biomimetic Blades for Wind Turbine Noise Control

Bionic wind turbine blade design that reduces noise without sacrificing aerodynamic performance. The blade has a non-smooth leading edge and a curved sawtooth trailing edge, especially at the middle to end sections of the blade. This bionic shape inspired by owl wings and feathers aims to significantly reduce aerodynamic noise generated by wind turbine blades while maintaining aerodynamic efficiency. The non-smooth leading edge and curved serrated trailing edge are applied to the noise source areas near the blade mid-span.

Source

Wind turbine blade design to reduce vibrations and improve efficiency by borrowing from nature. The blade has a bionic airfoil shape based on a cuckoo wing cross-section, and a V-shaped stripe pattern on the web surface inspired by cuckoo feathers. This coupled design suppresses blade flutter and reduces vibration displacement. The bionic airfoil improves lift and reduces drag, while the V-shaped stripes absorb vibration energy and hinder deformation. It allows higher loads and improves blade life.

Source

Blade design for wind turbine blades that reduces noise compared to conventional blade shapes. The blade has a profile inspired by the wings of long-eared cuckoos. The blade has a lower convex curve and an upper concave curve. This shape guides airflow into the concave section which throws it out, reducing unstable circulation and noise. The cuckoo wing-inspired blade design was found to significantly reduce noise compared to conventional blade shapes through numerical simulation and experimental testing.

Source

Bionic wind turbine blade design inspired by shark fins to improve aerodynamic performance. The blade has a line flap resembling a shark's fin at the trailing edge. The flap width is 0.2% of the blade chord length and height is 2% of the chord length. This bionic feature increases lift by enhancing the pressure differential between the blade suction and pressure surfaces. It improves blade performance without significant drag increase.

Source

A bionic design for wind turbine blades that improves lift force and aerodynamic performance with reduced drag compared to conventional blades. The bionic design adds an arc-shaped fin flap to the trailing edge of the blade inspired by shark tails. The fin tapers gradually from the front to the back and has a streamlined shape. This fin profile increases the pressure difference between the suction and pressure surfaces, boosting lift force without significantly increasing drag.

Source

Bionic wind turbine blade design to reduce noise and improve durability. The blades have a unique shape with curved sections joined at tapered ends. The curved sections form an arc transition between larger and smaller planes. Multiple curved sections are stacked perpendicularly to form the blade. Wings are attached to the blade surface. This bionic blade shape reduces noise by reducing pressure pulsations on the blade surface. The tapered ends and curved sections also improve durability by reducing stress concentrations. The wings further reduce noise by altering the flow over the blade.

Source

Bionic blade design for wind turbines that reduces aerodynamic noise compared to conventional blades. The blade has a non-smooth leading edge shape with features like sawtooths, bumps, and concave points. This bionic leading edge structure helps rectify the airflow velocity distribution on the blade surface, reducing pressure pulsations and separations that cause noise. The irregular edge induces vortex generation to control separation and stability. It aims to uniformize airflow over the blade and mitigate wake turbulence at the trailing edge.

Source

A blade design for cross-flow wind wheels that reduces noise compared to conventional blades. The blades have a non-symmetric shape with a thicker middle section and narrower sides. This asymmetric profile reduces eddy currents and vortices that generate noise. The blade shape is designed based on reference distances and heights to optimize the noise reduction.

Source

Retrofitting wind turbine blades with bionic aerodynamic shrapnel to improve blade performance and delay stall. The shrapnel is shaped like a whale tail fin and attaches to the blade suction surface between 50-70% of the chord length. The shrapnel angle is 22-45 degrees to the blade contour. Its length in the chord direction is 10-13% of the chord. The shrapnel bounces at high angles to prevent separation, but doesn't disrupt flow at low angles.

Source

Wind turbine blade with trailing edge serrations that reduce noise and improve aerodynamics. The blade has serrations along the trailing edge with flow alignment vanes positioned apart from the notional line connecting the serration base to apex. The vanes align flow towards the notional line to reduce trailing edge vortices and noise. The serrations protrude into the wake, continuing the flow alignment effect after the air leaves the serrated surface. The vanes are preferably plastic to match the blade material. The blade can have a profiled contour with a bead between the trailing edge and leading edge. The serrated panel can attach to the blade edge.

Source

High speed wind turbine blade design to reduce noise levels when the turbine rotates at high speed. The blade shape is optimized with swept and unhedral curves on the leading and trailing edges to create a low noise airflow around the blade tips. This reduces noise compared to conventional blade shapes by naturally guiding the airflow along the curved surfaces instead of causing turbulence and noise impacts. The swept and unhedral curves aim to minimize low frequency noise absorption and maximize high frequency noise dissipation.

Source

Bionic trailing edge wind turbine blade design to reduce noise and vibrations. The design involves adding a whale tail fin-shaped flap at the base airfoil blade trailing edge that can be adjusted based on the separation point position. The flap is symmetrically distributed on both sides of the blade suction surface and pressure surface. This bionic trailing edge modification mimics the shape of whale tails and aims to reduce noise and vibrations during wind turbine operation.

Source

A bionic axial flow wind wheel with blades inspired by bird wings to improve efficiency and reduce noise compared to traditional wind wheels. The blades have a deflected portion near the tips that extends from where the blade deflects to the tip. The deflected portion angles away from the pressure surface. This bionic design mimics the bird wing leading edge curve and tip deflection. It improves flow state between the blade and collector, reducing separation and vortices. The deflected portion reduces noise by concentrating flow and preventing separation.

Source

Axial fan blade design that reduces power consumption and noise compared to conventional blades. The blade trailing edge is modified using bionic features inspired by fish tails and bird wings. The modification involves a V-shaped concave section with an angle of 145-175 degrees cut into the blade. Further away from the blade hub, a zigzag sawtooth section like a bird's wing is added. This bionic profile reduces tip leakage flow and wake compared to a straight trailing edge. The blade design improves load distribution, reduces power, and noise.

Source

Wind turbine blade tip design with double winglets to improve aerodynamic performance and reduce noise. The blade tip has a Y-shaped winglet with a curved-swept leading edge and concave trailing edge. The winglet has an air termination device connected to the lightning arrester. This design reduces tip loss, improves blade efficiency, and changes airflow distribution to reduce noise compared to conventional blade tips.

Source

Bionic leading edge wind power blade design to improve aerodynamics and reduce noise compared to traditional blades. The blade has a sinusoidally varying convex leading edge shape that is periodically distributed along the blade. This bionic leading edge geometry promotes boundary layer attachment, reduces separation, and improves performance over the entire blade span. The convex shape is optimized through testing and design to balance aerodynamics and noise reduction.

Source

Wind turbine blade design that improves efficiency by combining a biological airfoil inspired by cuckoo wings with herringbone grooves. The bionic blade shape is reconstructed from cuckoo wing cross-sections. Then herringbone grooves are designed based on the reconstructed blade. This coupling increases pressure difference between the blade surfaces, boosting efficiency. The biological airfoil and herringbone blade design enhances wind turbine power generation compared to conventional blades.

Source

A low-noise wind turbine blade design inspired by bird wings to reduce aerodynamic noise while maintaining performance. The blade has a bionic airfoil shape and a sawtooth trailing edge. The bionic airfoil mimics bird wing shapes for efficient lift and reduced drag. The sawtooth trailing edge reduces turbulence and noise compared to a conventional straight edge. This bionic blade design aims to solve the tradeoff between noise reduction and aerodynamic performance in wind turbine blades.

Source

A wind turbine blade tip winglet design that improves blade performance, reduces drag, and noise compared to conventional winglets. The winglet has a wavy leading edge starting from a plane along the blade span. This transition helps mitigate tip vortex issues by changing the airflow near the blade tip. The smooth trailing edge and coinciding trailing edges with the blade ensure compatibility. The wavy leading edge is prepared by modifying an existing winglet airfoil starting from a plane along the blade span.

Source

Bionic blade design for wind turbines that reduces noise and improves efficiency. The blade has a unique shape formed by stacked iron-shaped line units. The blade body is made of these units arranged perpendicular to the blade length. Each unit has curved sides with parallel ends connected by a circular arc. The smaller end is the symmetry plane. This shape reduces airflow impact and stall. The blade also has multiple rows of wings along its length and a trailing edge brush. These features improve wake flow, reduce noise, and enhance efficiency compared to conventional blades.

Source

Reducing broadband noise of turbomachinery impellers by modifying the blade trailing edge shape. The modification involves adding a periodic sawtooth structure along the trailing edge of the blade. The sawtooth extends from the base of the trailing edge. This bionic design mimics the trailing edge serrations found on the wings of silent flying owls. The sawtooth structure reduces broadband noise compared to a smooth trailing edge.

Source

Extenders at the trailing edge of aerodynamic profiles, like wind turbine blades, to reduce noise and potentially improve efficiency. The extenders have serrated teeth shapes that can be attached to the trailing edges of aerodynamic profiles like wind turbine blades. The serrated shape aims to reduce noise by changing the aerodynamics at the trailing edge without significantly increasing drag or lift coefficients.

Source

Wind turbine blade and attachment device with sawtooth serrations along the trailing edge that prevent tonal noise without affecting aerodynamics. The serrations have peaks and valleys that alternately extend into the blade thickness. The cross section along the blade cord remains a blade shape throughout, avoiding steep discontinuities. This sawtooth profile prevents alternating vortices and tonal noise compared to flat serrations. The wind turbine wing attachment device has sawtooth serrations on the first surface of the wing trailing edge that connect to wall surfaces on the blade.

Source

Bionic axial flow wind wheel design that improves efficiency and reduces noise compared to conventional wind wheels. The bionic design takes inspiration from bird wings. The blade has a deflected portion near the tip that angles away from the blade pressure surface. This deflection reduces separation and flow separation noise. The blade also has a continuous convex structure on the trailing edge that converges the flow. This reduces eddy currents and noise. The blade profile has a maximum thickness near the leading edge to further reduce flow resistance.

Source

Bionic blade design for horizontal axis wind turbines that improves efficiency by mimicking the aerodynamics of bird wings. The blade has a V-shaped groove on the suction surface, modeled after the wing structure of cuckoos. The groove size is determined by geometric similarity based on the bird wing dimensions. The groove is 38% the blade length, 18% from the leading edge, and 20mm spacing between adjacent grooves at the trailing edge. The V-shaped grooves on the blade mimic the vortex generating wing features of cuckoos to improve aerodynamics and reduce turbulence.

Source

Bionic wind turbine blade design inspired by the wings of cuckoo birds. The blade has a non-smooth leading edge with jagged protrusions like cuckoo feathers, as well as a cross-sectional airfoil shape based on cuckoo wings. This bionic blade design aims to improve wind energy conversion efficiency and power generation compared to standard wind turbine blades. The jagged leading edge and unique airfoil shape are inspired by cuckoo bird wings which have been evolved to capture more airflow and reduce drag.

Source

Wind turbine blade design to reduce noise and improve durability. The blade has a sound-absorbing cotton covering on the outside, an impeller drum at the top, a bearing inside, brushes on the blade trailing edge, and a support plate attaching the blade to the tower. The bearing and blade ends are sleeved, the bearing inner wall is longer, and the blade end has bumps. The support plate connects the blade and bearing walls. The brushes, bumps, and sleeve contacts prevent blade separation. The cotton reduces noise. The support plate strengthens the blade and adjusts blade shape.

Source

Reducing tonality in wind turbine noise by thickening the blade trailing edge in a specific area. The blade has a local maximum thickness at the trailing edge between root and tip. This increases the blade's acoustic absorption in that frequency range, masking tonality peaks and reducing overall perceived noise annoyance.

Source

Blade design for wind turbine blades that reduces noise compared to conventional blade shapes. The blade has a lower convex surface followed by an upper concave surface. This configuration guides the airflow to avoid unstable circulation and throws it out, reducing noise. The convex lower surface guides the airflow into the concave upper surface, which throws it out. This prevents airflow instability and improves airflow efficiency.

Source

Noise reducers for wind turbine rotor blades having serrated edges to mitigate noise generation. The noise reducers have serrations with features that reduce vortices and noise compared to conventional serrated edges. The serrations have bases that attach to the blade trailing edge and side edges that extend out of the base plane. This configuration reduces vortices formed at the serration edges that can generate noise. The base plane can be parallel to the blade surface or angled slightly. The side edge extension prevents vortex formation and noise generation at the serration edges.

Source

Reducing noise generated by wind turbine blades, particularly at low wind speeds, by modifying the blade's trailing edge shape. The invention involves adding a curved trailing edge correction section to the blade that extends beyond the conventional straight trailing edge. This curved section has a shape that reduces noise by changing the flow separation and vortex shedding behavior at low wind speeds. The curved trailing edge correction section mitigates the noise-generating effects of flow separation and vortex shedding that occur at low wind speeds when the blade is not fully loaded. The curved section is designed to smoothly transition the flow from the blade's airfoil section to the free stream, preventing premature flow separation and reducing the formation of noise-generating vortices.

Source

Blade design for wind turbine blades that reduces noise compared to conventional blades. The blade has a unique shape with a convex lower surface and concave upper surface. The concave upper surface throws out the airflow, preventing unstable circulation and noise. The convex lower surface guides the airflow into the concave upper surface. This throws out the airflow, preventing unstable circulation and noise. The blade shape improves airflow efficiency while reducing noise compared to traditional blade shapes.

Source

Blade design for wind turbines that reduces noise compared to conventional blades. The blade has a unique shape with a lower convex surface followed by an upper concave surface. The convex lower surface guides the airflow and the concave upper surface throws it out, reducing unstable circulation and noise. The convex lower surface is shorter than the concave upper surface. The blade extends from the inlet to the outlet of the turbine. The blade shape is based on analyzing the mid-curve of a long-eared cuckoo wing, which has low noise characteristics.

Source

Wind turbine rotor blade with serrated trailing edge to reduce noise and improve efficiency. The trailing edge has a plurality of serrations with angled bisectors. The bisector angle is between 70-110 degrees to the tangent of the blade trailing edge line. This geometry helps align the flow vector at the serration tips better than a flat trailing edge. It reduces noise compared to serrations perpendicular to the trailing edge. The unequal serration lengths and angled bisectors further optimize the flow.

Source

Vertical axis wind turbine with optimized blade design to reduce noise, improve efficiency, and prevent stalling in fluctuating wind. The blade has a main wing portion parallel to the vertical shaft and winglets extending obliquely toward the shaft. The blade thickness increases radially near the front end. The winglets bulge outward radially and taper inward toward the tips. The blade width narrows toward the sides. The winglet apex position is between 50% and 83% of blade width. This blade shape reduces vortex formation, noise, and stalling compared to conventional vertical axis blades.

Source

Reducing trailing edge noise in wind turbine blades by adding wedge-shaped elements at the blade tip to alter the flow separation and vortex shedding behind the blade trailing edge. The wedges reduce trailing edge noise without significantly impacting blade aerodynamics. They increase the trailing edge solid angle, moving the intersection point of pressure and suction flows closer to the trailing edge, which reduces the wake distance behind the trailing edge where vortex patterns form. The wedges can be attached as add-ons to existing blades or incorporated into new blades during manufacture.

Source

Wind turbine blade design with integrated noise reduction features. The blade has protruding flow-regulating elements at the trailing edge and a movable fluid ejection device. The elements reduce noise by regulating airflow at the trailing edge. The ejection device injects fluid against the blade's incoming airflow to absorb turbulent energy and reduce noise. It can be adjusted to balance noise reduction with aerodynamic performance.

Source

Wind turbine blades with serrated tips and wind turbines using them to reduce noise and improve efficiency. The serrated blade tip design involves adding teeth along the trailing edge. This alters the flow separation and vortex formation at the tip, reducing noise and vortex shedding compared to a smooth tip. The serrated blade tips can be retrofitted to existing blades or incorporated into new blade designs. The serrated blades are used in wind turbines to provide quieter operation and better energy extraction.

Source

Wind turbine blade design to reduce noise compared to conventional wind turbine blades. The blade has a rectangular wing at the end instead of a natural end. The length of the wing is 2-4 times the width of the blade body at the transition, and the width is 0.5-1 times the wing length. This design prevents vortex formation and noise generation at the blade tip like conventional blades do.

Source

Wind turbine blade design with reduced trailing edge noise compared to conventional blades. The blade has serrated teeth along the trailing edge that contain openings. The serrations break up the airflow and reduce turbulence and noise. The openings in the teeth also prevent flapping and damage during pitch changes. The serrations and openings are arranged in sets on the blunt trailing edge.

Source

Wind turbine rotor blade design with reduced noise and improved airflow at the blade tip. The blade tip is angled towards the pressure side and has serrations on the trailing edge. The serration geometry is calculated based on the trailing edge contour. The serrations have unequal edge lengths, non-parallel edges, and bisectors angled 70-110 degrees to the tangent. This improves flow behavior and reduces noise compared to straight trailing edges.

Source

A noise reducing fence on wind turbine blades upstream of the trailing edge to further reduce blade noise. The fence has structures that extend into the boundary layer of airflow upstream of the trailing edge. This modifies the airflow to reduce acoustic emissions when turbulent eddies from the boundary layer interact with the trailing edge. It complements or replaces trailing edge modifications like serrated teeth to reduce blade noise.

Source

Megawatt class wind turbine blade design with a tip spoiler structure to reduce induced resistance, vortex generation, and noise. The blade tip is modified with a spike-like protrusion that extends upwards and bends backward. This spoiler structure generates a counter-rotating vortex integrally with the blade body near the tip. It diffuses vertically to reduce the larger velocity component of the vortex near the center. This delays airflow separation, reduces tip vortex strength, and improves blade aerodynamics.

Source

A blunt trailing edge noise reduction device for wind turbine blades to significantly reduce aerodynamic noise. The device involves adding a serrated trailing edge body onto the blunt trailing edge of the airfoil section. The serrated body has upper and lower serrated parts connected to a fixed plate. This prevents large trailing edge shedding vortices that generate noise. The serrations break up the shedding vortices into smaller ones, reducing noise. The serration lengths and angles are optimized for noise reduction while maintaining strength.

Source

A trailing edge design for wind turbine blades that reduces noise and improves performance without increasing complexity. The trailing edge has serrations called "spikes" that improve flow behavior. The spike geometry is calculated based on the blade's trailing edge shape. The spikes are oriented differently at different blade lengths due to the curved trailing edge. By optimizing the spike angles for each location, it reduces vortices and noise compared to uniform spike orientation.

Source

Wind turbine blade with a serrated trailing edge to reduce noise. The blade has a serrated trailing edge with stiffening ribs to reduce noise compared to a smooth trailing edge. The serrated trailing edge helps break up and disperse the turbulent boundary layer airflow over the blade tip, reducing noise compared to a smooth trailing edge. The stiffening ribs provide structure to the serrated edge and prevent excessive deformation under load. This allows the blade to operate efficiently while reducing noise levels.

Source

Reducing noise from wind turbine blades by using serrated trailing edges with modified serration shape and angle. The serrations have angles of 75-90 degrees with the trailing edge, compared to conventional 45-55 degrees. This helps reduce noise by having serration edges almost parallel to the airflow. The serration length is 15-25% of the blade chord.

Source

Reducing noise generated by wind turbine blades, especially at the trailing edge, by adding serrations and internal ridges. The blade has a serrated extension attached to the trailing edge with teeth. Internal ridges, shaped like ridges, guide the airflow from the leading edge to the serrations. This deflects the flow to reduce noise generation at the trailing edge. The ridges can be integrated into the blade during manufacturing.

Source

Reducing noise generated by wind turbine blades, particularly at the trailing edge, by adding a serrated extension with teeth and a ridge-shaped patterning element. The teeth on the extension deflect the flow away from the blade, reducing pressure buildup and noise. The ridge-shaped patterning element guides the flow from the leading edge to the teeth, further reducing noise by avoiding flow separation and turbulence.

Source

Blade design for wind turbines that reduces noise compared to conventional blades, especially at high wind speeds. The blade has a device with alternating protruding and notched sections at the trailing edge. The protruding sections are short, thin, and arc-shaped. This configuration suppresses vortex shedding and pressure fluctuations that generate wideband noise and tonal noise. The short protrusions prevent vortex growth and spread compared to long protrusions. The thin tips reduce pressure differences. The arc shape further reduces pressure peaks.

Source