A biomimetic blade, impeller, and fan with a wave-like surface structure

Abstract

This invention discloses a biomimetic blade, impeller, and fan with a wave-like surface structure. The blade features a continuous wave structure along its chord length. The wave structure includes a first wave structure, a gentler wave structure, and a second wave structure arranged sequentially along the chord length. This invention targets a closed axial flow impeller, employing a wave-like biomimetic design on the blade surface. The wave pattern is primarily concentrated from 50% of the blade height to the blade tip, aiming to reduce noise from the blade tip to 50% of the blade height. During operation, the area with the highest sound pressure level is concentrated above 50% of the blade height to the blade tip, with the highest sound pressure level near the blade tip. The wave-like design at this location effectively improves the area of ​​airflow energy dissipation and accumulation, thereby reducing noise.

Description

Technical Field

[0001] This invention belongs to the field of wind turbine technology, specifically relating to a biomimetic blade, impeller, and wind turbine with a surface wave-like structure. Background Technology

[0002] A fan is a device for transporting gas, which includes a wind turbine, a guide ring, a support frame, and a motor. The wind turbine is equipped with multiple blades, the number of which can be adjusted according to actual use. However, the fan will generate some noise during use. To solve the noise problem, the existing technology uses blades with a wave-shaped structure to reduce noise. However, the noise reduction effect of this design is still not ideal. To solve the above technical problems, it is necessary to develop a biomimetic blade, impeller, and fan with a surface wave-shaped structure. Summary of the Invention

[0003] The purpose of this invention is to provide a biomimetic blade, impeller, and fan with a wave-like surface structure to solve the aforementioned technical problems. This invention targets a closed axial flow impeller, employing a wave-like biomimetic design on the blade surface. The wave pattern is mainly concentrated between 50% of the blade height (the distance from the blade root to the blade tip) and the blade tip position, primarily aimed at reducing noise from the blade tip to 50% of the blade height. During operation, the area with the highest noise sound pressure level is concentrated above 50% of the blade height to the blade tip, with the noise sound pressure level near the blade tip being relatively the highest. The wave-like design on the blade at this location effectively improves the area of ​​airflow energy dissipation and accumulation, thereby reducing noise.

[0004] To achieve the above-mentioned objectives, the technical solution adopted by the present invention is as follows:

[0005] A biomimetic blade with a surface wave-like structure, wherein the wave structure is continuously arranged along the chord length direction;

[0006] The wave structure includes a first wave structure, a gentle structure, and a second wave structure arranged sequentially along the chord length setting direction.

[0007] Preferably, along the chord length setting direction, the peak amplitude of the first wave structure to the gentle structure gradually decreases.

[0008] Preferably, the peak amplitude of the wave structure gradually increases from the gentle structure to the second wave structure along the chord length setting direction.

[0009] Preferably, the smooth structure is provided at 35% to 45% of the chord length along the direction from the leading edge to the trailing edge of the blade. Specifically, the smooth structure is provided at 40% of the chord length along the direction from the leading edge to the trailing edge of the blade.

[0010] Preferably, the relationship between the maximum wave crest height and the chord length is H / d = 0.04, where H is the wave crest and d is the maximum chord length; the relationship between the minimum wave crest height and the chord length is H / d = 0.001, where H is the wave crest and d is the maximum chord length; and the wavelength variation range of the wave structure satisfies the following relationship: λ / d = 0.05~0.2, where λ is the wavelength and d is the maximum chord length.

[0011] Preferably, the wave crest amplitude set on the pressure surface of the blade by the first wave structure is greater than the wave crest amplitude set on the suction surface of the blade.

[0012] Preferably, the relationship between the maximum crest and chord length of the pressure surface and suction surface of the second wave structure is in the range of H / d = 0.02 to 0.04, where H is the crest and d is the maximum chord length.

[0013] Preferably, the wave crest height of the smooth structure is set to H / d = 0.001, where H is the wave crest and d is the maximum chord length.

[0014] Preferably, both the first wave structure and the second wave structure have multiple wave peaks on the pressure surface and suction surface of the blade.

[0015] Preferably, the wave structure is provided within the range from the top of the blade to 50% to 60% of the blade height.

[0016] Preferably, the leading edge of the blade is provided with a first serrated structure, and the ratio of its peak to wavelength is in the range of H / λ = 0.1 to 5.

[0017] Preferably, the trailing edge of the blade is provided with a second serrated structure, and the ratio of its peak to wavelength is in the range of H / λ = 0.1 to 5.

[0018] An impeller, equipped with the aforementioned biomimetic blades. This impeller design uses a cover ring 8 connected to the outer circle of the blade 9 to form a closed structure. The cover ring 8 and the guide ring 2 are installed with a clearance fit. The impeller hub 3 adopts a tapered structure with a gradually increasing cross-section along the direction from the blade pressure surface to the blade suction surface. This structure gives the impeller meridional flow channel mixed flow characteristics, resulting in a relatively high pressure coefficient (relative to axial flow) and achieving the impeller's high static pressure (PQ) characteristics.

[0019] A fan equipped with the aforementioned impeller.

[0020] This application has achieved beneficial technical effects:

[0021] This invention targets a closed axial flow impeller, employing a wave-shaped biomimetic design on the blade surface. The wave pattern is primarily concentrated from 50% of the blade height to the blade tip, aiming to reduce noise in this area. During operation, the area with the highest noise sound pressure level is concentrated above 50% of the blade height to the blade tip, with the highest noise sound pressure level near the blade tip. The wave-shaped design in this area effectively improves the region of airflow energy dissipation and accumulation, thereby reducing noise. Attached Figure Description

[0022] Figure 1 The image shown is one of the schematic diagrams of the wind turbine assembly structure;

[0023] Figure 2 The second schematic diagram shows the assembly structure of the wind turbine;

[0024] Figure 3 The image shown is one of the structural schematic diagrams of a blade;

[0025] Figure 4 The second schematic diagram of the blade structure is shown.

[0026] Figure 5 As shown Figure 4 Schematic diagram of cross sections S1 to S5;

[0027] Figure 6 The diagram shows the peak H and wavelength λ.

[0028] Figure 7 The diagram shown is a cross-sectional view of the fan. Detailed Implementation

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0030] The technical solution of the present invention will be described in detail below with specific embodiments.

[0031] Reference Figures 1 to 7 As shown, in one embodiment of the present invention, a biomimetic blade with a surface wave-like structure is provided, wherein the wave structure is continuously arranged along the chord length direction.

[0032] The wave structure includes a first wave structure, a smooth structure, and a second wave structure arranged continuously along the chord length direction. The first wave structure is located near the leading edge of the blade at section S1; the first wave structure is located near the smooth structure at section S2; the second wave structure is located near the smooth structure at section S3; the middle position of the second wave structure is located at section S4; and the second wave structure is located near the trailing edge of the blade at section S5. The smooth structure is located between section S2 and section S3.

[0033] In one embodiment, along the chord length setting direction (i.e., from the leading edge to the trailing edge of the blade), the peak amplitude of the first wave structure to the smooth structure gradually decreases. Along the chord length setting direction, the peak amplitude of the smooth structure to the second wave structure gradually increases. The smooth structure is set at 40% chord length. Specifically, along the blade leading edge to the blade trailing edge, the smooth structure is set at 40% chord length. A cross-section is taken along the blade root to the blade tip, and sections S1, S2, S3, S4, and S5 are obtained according to different chord length positions. From the inlet (section S1) to the outlet (section S5), it can be seen that the wave shape has a relatively large peak amplitude on the inlet section S1, which gradually decreases, reaching its lowest point near approximately 40% chord length. From 40% chord length to the trailing edge, the peak amplitude gradually increases. The relationship between the maximum crest height and the chord length is H / d = 0.04, where H is the crest and d is the maximum chord length. The relationship between the minimum crest height and the chord length is H / d = 0.001, where H is the crest and d is the maximum chord length. The wavelength variation range of the wave structure satisfies the following relationship: λ / d = 0.05 to 0.2, where λ is the wavelength and d is the maximum chord length. This varying crest and trough structure causes the airflow to generate noise at different wavelengths when passing through these blade wall positions, thereby avoiding the superposition effect of the same wavelength and further reducing the noise value.

[0034] In one embodiment, the wave peak amplitude of the first wave structure on the pressure surface of the blade is greater than that on the suction surface. Near the blade inlet, the wave structure on the S1 cross-section is characterized by relatively larger pressure surface peaks and relatively smaller suction surface peaks. Specifically, at each corresponding position, the ratio of pressure surface to suction surface peaks ranges from Hs / Hp = 0.2 to 0.9, where Hs is the suction surface peak and Hp is the pressure surface peak. The ratio of pressure surface to suction surface wavelength ranges from λs / λp = 0.5 to 0.9, where λs is the suction surface wavelength and λp is the pressure surface wavelength. This structure effectively increases the inlet airflow angle of the wave peak spanwise cross-section (compared to no waves), which is beneficial for further increasing the flow rate when the airflow enters the blade channel. This structure makes the incoming airflow smoother and can effectively reduce the inlet noise when the gas enters the impeller.

[0035] In one embodiment, near the trailing edge of the blade, the wave structure on the S5 cross-section is characterized by relatively obvious peaks on both the pressure and suction surfaces, and the relationship between the maximum peak and the chord length is H / d = 0.02 to 0.04 (peak / chord length). This structure improves the matching between the airflow and the trailing edge wave structure, which helps to reduce aerodynamic noise near the trailing edge in the flow channel.

[0036] In one embodiment, both the first wave structure and the second wave structure have multiple wave peaks on the pressure surface and suction surface of the blade.

[0037] In one embodiment, the wave structure is set within the range from the blade tip to 50% of the blade height. For a closed axial flow impeller, a wave-shaped biomimetic design is adopted on the blade surface, with the wave shape mainly concentrated from 50% of the blade height to the blade tip. Its purpose is mainly to reduce the noise from the blade tip to 50% of the blade height. (1) When the impeller is working, the area with higher noise sound pressure intensity is mainly concentrated above 50% of the blade height to the blade tip, and the noise sound pressure intensity is relatively the highest near the blade tip; (2) The wave-shaped design of the blade at this position can effectively improve the area of ​​airflow energy dissipation and accumulation, thereby reducing noise.

[0038] In one embodiment, the leading edge of the blade is provided with a first serrated structure 11, the ratio of its crest to wavelength ranging from H / λ to 0.1 to 5. This coupling design with the inlet wave surface, i.e., a smooth transition with the inlet wave surface, can further reduce inlet noise.

[0039] In one embodiment, the trailing edge of the blade is provided with a second serrated structure 12, the ratio of its peak to wavelength ranging from H / λ to 0.1 to 5. This design, coupled with the wave-coupled design of the exit surface, allows for a smooth transition to the wave-like surface of the exit, further reducing exit noise.

[0040] In one embodiment, the wave crests set between the first wave structure and the flat structure, and the wave crests set between the flat structure and the second wave structure are offset from each other.

[0041] This invention also provides an impeller equipped with biomimetic blades as described above. This impeller design uses a cover ring 8 connected to the outer circle of the blade 9 to form a closed structure. The cover ring 8 and the guide ring 2 are installed with a clearance fit. The impeller hub 3 adopts a tapered structure with a gradually increasing cross-section along the direction from the blade pressure surface to the blade suction surface. This structure gives the impeller meridional channel mixed-flow characteristics, resulting in a relatively high pressure coefficient (relative to axial flow) and achieving high static pressure (PQ) characteristics for the impeller.

[0042] The present invention also provides a fan equipped with an impeller as described above. It mainly consists of a wind turbine 1, a guide ring 2, a support 6, and a motor 4. The wind turbine mainly includes a hub, blades, and a cover ring. The rotating part of the motor is bolted to the wind turbine, and the support is bolted to the motor base and the guide ring. The guide ring is fixed to the user mounting plate.

[0043] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0044] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

[0045] The embodiments of the biomimetic blade, impeller, and fan with a surface wave-like structure provided by the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention, and the descriptions of the embodiments above are only for the purpose of helping to understand the core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A biomimetic blade with a wavy surface structure, characterized in that, The blades are continuously provided with a wave structure along the chord length direction; The wave structure includes a first wave structure, a gentle structure, and a second wave structure arranged sequentially along the chord length setting direction; The peak amplitude of the waves gradually decreases from the first wave structure to the gentler structure. The peak amplitude of the wave pattern gradually increases from the gentle structure to the second wave structure along the chord length setting direction; Along the direction from the leading edge to the trailing edge of the blade, the gentle structure is provided at 35% to 45% of the chord length; The relationship between the maximum crest height and the chord length is: H / d = 0.04 (H is the crest height, d is the maximum chord length); the minimum crest height is H / d = 0.001 (H is the crest height, d is the maximum chord length); and the wavelength variation range of the wave structure satisfies the following relationship: λ / d = 0.05~0.2 (λ is the wavelength, d is the maximum chord length).

2. The biomimetic blade according to claim 1, characterized in that, Along the chord length setting direction, the wave crests set between the first wave structure and the flat structure, and the wave crests set between the flat structure and the second wave structure are misaligned with each other.

3. The biomimetic blade according to claim 2, characterized in that, The wave peak amplitude set by the first wave structure on the pressure surface of the blade is greater than the wave peak amplitude set on the suction surface of the blade. The relationship between the maximum crest and chord length of the pressure and suction surfaces of the second wave structure is: H / d = 0.02 to 0.04, where H is the crest and d is the maximum chord length.

4. The biomimetic blade according to claim 1, characterized in that, The wave crest height of the smooth structure is set to H / d=0.001, where H is the wave crest and d is the maximum chord length.

5. The biomimetic blade according to claim 1, characterized in that, The wave structure is set from the top of the blade to 50% to 60% of the blade height.

6. The biomimetic blade according to claim 1, characterized in that, The leading edge of the blade is provided with a first serrated structure, and the ratio of its peak to wavelength ranges from H / λ to 0.1 to 5. The trailing edge of the blade is provided with a second serrated structure, and the ratio of its peak to wavelength ranges from H / λ to 0.1 to 5.

7. An impeller, characterized in that, Assemble the biomimetic blade as described in any one of claims 1 to 6.

8. A fan, characterized in that, Assemble the impeller as described in claim 7.

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