A flow control method based on curved fish scale bionic structure and an impeller blade having the same

Abstract

The present invention provides a flow control method based on a curved fish-scale bionic structure, comprising the following steps: S1. constructing the main structure of an impeller blade, including a suction surface e and a pressure surface f, each of which is provided with a fish-scale region g having a plurality of regularly arranged fish-scale bionic structure coupling elements; S2. constructing and designing a single fish-scale bionic structure coupling element, including a bottom surface conforming to the blade surface and a top surface in a fish-scale structure, the top surface including a sector-shaped surface whose vertex coincides with the midpoint of one side of the bottom surface, and two triangular oblique surfaces with the hypotenuse of the sector surface as the hypotenuse, establishing a spatial rectangular coordinate system with the vertex of the sector as the origin, and constructing the fish-scale bionic structure coupling element in the spatial rectangular coordinate system; S3. establishing a regular arrangement of the plurality of fish-scale bionic structures. Based on the control of flow by the bionic structure, the present invention can improve the flow characteristics of fluid on the blade surface and reduce noise during the operation of a vane pump.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid machinery, and in particular to a flow control method based on a curved fish-scale bionic structure and an impeller blade having the same. Background Art

[0002] In recent years, with the continuous deepening of human exploration of nature, bionic surface drag reduction and noise reduction technology has been rapidly developed and widely used. Among them, fish have become an important research object in drag reduction and noise reduction bionics due to their rapidity and stealth in swimming in water. The reason why fish have fast and flexible swimming characteristics is closely related to the surface structure of various areas of their body surface, which can improve the fluid structure and flow state of the turbulent boundary layer, thereby effectively reducing water resistance and achieving extremely high swimming speeds. Therefore, this patent proposes a flow control method based on a curved fish scale bionic structure and an impeller blade having the same, based on the flow control of the bionic surface structure coupling element, to improve the fluid flow characteristics of the blade surface, reduce flow resistance, and reduce the noise during the operation of the vane pump. Summary of the Invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To achieve the above object, the present invention proposes a flow control method based on a curved fish scale bionic structure, comprising the following steps:

[0005] S1. Construct the main structure of the impeller blade, including the blade leading edge a, the blade trailing edge b, the blade top c, the blade root d, the suction surface e and the pressure surface f on both sides of the blade body, and provide fish scale areas g with multiple fish scale bionic structure coupling elements arranged in a regular pattern on the suction surface e and the pressure surface f;

[0006] S2. Construct and design a single fish-scale bionic structure coupling element, including a bottom surface that fits the surface of the blade and a top surface with a fish-scale structure. The top surface includes a sector-shaped surface whose vertex coincides with the midpoint of one side of the bottom surface, the sector-shaped surface has a radius of r, and two triangular oblique surfaces with the hypotenuse of the sector-shaped surface as the hypotenuse. The center point O of the sector-shaped surface is defined as the front end point of the fish-scale bionic structure coupling element. A spatial rectangular coordinate system is established with point O as the origin, and the fish-scale bionic structure coupling element is constructed in the spatial rectangular coordinate system;

[0007] S3. Establish multiple fish scale bionic structure arrangement rules, and construct the fish scale bionic structure as a whole according to the arrangement rules for multiple fish scale bionic structure coupling elements in each fish scale area.

[0008] The present invention controls the flow based on the bionic structure, can improve the fluid flow characteristics on the blade surface and reduce the noise during the operation of the vane pump.

[0009] Optionally, in S1, when constructing the main structure of the impeller blade, the thickness δ of the blade trailing edge b is in the range of 1-50 mm, and the length k of the blade trailing edge b is in the range of 1-50 mm.

[0010] Furthermore, in S3, constructing a single fish scale bionic structure includes the following steps:

[0011] S21. Define a sector surface OP1P2P3 on the xy plane of the spatial rectangular coordinate system, where P1 and P3 are the end points of the sector arc segment, P2 is the midpoint of the arc segment, and the half angle of the sector vertex is defined as ∠P1OP2=α;

[0012] S22. With the y-axis as the rotation axis, rotate the sector surface OP1P2P3 by an opening and closing angle β to obtain the sector surface OP4P5P6. Define β = ∠P2OP5. The sector surface OP4P5P6 is referred to as sector surface I.

[0013] S23. Fix ∠P1P7O=90° in the xy plane of the spatial coordinate system, and fix ∠P8P7O=90° in the yz plane. Let the inclined plane OP4P8 be inclined plane I.

[0014] S24, in the spatial rectangular coordinate system, the inclined plane OP4P8 is symmetrical about the xz plane to form the inclined plane OP6P 10 , where ∠P3P9O=90°, ∠P 10 P9O=90°, note the inclined plane OP6P 10 It is inclined plane II.

[0015] Furthermore, the z-axis coordinate of P8 is 0.3 times the z-axis coordinate of P4, 10 The z-axis coordinate of is 0.3 times the z-axis coordinate of P6.

[0016] Further, according to step S2, P1 to P 10 The coordinate values ​​of point P1 = (x1, y1, z1) are determined as follows: The coordinate values ​​x1, y1, and z1 of point P1 = (x1, y1, z1) are:

[0017] x1=r·cosα;

[0018] y1=r·sinα;

[0019] z1=0;

[0020] The coordinates x2, y2, and z2 of point P2 = (x2, y2, z2) are:

[0021] x2=r;

[0022] y2=0;

[0023] z2=0;

[0024] The coordinates x3, y3, and z3 of point P3 = (x3, y3, z3) are:

[0025] x3=r·cosα;

[0026] y3=-r·sinα;

[0027] z3=0;

[0028] The coordinates x4, y4, and z4 of point P4 = (x4, y4, z4) are:

[0029] x4=r·cosα·cosβ;

[0030] y4=r·sinα;

[0031] z4=r·cosα·sinβ;

[0032] The coordinates x5, y5, and z5 of point P5 = (x5, y5, z5) are:

[0033] x5=r·cosβ;

[0034] y5=0;

[0035] z5=r·sinβ;

[0036] The coordinates x6, y6, and z6 of point P6 = (x6, y6, z6) are:

[0037] x6=r·cosα·cosβ;

[0038] y6=-r·sinα;

[0039] z6=r·cosα·sinβ;

[0040] The coordinates x7, y7, and z7 of point P7 = (x7, y7, z7) are:

[0041] x7=0;

[0042] y7=r·sinα;

[0043] z7=0;

[0044] The coordinates x8, y8, and z8 of point P8 = (x8, y8, z8) are:

[0045] x8=0;

[0046] y8=r·sinα;

[0047] z8=0.3·r·cosα·sinβ;

[0048] The coordinates x9, y9, and z9 of point P9 = (x9, y9, z9) are:

[0049] x9=0;

[0050] y9=-r·sinα;

[0051] z9=0;

[0052] Click P 10 =(x 10 ,y 10 , z 10 )'s coordinate value x 10 、y 10 、z 10 They are:

[0053] x 10 =0;

[0054] y 10 =-r·sinα;

[0055] z 10 =0.3·r·cosα·sinβ.

[0056] Furthermore, in said S21, the half angle α of the sector vertex angle ranges from 0<α<45°, and the radius r of the sector ranges from 0 <r。

[0057] Furthermore, the opening and closing angle β between the sector surface OP1P2P3 and the sector surface OP4P5P6 is in the range of 0<β≤10°.

[0058] Furthermore, in S3, the arrangement rules of the multiple fish scale bionic structures include:

[0059] S31, flattening the suction surface r or the pressure surface f to keep each fish scale area g in a flat state;

[0060] S32, taking the front end point of the first complete fish scale bionic structure coupling element in the first row close to the blade root d as the origin, establish a plane rectangular coordinate system, and record the front end point of each fish scale bionic structure coupling element as O i,j , where i represents the row number, j represents the number of the coupling element in the row, i,j =(x, y), the coordinate values ​​x and y are:

[0061]

[0062] Furthermore, the coverage of the fish scale area is designed, and the length of the fish scale area g accounts for 20%-80% of the total length of the blade along the flow direction, and the width of the fish scale area g is set to be equal to the blade width.

[0063] The present invention also provides a curved fish-scale bionic structure coupling element manufactured using the above-mentioned flow control method, comprising a bottom surface conforming to the surface of a blade, a top surface in a fish-scale structure, and a side surface vertically connecting the bottom surface and the top surface;

[0064] The top surface includes a sector-shaped surface whose vertex coincides with the midpoint of one side of the bottom surface, the sector-shaped surface has a radius of r, and two triangular oblique surfaces with the hypotenuse of the sector-shaped surface as the hypotenuse;

[0065] Each triangular slope includes a first point coinciding with the vertex of the sector, a second point directly opposite the hypotenuse of the sector, and a third point coinciding with the endpoint of the arc side of the sector, wherein the height of the second point is 0.3 times the height of the third point;

[0066] The bottom surface is a quadrilateral, wherein one side facing the sector-shaped arc edge is arranged in the same manner as the sector-shaped arc edge, and the remaining three sides are arranged perpendicular to each other.

[0067] The present invention also provides a bionic impeller blade made using the curved fish scale bionic structure coupling element as described above, including a blade leading edge a, a blade trailing edge b, a blade top c, a blade root d, a suction surface e and a pressure surface f on both sides of the blade body, and fish scale areas g with multiple fish scale bionic structure coupling elements arranged in a regular pattern are provided on the suction surface e and the pressure surface f.

[0068] Furthermore, the length of the fish scale region g accounts for 20%-80% of the entire length of the blade along the flow direction, and the width of the fish scale region g is set to be equal to the width of the blade.

[0069] The present invention also provides an impeller made using the bionic impeller blades described above, comprising an impeller body, on which a plurality of bionic impeller blades are provided, wherein the number of bionic impeller blades ranges from 3 to 20.

[0070] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0072] Figure 1 A schematic diagram of a blade structure designed according to a flow control method based on a curved fish scale bionic structure of the present invention;

[0073] Figure 2 2. This is a schematic diagram of a fish scale bionic structure coupling element structure designed according to another flow control method based on a curved fish scale bionic structure of the present invention;

[0074] Figure 3The figure is a schematic diagram of the arrangement of fish scale bionic structure coupling elements according to a flow control method based on a curved fish scale bionic structure of the present invention. DETAILED DESCRIPTION

[0075] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0076] The present invention provides a flow control method based on a curved fish scale bionic structure, comprising the following steps:

[0077] S1. Construct the main structure of the impeller blade, including the blade leading edge a, the blade trailing edge b, the blade top c, the blade root d, the suction surface e and the pressure surface f on both sides of the blade body, and provide fish scale areas g with multiple fish scale bionic structure coupling elements arranged in a regular pattern on the suction surface e and the pressure surface f;

[0078] S2. Construct and design a single fish-scale bionic structure coupling element, including a bottom surface that fits the surface of the blade and a top surface with a fish-scale structure. The top surface includes a sector-shaped surface whose vertex coincides with the midpoint of one side of the bottom surface, the sector-shaped surface has a radius of r, and two triangular oblique surfaces with the hypotenuse of the sector-shaped surface as the hypotenuse. The center point O of the sector-shaped surface is defined as the front end point of the fish-scale bionic structure coupling element. A spatial rectangular coordinate system is established with point O as the origin, and the fish-scale bionic structure coupling element is constructed in the spatial rectangular coordinate system;

[0079] S3. Establish multiple fish scale bionic structure arrangement rules, and construct the fish scale bionic structure as a whole according to the arrangement rules for multiple fish scale bionic structure coupling elements in each fish scale area.

[0080] Based on the control of flow by bionic structure, the present invention designs an impeller blade with a fish scale area composed of multiple fish scale bionic structure coupling elements, so that the surface of the impeller blade can have a fish scale bionic structure, which is used to improve the fluid flow characteristics of the blade surface and reduce the noise during the operation of the vane pump.

[0081] In some embodiments, in said S1, when constructing the main structure of the impeller blade, the thickness δ of the blade trailing edge b is in the range of 1-50 mm, and the length k of the blade trailing edge b is in the range of 1-50 mm.

[0082] In some embodiments, in S3, constructing a single fish scale bionic structure comprises the following steps:

[0083] S21. Define a sector surface OP1P2P3 on the xy plane of the spatial rectangular coordinate system, where P1 and P3 are the end points of the sector arc segment, P2 is the midpoint of the arc segment, and the half angle of the sector vertex is defined as ∠P1OP2=α;

[0084] S22. With the y-axis as the rotation axis, rotate the sector surface OP1P2P3 by an opening and closing angle β to obtain the sector surface OP4P5P6. Define β = ∠P2OP5. The sector surface OP4P5P6 is referred to as sector surface I.

[0085] S23. Fix ∠P1P7O=90° in the xy plane of the spatial coordinate system, and fix ∠P8P7O=90° in the yz plane. Let the inclined plane OP4P8 be inclined plane I.

[0086] S24, in the spatial rectangular coordinate system, the inclined plane OP4P8 is symmetrical about the xz plane to form the inclined plane OP6P 10 , where ∠P3P9O=90°, ∠P 10 P9O=90°, note the inclined plane OP6P 10 It is inclined plane II.

[0087] In some embodiments, the z-axis coordinate of P8 is 0.3 times the z-axis coordinate of P4. 10 The z-axis coordinate of is 0.3 times the z-axis coordinate of P6.

[0088] In some embodiments, according to step S2, P1 to P 10 The coordinate values ​​are determined as follows:

[0089] The coordinates x1, y1, and z1 of point P1 = (x1, y1, z1) are:

[0090] x1=r·cosα;

[0091] y1=r·sinα;

[0092] z1=0;

[0093] The coordinates x2, y2, and z2 of point P2 = (x2, y2, z2) are:

[0094] x2=r;

[0095] y2=0;

[0096] z2=0;

[0097] The coordinates x3, y3, and z3 of point P3 = (x3, y3, z3) are:

[0098] x3=r·cosα;

[0099] y3=-r·sinα;

[0100] z3=0;

[0101] The coordinates x4, y4, and z4 of point P4 = (x4, y4, z4) are:

[0102] x4=r·cosα·cosβ;

[0103] y4=r·sinα;

[0104] z4=r·cosα·sinβ;

[0105] The coordinates x5, y5, and z5 of point P5 = (x5, y5, z5) are:

[0106] x5=r·cosβ;

[0107] y5=0;

[0108] z5=r·sinβ;

[0109] The coordinates x6, y6, and z6 of point P6 = (x6, y6, z6) are:

[0110] x6=r·cosα·cosβ;

[0111] y6=-r·sinα;

[0112] z6=r·cosα·sinβ;

[0113] The coordinates x7, y7, and z7 of point P7 = (x7, y7, z7) are:

[0114] x7=0;

[0115] y7=r·sinα;

[0116] z7=0;

[0117] The coordinates x8, y8, and z8 of point P8 = (x8, y8, z8) are:

[0118] x8=0;

[0119] y8=r·sinα;

[0120] z8=0.3·r·cosα·sinβ;

[0121] The coordinates x9, y9, and z9 of point P9 = (x9, y9, z9) are:

[0122] x9=0;

[0123] y9=-r·sinα;

[0124] z9=0;

[0125] Click P 10 =(x 10 ,y 10 , z 10 )'s coordinate value x 10 、y 10 、z 10 They are:

[0126] x 10 =0;

[0127] y 10 =-r·sinα;

[0128] z 10 =0.3·r·cosα·sinβ.

[0129] In some embodiments, in said S21, the half angle α of the sector vertex angle ranges from 0<α<45°, and the radius r of the sector ranges from 0 <r。

[0130] In some embodiments, the opening and closing angle β between the sector surface OP1P2P3 and the sector surface OP4P5P6 is in the range of 0<β≤10°.

[0131] In some embodiments, in S3, the arrangement rules of the multiple fish scale bionic structures include:

[0132] S31, flattening the suction surface r or the pressure surface f to keep each fish scale area g in a flat state;

[0133] S32, taking the front end point of the first complete fish scale bionic structure coupling element in the first row close to the blade root d as the origin, establish a plane rectangular coordinate system, and record the front end point of each fish scale bionic structure coupling element as O i,j , where i represents the row number, j represents the number of the coupling element in the row, i,j =(x, y), the coordinate values ​​x and y are:

[0134]

[0135] In some embodiments, it can be understood that the arrangement of the fish scale bionic structure coupling elements in the flattened state of the fish scale area g is only an arrangement rule, and does not mean that the fish scale area g must be a plane in the flattened state. The impeller blades themselves can have a certain curvature, that is, the surface of the fish scale area g can also have a certain curvature, and it is not necessarily a flat state. However, the arrangement of the fish scale area g in the flattened state still conforms to the above-mentioned multiple fish scale bionic structure arrangement rules.

[0136] In some embodiments, the scale area coverage is designed so that the length of the scale area g along the flow direction is 20%-80% of the total blade length, and the width of the scale area g is equal to the blade width. This ensures that the scale area g has sufficient coverage on the blade surface to achieve the technical effects of improving the fluid flow characteristics on the blade surface and reducing noise.

[0137] The present invention also provides a curved fish-scale bionic structure coupling element manufactured using the above-mentioned flow control method, comprising a bottom surface conforming to the surface of a blade, a top surface in a fish-scale structure, and a side surface vertically connecting the bottom surface and the top surface;

[0138] The top surface includes a sector-shaped surface whose vertex coincides with the midpoint of one side of the bottom surface, the sector-shaped surface has a radius of r, and two triangular oblique surfaces with the hypotenuse of the sector-shaped surface as the hypotenuse;

[0139] Each triangular slope includes a first point coinciding with the vertex of the sector, a second point directly opposite the hypotenuse of the sector, and a third point coinciding with the endpoint of the arc side of the sector, wherein the height of the second point is 0.3 times the height of the third point;

[0140] The bottom surface is a quadrilateral, wherein one side facing the sector-shaped arc edge is arranged in the same manner as the sector-shaped arc edge, and the remaining three sides are arranged perpendicular to each other.

[0141] The present invention also provides a bionic impeller blade made using the above-mentioned curved fish scale bionic structure coupling element, including a blade leading edge a, a blade trailing edge b, a blade top c, a blade root d, a suction surface e and a pressure surface f on both sides of the blade body, and a fish scale area g with multiple fish scale bionic structure coupling elements arranged in a regular pattern is provided on the suction surface e and the pressure surface f.

[0142] In some embodiments, the length of the fish scale region g in the flow direction is 20% to 80% of the total length of the blade, and the width of the fish scale region g is set equal to the blade width. This ensures that the fish scale region g has sufficient coverage on the blade surface to achieve the technical effects of improving the fluid flow characteristics on the blade surface and reducing noise.

[0143] In some embodiments, the thickness δ of the blade trailing edge b is in the range of 1-50 mm, and the length k of the blade trailing edge b is in the range of 1-50 mm.

[0144] The present invention also provides an impeller made using the bionic impeller blades as described above, comprising an impeller body, on which a plurality of bionic impeller blades are arranged, and the number of bionic impeller blades is set in the range of 3-20.

[0145] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0146] 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0147] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0148] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0149] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0150] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A flow control method based on a curved fish scale bionic structure, characterized in that: The following steps are involved: S1. Construct the main structure of the impeller blade, including the blade leading edge a, the blade trailing edge b, the blade top c, the blade root d, the suction surface e and the pressure surface f on both sides of the blade body, and provide fish scale areas g with multiple fish scale bionic structure coupling elements arranged in a regular pattern on the suction surface e and the pressure surface f; S2. Construct and design a single fish-scale bionic structure coupling element, including a bottom surface that fits the surface of the blade and a top surface with a fish-scale structure. The top surface includes a sector-shaped surface whose vertex coincides with the midpoint of one side of the bottom surface, the sector-shaped surface has a radius of r, and two triangular oblique surfaces with the hypotenuse of the sector-shaped surface as the hypotenuse. The center point O of the sector-shaped surface is defined as the front end point of the fish-scale bionic structure coupling element. A spatial rectangular coordinate system is established with point O as the origin, and the fish-scale bionic structure coupling element is constructed in the spatial rectangular coordinate system; S3, establishing a plurality of fish scale bionic structure arrangement rules, and constructing the fish scale bionic structure as a whole in each fish scale region by arranging a plurality of fish scale bionic structure coupling elements according to the arrangement rules; In S3, constructing a single fish scale bionic structure includes the following steps: S21. Define a sector surface OP1P2P3 on the xy plane of the spatial rectangular coordinate system, where P1 and P3 are the end points of the sector arc segment, P2 is the midpoint of the arc segment, and the half angle of the sector vertex is defined as ∠P1OP2=α; S22. With the y-axis as the rotation axis, rotate the sector surface OP1P2P3 by an opening and closing angle β to obtain the sector surface OP4P5P6. Define β = ∠P2OP5. The sector surface OP4P5P6 is referred to as sector surface I. S23. Fix ∠P1P7O=90° in the xy plane of the spatial coordinate system, and fix ∠P8P7O=90° in the yz plane. Let the inclined plane OP4P8 be inclined plane I. S24, in the spatial rectangular coordinate system, the inclined plane OP4P8 is symmetrical about the xz plane to form the inclined plane OP6P 10 , where ∠P3P9O=90°, ∠P 10 P9O=90°, note the inclined plane OP6P 10 It is inclined plane II.

2. The flow control method based on the curved fish scale bionic structure according to claim 1, characterized in that: In the above S1, when constructing the main structure of the impeller blade, the thickness of the blade trailing edge b is δ The range is 1-50mm, the length of the blade trailing edge b k The range is 1-50mm.

3. The flow control method based on the curved fish scale bionic structure according to claim 1, characterized in that: The z-axis coordinate of P8 is 0.3 times the z-axis coordinate of P4. 10 The z-axis coordinate of is 0.3 times the z-axis coordinate of P6.

4. The flow control method based on the curved fish scale bionic structure according to claim 3, characterized in that: According to step S2, P 1 to P 10 The coordinate values ​​are determined as follows: point P 1=( x 1, y 1, z 1) Coordinate values x 1. y 1. z 1 are: point P 2=( x 2, y 2, z 2) Coordinate values x 2. y 2. z 2 are: point P 3=( x 3. y 3. z 3) Coordinate values x 3. y 3. z 3 are: point P 4=( x 4. y 4. z 4) Coordinate values x 4. y 4. z 4 are: point P 5=( x 5. y 5. z 5) Coordinate values x 5. y 5. z 5 are: point P 6=( x 6. y 6. z 6) Coordinate values x 6. y 6. z 6 are: point P 7=( x 7, y 7, z 7) Coordinate values x 7. y 7. z 7 are: point P 8=( x 8, y 8, z 8) Coordinate values x 8. y 8. z 8 are: point P 9=( x 9, y 9, z 9) Coordinate values x 9. y 9. z 9 are: point P 10 =( x 10 , y 10 , z 10 ) coordinate values x 10 、 y 10 、 z 10 They are:

5. A flow control method based on a curved fish scale bionic structure according to any one of claim 4, characterized in that: In S21, the half angle α of the sector vertex angle ranges from , the radius r of the sector ranges from .

6. A flow control method based on a curved fish scale bionic structure according to any one of claim 4, characterized in that: The range of the opening and closing angle β between the sector surface OP1P2P3 and the sector surface OP4P5P6 is .

7. The flow control method based on the curved fish scale bionic structure according to claim 1, characterized in that: In S3, the arrangement rules of the multiple fish scale bionic structures include: S31, flattening the suction surface r or the pressure surface f to keep each fish scale area g in a flat state; S32, taking the front end point of the first complete fish scale bionic structure coupling element in the first row close to the blade root d as the origin, establish a plane rectangular coordinate system, and record the front end point of each fish scale bionic structure coupling element as O i,j , where i represents the row number, j represents the number of the coupling element in the row, O i,j =( x , y ), coordinate values x 、 y They are:

8. A flow control method based on a curved fish scale bionic structure according to any one of claims 1 to 7, characterized in that: The coverage range of the fish scale area is designed, and the length of the fish scale area g accounts for 20%-80% of the total length of the blade along the flow direction. The width of the fish scale area g is set to be equal to the blade width.

9. A curved fish-scale bionic structure coupling element manufactured using the flow control method according to claim 8, characterized in that: It includes a bottom surface that fits the surface of the blade, a top surface with a fish scale structure, and a side surface that vertically connects the bottom surface and the top surface; The top surface includes a sector-shaped surface whose vertex coincides with the midpoint of one side of the bottom surface, the sector-shaped surface has a radius of r, and two triangular oblique surfaces with the hypotenuse of the sector-shaped surface as the hypotenuse; Each triangular slope includes a first point coinciding with the vertex of the sector, a second point directly opposite the hypotenuse of the sector, and a third point coinciding with the endpoint of the arc side of the sector, wherein the height of the second point is 0.3 times the height of the third point; The bottom surface is a quadrilateral, wherein one side facing the sector-shaped arc edge is arranged in the same manner as the sector-shaped arc edge, and the remaining three sides are arranged perpendicular to each other.

10. A bionic impeller blade manufactured using the curved fish scale bionic structure coupling element according to claim 9, characterized in that: It includes the leading edge a of the blade, the trailing edge b of the blade, the top c of the blade, the root d, the suction surface e and the pressure surface f on both sides of the blade body. Both the suction surface e and the pressure surface f are provided with fish scale areas g with multiple fish scale bionic structure coupling elements arranged in a regular pattern.

11. The bionic impeller blade according to claim 10, characterized in that: The length of the fish scale region g accounts for 20%-80% of the total length of the blade along the flow direction, and the width of the fish scale region g is set to be equal to the width of the blade.

12. An impeller manufactured using the bionic impeller blade according to any one of claims 10-11, characterized in that: It comprises an impeller body, on which a plurality of bionic impeller blades are arranged, and the number of the bionic impeller blades is set in the range of 3-20.

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