Impeller blade based on caudal fin fish scale bionic structure and impeller with same

Abstract

This invention discloses an impeller blade based on a caudal fin scale biomimetic structure and an impeller having the same. The impeller blade based on the caudal fin scale biomimetic structure includes a blade body with a leading edge and a trailing edge. The trailing edge has a widened section at the end away from the leading edge, the width of which gradually increases from the leading edge to the trailing edge. The trailing edge has multiple grooves arranged sequentially along its width direction to give the trailing edge a caudal fin scale biomimetic structure. The impeller blade based on the caudal fin scale biomimetic structure proposed in this invention can achieve flow control based on the biomimetic surface structure, improve the fluid flow characteristics at the trailing edge of the blade, promote a smooth transition of fluid at the trailing edge, reduce vortex shedding, and reduce flow resistance, effectively reducing noise during the operation of the impeller pump.

Description

Technical Field

[0001] This invention belongs to the field of fluid machinery technology, specifically relating to an impeller blade based on a tail fin scale biomimetic structure and an impeller having the same structure. Background Technology

[0002] As human exploration of nature deepens, biomimetic structural drag reduction and noise reduction technology has rapidly developed and been widely applied. Among these, fish, due to their speed and stealth in water, have become an important research subject in biomimetic drag reduction and noise reduction. The caudal fin structure has evolved over a long period, forming a highly optimized morphology to adapt to complex aquatic environments. The caudal fin not only possesses excellent propulsion performance but also effectively reduces water flow resistance and improves swimming efficiency. The shape variations of the caudal fin scales and surface textures play a crucial role in its flow control in water.

[0003] In related technologies, the blades experience high flow resistance and generate significant noise as they rotate with the impeller, resulting in poor fluid flow performance. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in the related art.

[0005] Therefore, embodiments of the present invention propose an impeller blade based on a tail fin scale biomimetic structure that can improve the fluid flow characteristics of the blade trailing edge.

[0006] An embodiment of the present invention also proposes an impeller.

[0007] The impeller blade based on the biomimetic structure of fish scales in the tail fin of this invention includes a blade body, wherein the blade body has a leading edge and a trailing edge.

[0008] The rear edge portion has a widening section at the end away from the front edge portion. The width of the widening section gradually increases in the direction from the front edge portion to the rear edge portion. The rear edge portion has multiple grooves arranged sequentially along its width direction to make the rear edge portion have a tail fin scale biomimetic structure.

[0009] The impeller blade based on the tail fin scale biomimetic structure proposed in this invention can achieve flow control based on the biomimetic surface structure, improve the fluid flow characteristics at the trailing edge of the blade, promote the smooth transition of fluid at the trailing edge, reduce vortex shedding, reduce flow resistance, and effectively reduce the noise during the operation of the impeller pump.

[0010] In some embodiments, the widened section has two sides that are sinusoidal in the width direction.

[0011] In some embodiments, the width dimension b of the extended segment sinThe variation in the length direction of the trailing edge satisfies:

[0012]

[0013] in, b0 is the minimum width dimension of the end of the widened section closest to the leading edge.

[0014] In some embodiments, the maximum width dimension b of the extended section sin1 The length of the widened section is 0.15b0 to 0.3b0, which is between 1.15b0 and 1.35b0.

[0015] In some embodiments, the depth of the trench gradually increases along the direction from the leading edge to the trailing edge.

[0016] In some embodiments, the plurality of grooves are constructed as sinusoidal grooves that conform to a sinusoidal curve.

[0017] In some embodiments, the maximum groove depth of the sinusoidal groove is A, and the sinusoidal groove follows a sinusoidal curve that satisfies:

[0018] A = (0.3~0.6)δ;

[0019] λ = 0.15b0 ~ 0.3b0;

[0020] Where A is the amplitude of the sine curve to which the sinusoidal groove follows, δ is the thickness of the trailing edge, λ is the wavelength of the sine curve to which the sinusoidal groove follows, and b0 is the minimum width dimension of the end of the widened section near the leading edge.

[0021] In some embodiments, the groove depth at the end of the groove away from the leading edge is A, and the groove depth gradually decreases to zero from the end away from the leading edge to the end closer to the leading edge.

[0022] And / or, the groove is configured to be arranged at the trailing edge along the tangential direction of rotation of the blade body;

[0023] And / or, one end of the groove extends to the rear edge portion near the front edge portion, and the other end of the groove extends to the rear edge portion away from the front edge portion.

[0024] In some embodiments, the groove is located at the trailing edge of the suction side of the blade body;

[0025] And / or, the length of the trailing edge is 10% to 15% of the total length of the blade body.

[0026] The impeller of this invention includes the impeller blades based on the tail fin scale biomimetic structure described in any of the above embodiments. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of an impeller blade based on a tail fin scale biomimetic structure according to an embodiment of the present invention.

[0028] Figure 2 This is a schematic diagram of the prototype impeller blades.

[0029] Figure 3 This is a schematic diagram of an impeller blade based on a tail fin scale biomimetic structure, according to another embodiment of the present invention.

[0030] Figure 4 This is a three-dimensional view of the trailing edge of an impeller blade based on a tail fin-scale biomimetic structure, according to an embodiment of the present invention.

[0031] Figure label:

[0032] 100. Impeller blades;

[0033] 1. Blade body; 11. Leading edge of blade; 12. Trailing edge of blade; 13. Tip of blade; 14. Root of blade; 15. Suction surface; 16. Pressure surface;

[0034] 2. Leading edge;

[0035] 3. Trailing edge; 31. Widened section; 32. Groove. Detailed Implementation

[0036] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0037] like Figure 1 As shown, the impeller blade 100 based on the biomimetic structure of a caudal fin scale in this embodiment of the invention includes a blade body 1, which has a leading edge portion 2 and a trailing edge portion 3. It should be understood that the blade body 1 has a suction surface 15 and a pressure surface 16 arranged opposite to each other. The suction surface 15 and the pressure surface 16 of the blade body 1 have a leading edge 11, a trailing edge 12, a tip 13 and a root 14 in the circumferential direction. The leading edge portion 2 is close to the leading edge 11 of the blade body 1, and the trailing edge portion 3 is close to the trailing edge 12 of the blade body 1.

[0038] The rear edge 3 has a widening section 31 at the end away from the front edge 2. The width of the widening section 31 gradually increases in the direction from the front edge 2 to the rear edge 3. That is, a section of the rear edge 3 is constructed as a section with a gradually increasing lateral width to simulate the width change of the caudal fin. At the same time, the rear edge 3 has multiple grooves 32 arranged sequentially along its width direction. Protrusions are formed between adjacent grooves 32. By arranging multiple grooves 32 in a certain pattern in the rear edge 3, the fin rays in the caudal fin can be simulated, so that the rear edge 3 has a caudal fin scale biomimetic structure.

[0039] This invention draws inspiration from the shape and surface texture of the main fin rays of a caudal fin scale. The lateral widening of the blade body 1 is optimized and multiple longitudinal grooves are set to simulate the shape of a caudal fin scale. The caudal fin scale biomimetic structure of this invention is arranged along the flow channel at the position of the blade trailing edge to form a biomimetic blade trailing edge with a flow guiding function.

[0040] In applications, the biomimetic structure of the tail fin scales can improve the characteristics of fluid flow, promote a smooth transition of fluid at the tail edge, reduce vortex shedding, and reduce flow resistance. It can effectively reduce noise during the operation of the vane pump and suppress impeller pressure pulsation during impeller rotation, thereby improving impeller performance.

[0041] Furthermore, the width direction mentioned in the embodiments of the present invention is... Figure 1 The width dimension shown refers to the dimension along the width direction shown in the figure.

[0042] In some embodiments, both sides of the widened section 31 are sinusoidal in width direction, and both sides of the widened section 31 extend outward relative to the blade body 1 to increase the width dimension of the widened section 31. To further optimize the biomimetic morphology and improve the performance of fluid flow control, in this embodiment of the invention, the width dimension of the widened section 31 varies along its length direction according to a sinusoidal curve, while also ensuring that the sides of the widened section 31 along its width direction are sinusoidal.

[0043] Optionally, the widening section 31 is arranged symmetrically in its width direction, that is, the trailing edge 3 of the blade body extends outward on both sides in its width direction, so that the shape of the trailing edge 3 is more in line with the shape of the tail fin.

[0044] Furthermore, the width dimension b of the extended section 31 sin The variation in the length direction of the trailing edge 3 satisfies:

[0045]

[0046] in, b0 is the width dimension of the extended section 31 near the leading edge 2.

[0047] The length direction mentioned in the embodiments of the present invention is Figure 1 The length direction shown has a length dimension of Figure 1 The dimensions along the length direction are shown.

[0048] Wherein, the maximum width dimension b of the extended segment in the embodiment of the present invention sin1 The length of the widened section is 0.15b0 to 0.3b0, ranging from 1.15b0 to 1.35b0.

[0049] Specifically, the maximum width dimension b of the extended section 31 sin1 The maximum width of the broadening section 31 can be 1.15b0, 1.17b0, 1.19b0, 1.2b0, 1.25b0, 1.3b0, or 1.35b0. When the maximum width of the broadening section 31 is too small and less than 1.15b0, the change in fluid flow characteristics is small and it is not easy to produce a significant effect. When the maximum width of the broadening section 31 is too large and less than 1.35b0, it is easy to cause the trailing edge to be too large, affecting the overall size and structure of the blade and impacting the overall performance of the blade. This embodiment of the invention, by reasonably controlling the maximum width range of the broadening section, can better optimize and improve the blade performance and enhance the overall performance of the blade.

[0050] The length of the widening section 31 is 0.15b0, 0.17b0, 0.2b0, 0.22b0, 0.245b0, 0.25b0, 0.27b0, or 0.3b0. When the length of the widening section 31 is less than 0.15b0, the proportion of the widening section to the total length of the blade body is too small, and the ability to control the flow direction of the fluid is weak. When the maximum and minimum width dimensions of the widening section are fixed, the aspect ratio of the widening section is too small. When the length of the widening section 31 is greater than 0.3b0, the aspect ratio of the widening section is relatively large. Neither of these conditions makes it easy to effectively optimize and regulate the airflow at the trailing edge.

[0051] The embodiments of the present invention can improve the optimization effect of the trailing edge fluid flow characteristics of the blade body by reasonably constraining the maximum width and length of the extension section, while simulating the biomimetic structure of the tail fin scales, and combining it with the structure of the blade body itself and the fluid characteristics in actual applications.

[0052] To be like Figure 2 The prototype impeller blades shown have been improved as follows: Figure 1Taking the impeller blade 100 based on the tail fin fish scale biomimetic structure as an example, the prototype impeller has 3 to 20 blades, the thickness of the trailing edge of the prototype impeller blade is δ = 1 to 8 mm, and the width of the trailing edge of the prototype impeller blade is b0 = 10 to 20 mm. By improving the trailing edge 3 with the tail fin fish scale biomimetic structure, the fluid flow characteristics of the trailing edge of the blade are optimized.

[0053] Specifically, with Figure 1 As shown, the length direction is taken as the X direction and the width direction as the Z direction to construct as follows. Figure 3 The planar rectangular coordinate system XZ is shown. On the XZ plane, with the prototype impeller blade length L1 and the prototype impeller blade trailing edge width b0 as references, the blade body 1 is widened starting from the initial position. Here, the initial position is L = L1 - 0.2b0, and the width dimension b of the trailing edge 3 (that is, the end of the widened section 31 near the leading edge 2) at the initial position is... sin0 The value is b0; taking the trailing edge width b0 of the prototype impeller blade as a reference, at the trailing edge 12L = L1 position of the blade body 1, the blade body 1 is widened to its maximum width, and the maximum blade width b sin1 For b sin1 =1.25b0; the widening section 31 of the trailing edge 12 of the blade widens laterally from the starting position to the trailing edge 12 of the blade, and the blade width b sin The corresponding blade length L follows a sinusoidal distribution law, and the controlling law is:

[0054] Where x = L1 - L, and the range of values ​​is...

[0055] The size parameters of the impeller blade 100 based on the tail fin fish scale biomimetic structure in this embodiment of the invention can be obtained by using the size parameters of the prototype impeller blade, and the fluid flow characteristics of the trailing edge can be optimized.

[0056] In some embodiments, the depth of the groove 32 gradually increases along the direction from the leading edge 2 to the trailing edge 3. The groove 32 is formed by a partial depression of the end face of the trailing edge 3, and the groove 32 generally follows... Figure 1 As shown, extending along the length direction, the depth of the groove 32 near the leading edge 2 gradually increases from 0 and reaches its maximum at the end of the groove 32 away from the leading edge 2.

[0057] Meanwhile, in this embodiment of the invention, the groove 32 is arranged at the trailing edge 3 along the tangential direction of the rotation of the blade body 1.

[0058] Optionally, one end of the groove 32 extends to the end of the trailing edge 3 near the leading edge 2, and the other end of the groove 32 extends to the end of the trailing edge 3 away from the leading edge 2. That is, the groove 32 can cover the trailing edge 3... Figure 1The entire region along the length direction shown.

[0059] Furthermore, the length of the trailing edge portion 3 is 10% to 15% of the total length of the blade body 1. That is, if the total length of the blade body 1 is L1, then the trailing edge portion 3... Figure 1 The dimension S in the length direction shown is 10%L1 to 15%L1.

[0060] For example, the length of the trailing edge 3 is 10%, 11%, 12.5%, 14%, 14.3%, or 15% of the total length of the blade body 1. When the length of the trailing edge 3 is greater than 15% or less than 10%, it is easy to cause poor fluid flow control. By imposing proportional constraints on the length of the trailing edge 3, the present invention can optimize the fluid flow characteristics and improve the performance of the impeller blade.

[0061] like Figure 4 As shown, in order to further optimize the trailing edge 3 and improve the fluid flow characteristics, in this embodiment of the invention, multiple grooves 32 are located at the trailing edge 3 on the suction side of the blade body 1. The multiple grooves 32 are constructed as sinusoidal grooves that follow a sinusoidal curve. The maximum groove depth of the sinusoidal groove is A, and the groove depth gradually decreases from A to zero along the blade profile. The sinusoidal curve followed by the sinusoidal groove satisfies the following:

[0062] A = (0.3~0.6)δ;

[0063] λ = 0.15b0 ~ 0.3b0;

[0064] Where A is the amplitude of the sine curve to which the sinusoidal groove follows, δ is the thickness of the trailing edge 3, λ is the wavelength of the sine curve to which the sinusoidal groove follows, and b0 is the minimum width dimension of the end of the widened section 31 near the leading edge 2.

[0065] A can be 0.3δ, 0.35δ, 0.43δ, 0.5δ, 0.56δ, or 0.6δ, and λ can be 0.15b0, 0.18b0, 0.2b0, 0.23b0, 0.24b0, 0.25b0, 0.27b0, or 0.3b0. This invention optimizes the arrangement of multiple grooves by rationally controlling the amplitude and wavelength of the sine curve followed by the sinusoidal grooves, resulting in smoother flow of the trailing fluid. Furthermore, the grooves can be used to regulate and control the trailing fluid, thus optimizing its flow characteristics.

[0066] right Figure 2 When the prototype impeller blades shown are optimized and improved, the main parameters of the sine curve that the sine groove follows can be obtained based on the size of the prototype impeller blades. This provides more accurate parameter data for the design of groove 32, enabling it to more effectively simulate the shape and surface texture that are closer to the tail fin shape, thereby improving the control performance of fluid flow.

[0067] This invention optimizes the structure at the trailing edge of the blade body 1, and through the design and optimization of the width parameters of the trailing edge 3 and the parameters of the groove 32, it not only facilitates processing and manufacturing and mass production, but also more effectively simulates the morphology of the tail fin and the detailed features such as surface texture, thereby improving the fluid flow characteristics of the trailing edge 12 of the blade.

[0068] As a specific embodiment, in the impeller blades of this embodiment of the invention, the number of impeller blades is 3 to 20, the trailing edge thickness of the impeller blades is δ = 1 to 8 mm, and the width dimension of the widened section in the trailing edge of the impeller blade gradually increases from b0 to 1.25b0, where b0 = 10 to 20 mm, and the width dimension b of the widened section 31 is... sin The variation along the length of the trailing edge 3 follows a sinusoidal curve distribution. In this embodiment of the invention, the maximum groove depth of the groove at the trailing edge is (0.3~0.6)δ, and the groove depth gradually increases from 0 to (0.3~0.6)δ along the direction from the leading edge 2 to the trailing edge 3. Furthermore, the multiple grooves are sinusoidal grooves that follow the sinusoidal curve variation described in the above embodiment.

[0069] Therefore, the impeller blades in this embodiment of the invention can not only more accurately simulate the tail fin structure, but also characterize the shape changes and surface textures of the tail fin scales. The blade body has a highly optimized tail fin scale biomimetic morphology to adapt to complex fluid environments, thereby enabling the blade body to have excellent propulsion performance during impeller rotation, and also effectively reduce fluid resistance and improve fluid flow control performance.

[0070] The impeller of this invention includes the impeller blades 100 based on the tail fin scale biomimetic structure in any of the above embodiments. The beneficial effects achieved by the impeller of this invention include at least the beneficial effects achieved by the impeller blades 100 based on the tail fin scale biomimetic structure in any of the above embodiments, and therefore will not be repeated.

[0071] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0072] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0073] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0074] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0075] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0076] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An impeller blade based on a tail fin scale biomimetic structure, characterized in that, Includes a blade body, the blade body having a leading edge and a trailing edge; The rear edge portion has a widening section at the end away from the front edge portion. The width of the widening section gradually increases in the direction from the front edge portion to the rear edge portion. The rear edge portion has multiple grooves arranged sequentially along its width direction to make the rear edge portion have a tail fin scale biomimetic structure. The widened section has sinusoidal curves on both sides in its width direction; The depth of the groove gradually increases along the direction from the leading edge to the trailing edge; The groove depth at the end furthest from the leading edge is: A The depth of the groove gradually decreases to zero from the end away from the leading edge to the end closer to the leading edge; One end of the groove extends to the rear edge portion near the front edge portion, and the other end of the groove extends to the rear edge portion away from the front edge portion; The groove is located at the trailing edge of the suction side of the blade body; The length of the trailing edge portion is 10% to 15% of the total length of the blade body; The width dimension of the extended section The variation in the length direction of the trailing edge satisfies: ； in, , The width dimension is the end of the extended section closest to the leading edge.

2. The impeller blade based on the tail fin scale biomimetic structure according to claim 1, characterized in that, The maximum width dimension of the expansion section It is 1.15 ~1.35 The length of the extended section is 0.

15. ~0.3 .

3. The impeller blade based on the biomimetic structure of a tail fin fish scale as described in claim 2, characterized in that, The multiple grooves are constructed as sinusoidal grooves that conform to a sinusoidal curve.

4. The impeller blade based on the tail fin scale biomimetic structure according to claim 3, characterized in that, The maximum groove depth of the sinusoidal groove is A And the sinusoidal groove follows a sinusoidal curve that satisfies: ； =0.15 ~0.3 ； in, A Let be the amplitude of the sine curve to which the sinusoidal groove follows. The thickness of the trailing edge portion. The wavelength of the sine curve that the sinusoidal groove follows. The minimum width dimension of the extended section near the leading edge.

5. An impeller, characterized in that, Including impeller blades based on the biomimetic structure of fish scales in the tail fin as described in any one of claims 1 to 4.

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