Flow control method based on double-curved-surface fish scale bionic structure and impeller blade with double-curved-surface fish scale bionic structure

Abstract

The invention provides a flow control method based on a double-curved-surface fish scale bionic structure, which comprises the following steps: S1, constructing a main body structure of an impeller blade, including a suction surface e and a pressure surface f, and arranging fish scale areas g with a plurality of fish scale bionic structure coupling elements which are regularly arranged on the suction surface e and the pressure surface f; s2, a single fish scale bionic structure coupling element is constructed and designed, the single fish scale bionic structure coupling element comprises a bottom face attached to the surface of the blade and a top face of a fish scale structure, the top face comprises a folded hexagonal face and three grooves parallel to the edges, the folded line end points of the folded hexagonal face coincide with the bottom face, and a space rectangular coordinate system is established with the folded line end points as the original points; constructing fish scale bionic structure coupling elements in the space rectangular coordinate system; and S3, establishing a plurality of fish scale bionic structure arrangement rules. Based on flow control of a bionic structure, the flow characteristic of fluid on the surface of the blade can be improved, and noise is reduced.

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 hyperbolic 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 because of their rapidity and concealment in the 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 obtaining extremely high swimming speeds. Therefore, this patent proposes a flow control method based on a hyperbolic 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 on the blade surface, reduce flow resistance, and reduce noise generation. 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 hyperbolic fish scale bionic structure, comprising the following steps:

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

[0006] S2. Design and construct a single fish scale bionic structure coupling element, including a bottom surface that fits the blade surface and a top surface that has a fish scale structure. The top surface includes a folded hexagonal surface whose end point coincides with the bottom surface. The side length of the regular hexagonal surface after the folded hexagonal surface is projected is l h =l, and three grooves parallel to the edges, the fold line endpoint O of the folded hexagonal 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. Establishing multiple fish scale bionic structure arrangement rules, and constructing the overall fish scale bionic structure 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, and can improve the flow characteristics of the fluid on the blade surface and reduce the noise generation.

[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 comprises the following steps:

[0011] S21. Define a regular hexagonal surface OH1H2H3H4H5 on a plane with ∠H3OA=α with the xy plane of the spatial rectangular coordinate system, where O, H1, H2, H3, H4, and H5 are the six endpoints of the regular hexagon. The regular hexagonal surface OH1H2H3H4H5 is the bottom surface, and A is the intersection of the regular hexagonal prism edge line H3A and the xy plane;

[0012] S22. With H3O as the rotation axis, rotate the xy plane by opening and closing angles β and -β respectively to obtain flow surface Ⅰ and flow surface Ⅱ. Project the regular hexagonal surface onto flow surface Ⅰ and flow surface Ⅱ to obtain the folded hexagonal surface OF1F2F3F4F5.

[0013] Furthermore, on the folded hexagonal surface OF1F2F3F4F5, the nth (n=1, 2, 3) groove is formed by a fold line P parallel to the fold line F2F1OF5F4 on its edge. n_1 P n_3 P n_5 P n_4 P n_2 and polyline P n_9 P n_7 P n_6 P n_8 P n_10 OK. 1_1 P 1_3 P 1_5 P 1_4 P 1_2 The vertical distance is l g =g. Broken line P n_1 P n_3 P n_5 P n_4 P n_2 With the polyline P n_9 P n_ 7P n_6 P n_8 P n_10 The vertical distance, i.e. the groove width, is l w_1 =w. Broken line P n_1 P n_3 P n_5 P n_4 P n_2 With the polyline P (n+1)_ 1P (n+1)_3 P(n+1)_5 P (n+1)_4 P (n+1)_2 The vertical distance is l g =g+w. Parallel to the surface OF1F2F3, groove P n_1 P n_3 P n_5 P n_6 P n_ 7P n_9 The depth is l dn_1 = d. Parallel to surface OF3F4F5, groove P n_5 P n_4 P n_2 P n_10 P n_8 P n_6 The depth is l dn_2 =d.

[0014] Further, according to step S2, P n_j The coordinate values ​​of (n=1,2,3;j=1,2,3,……8,9,10) are determined. Since the feature is symmetrical with respect to line OF3, the coordinates of each point are as follows:

[0015] Click P n_1 =(x n_1_1 ,y n_1_1 , z n_1_1 ) and point P n_2 =(x n_2_1 ,y n_2_1 , z n_2_1 )'s coordinate value x n_j_1 ,y n_j_1 、z n_j_1 They are (n=1,2,3; j=1,2):

[0016]

[0017] Click P n_3 =(x n_3_2 ,y n_3_2 , z n_3_2 ) and point P n_4 =(x n_4_2 ,y n_4_2 , z n_4_2 )'s coordinate value x n_j_2 ,

[0018] y n_j_2 、z n_j_2 They are (n=1,2,3; j=3,4):

[0019]

[0020] Click P n_5 =(xn_5 ,y n_5 , z n_5 )'s coordinate value x n_5 ,y n_5 、z n_5 They are (n=1,2,3):

[0021]

[0022] y n_5 =0;

[0023]

[0024] Click P n_6 =(x n_6 ,y n_6 , z n_6 )'s coordinate value x n_6 ,y n_6 、z n_6 They are (n=1,2,3):

[0025]

[0026] y n_6 =0;

[0027]

[0028] Click P n_7 =(x n_7_3 ,y n_7_3 , z n_7_3 ) and point P n_8 =(x n_8_3 ,y n_8_3 , z n_8_3 )'s coordinate value x n_j_3 ,y n_j_3 、z n_j_3 They are (n=1,2,3; j=7,8):

[0029]

[0030] Click P n_9 =(x n_9_4 ,y n_9_4 , z n_9_4 ) and point P n_10 =(x n_10_4 ,y n_10_4 , z n_10_4 )'s coordinate value x n_j_4 ,y n_j_4 、z n_j_4 They are (n=1,2,3; j=9,10):

[0031]

[0032] Furthermore, the value range of ∠H3OA=α is 0<α<10°, and the value range of the angle β between the flow surface I and the xy plane is 0<β≤5°. The value range of the distance g is The range of distance w

[0033] Furthermore, in S3, the arrangement rules of the multiple fish scale bionic structures include:

[0034] S31, flattening the suction surface r or the pressure surface f to keep each fish scale area g in a flat state;

[0035] 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:

[0036] x=0.75·l·(i-1)i=1,2,3,...;

[0037]

[0038] 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 width of the blade.

[0039] The present invention also provides a hyperbolic fish scale bionic structure coupling element made by the above-mentioned flow control method, comprising a bottom surface that fits the surface of a blade, a top surface that has a fish scale structure, and a prism side surface that connects the bottom surface and the top surface;

[0040] The top surface includes a folded hexagonal surface whose end point of the fold line coincides with the bottom surface, and the side length of the regular hexagonal surface after the folded hexagonal surface is projected is l h = l, and three grooves parallel to the edges, the width of the groove is l w =w, depth l d =d; the vertical distance between the grooves is l g =g;

[0041] The bottom surface is a hexagon, and each side of the hexagon is an intersection line between the side surface of the prism with the regular hexagonal surface OH1H2H3H4H5 as the bottom surface and the xy plane.

[0042] The present invention also provides a bionic impeller blade made using the hyperbolic fish scale bionic structure coupling element as described above, comprising 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 having a plurality of fish scale bionic structure coupling elements arranged in a regular pattern are provided on the suction surface e and the pressure surface f.

[0043] Furthermore, 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.

[0044] 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.

[0045] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0047] Figure 1 A schematic diagram of a blade structure designed according to a flow control method based on a hyperbolic fish scale bionic structure of the present invention;

[0048] Figure 2 It is a schematic diagram of a fish scale bionic structure coupling element structure designed according to another flow control method based on a hyperbolic fish scale bionic structure of the present invention;

[0049] Figure 3 The figure is a schematic diagram of arrangement of fish scale bionic structure coupling elements according to a flow control method based on a hyperbolic fish scale bionic structure of the present invention. DETAILED DESCRIPTION

[0050] Embodiments of the present invention are described in detail below, 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 should not be construed as limiting the present invention.

[0051] The present invention provides a flow control method based on a hyperbolic fish scale bionic structure, comprising the following steps:

[0052] S1. Construct the main structure of the impeller blade, including the leading edge a of the blade, the trailing edge b of the blade, the top c of the blade, the root d of the blade, the suction surface e and the pressure surface f on both sides of the blade body, and the fish scale area g with multiple fish scale bionic structure coupling elements arranged regularly is provided on the suction surface e and the pressure surface f;

[0053] S2. Design and construct a single fish scale bionic structure coupling element, including a bottom surface that fits the blade surface and a top surface that has a fish scale structure. The top surface includes a folded hexagonal surface whose end point coincides with the bottom surface. The side length of the regular hexagonal surface after the folded hexagonal surface is projected is l h =l, and three grooves parallel to the edges, the fold line endpoint O of the folded hexagonal 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;

[0054] S3. Establishing multiple fish scale bionic structure arrangement rules, and constructing the overall fish scale bionic structure according to the arrangement rules for multiple fish scale bionic structure coupling elements in each fish scale area.

[0055] 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 to improve the fluid flow characteristics of the blade surface and reduce noise generation.

[0056] In some embodiments, 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.

[0057] In some embodiments, in S3, constructing a single fish scale bionic structure comprises the following steps:

[0058] S21. Define a regular hexagonal surface OH1H2H3H4H5 on a plane with ∠H3OA=α with the xy plane of the spatial rectangular coordinate system, where O, H1, H2, H3, H4, and H5 are the six endpoints of the regular hexagon. The regular hexagonal surface OH1H2H3H4H5 is the bottom surface, and A is the intersection of the regular hexagonal prism edge line H3A and the xy plane;

[0059] S22, with H3O as the rotation axis, rotate the xy plane by opening and closing angles β and -β respectively to obtain flow surface Ⅰ and flow surface Ⅱ, project the regular hexagonal surface onto flow surface Ⅰ and flow surface Ⅱ to obtain the folded hexagonal surface OF1F2F3F4F5;

[0060] In some embodiments, on the folded hexagonal surface OF1F2F3F4F5, the nth (n=1, 2, 3) groove is formed by a fold line P parallel to the fold line F2F1OF5F4 on its edge. n_1P n_3 P n_5 P n_4 P n_2 and polyline P n_9 P n_7 P n_6 P n_8 P n_10 OK. 1_1 P 1_3 P 1_5 P 1_4 P 1_2 The vertical distance is l g =g. Broken line P n_1 P n_3 P n_5 P n_4 P n_2 With the polyline P n_9 P n_ 7P n_6 P n_8 P n_10 The vertical distance, i.e. the groove width, is l w_1 =w. Broken line P n_1 P n_3 P n_5 P n_4 P n_2 With the polyline P (n+1)_ 1P (n+1)_3 P (n+1)_5 P (n+1)_4 P (n+1)_2 The vertical distance is l g =g+w. Parallel to the surface OF1F2F3, groove P n_1 P n_3 P n_5 P n_6 P n_ 7P n_9 The depth is l dn_1 = d. Parallel to surface OF3F4F5, groove P n_5 P n_4 P n_2 P n_10 P n_8 P n_6 The depth is l dn_2 =d.

[0061] In some embodiments, according to step S2, P n_j The coordinate values ​​of (n=1,2,3;j=1,2,3,……8,9,10) are determined. Since the feature is symmetrical with respect to line OF3, the coordinates of each point are as follows:

[0062] Click P n_1 =(x n_1_1 ,yn_1_1 , z n_1_1 ) and point P n_2 =(x n_2_1 ,y n_2_1 , z n_2_1 )'s coordinate value x n_j_1 ,y n_j_1 、z n_j_1 They are (n=1,2,3; j=1,2):

[0063]

[0064] Click P n_3 =(x n_3_2 ,y n_3_2 , z n_3_2 ) and point P n_4 =(x n_4_2 ,y n_4_2 , z n_4_2 )'s coordinate value x n_j_2 ,

[0065] y n_j_2 、z n_j_2 They are (n=1,2,3; j=3,4):

[0066]

[0067] Click P n_5 =(x n_5 ,y n_5 , z n_5 )'s coordinate value x n_5 ,y n_5 、z n_5 They are (n=1,2,3):

[0068]

[0069] y n_5 =0;

[0070]

[0071] Click P n_6 =(x n_6 ,y n_6 , z n_6 )'s coordinate value x n_6 ,y n_6 、z n_6 They are (n=1,2,3):

[0072]

[0073] y n_6 =0;

[0074]

[0075] Click P n_7 =(x n_7_3 ,y n_7_3 , z n_7_3 ) and point P n_8 =(x n_8_3 ,y n_8_3 , z n_8_3 )'s coordinate value x n_j_3 ,y n_j_3 、z n_j_3 They are (n=1,2,3; j=7,8):

[0076]

[0077] Click P n_9 =(x n_9_4 ,y n_9_4 , z n_9_4 ) and point P n_10 =(x n_10_4 ,y n_10_4 , z n_10_4 )'s coordinate value x n_j_4 ,y n_j_4 、z n_j_4 They are (n=1,2,3; j=9,10):

[0078]

[0079] In some embodiments, in S21, the value range of ∠H3OA=α is 0<α<10°, and the value range of the angle β between the flow surface I and the xy plane is 0<β≤5°. The value range of the distance g is The range of distance w

[0080] In some embodiments, in S3, the arrangement rules of the multiple fish scale bionic structures include:

[0081] S31, flattening the suction surface r or the pressure surface f to keep each fish scale area g in a flat state;

[0082] 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:

[0083] x=0.75·l·(i-1)i=1,2,3,...;

[0084]

[0085] 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.

[0086] In some embodiments, the coverage of the fish scale area is designed, 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 equal to the width of the blade. It is ensured that the fish scale area g has sufficient coverage area on the blade surface to achieve the technical effect of improving the fluid flow characteristics of the blade surface and reducing noise.

[0087] The present invention also provides a hyperbolic fish scale bionic structure coupling element made by the above-mentioned flow control method, comprising a bottom surface conforming to the blade surface, a top surface in a fish scale structure, and a prism side surface connecting the bottom surface and the top surface;

[0088] The top surface includes a folded hexagonal surface whose end point of the fold line coincides with the bottom surface, and the side length of the regular hexagonal surface after the folded hexagonal surface is projected is l h = l, and three grooves parallel to the edges, the width of the groove is l w =w, depth l d =d; the vertical distance between the grooves is l g =g;

[0089] The bottom surface is a hexagon, and each side of the hexagon is an intersection line between the side surface of the prism with the regular hexagonal surface OH1H2H3H4H5 as the bottom surface and the xy plane.

[0090] The present invention also provides a bionic impeller blade made using the above-mentioned hyperbolic fish scale bionic structure coupling element, comprising 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.

[0091] In some embodiments, 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 equal to the width of the blade, so as to ensure that the fish scale region g has sufficient coverage area on the blade surface to achieve the technical effect of improving the fluid flow characteristics on the blade surface and reducing noise.

[0092] 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.

[0093] The present invention also provides an impeller made using the bionic impeller blades as described in any one of the 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.

[0094] In the description of the present invention, it is to 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”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0095] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0096] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0097] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0098] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. 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 representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0099] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A flow control method based on a hyperbolic fish scale bionic structure, characterized in that: The following steps are involved: S1. Construct the main structure of the impeller blade, including the leading edge a of the blade, the trailing edge b of the blade, the top c of the blade, the root d of the blade, the suction surface e and the pressure surface f on both sides of the blade body, and the fish scale area g with multiple fish scale bionic structure coupling elements arranged regularly is provided on the suction surface e and the pressure surface f; S2. Design and construct a single fish scale bionic structure coupling element, including a bottom surface that fits the blade surface and a top surface that has a fish scale structure. The top surface includes a folded hexagonal surface whose end point coincides with the bottom surface. The side length of the regular hexagonal surface after the folded hexagonal surface is projected is l h =l, and three grooves parallel to the edges, the fold line endpoint O of the folded hexagonal 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 multiple fish scale bionic structure arrangement rules, and constructing the overall fish scale bionic structure according to the arrangement rules for multiple fish scale bionic structure coupling elements in each fish scale area.

2. A flow control method based on a hyperbolic fish scale bionic structure as claimed in claim 1, characterized in that: 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.

3. The flow control method based on the hyperbolic fish scale bionic structure according to claim 1, characterized in that: In S3, constructing a single fish scale bionic structure comprises the following steps: S21. Define a regular hexagonal surface OH1H2H3H4H5 on a plane with ∠H3OA=α with the xy plane of the spatial rectangular coordinate system, where O, H1, H2, H3, H4, and H5 are the six endpoints of the regular hexagon; take the regular hexagonal surface OH1H2H3H4H5 as the base, and A is the intersection of the regular hexagonal prism edge line H3A and the xy plane; S22. With H3O as the rotation axis, rotate the xy plane by opening and closing angles β and -β respectively to obtain flow surface Ⅰ and flow surface Ⅱ. Project the regular hexagonal surface onto flow surface Ⅰ and flow surface Ⅱ to obtain the folded hexagonal surface OF1F2F3F4F5.

4. The flow control method based on the hyperbolic fish scale bionic structure according to claim 1, characterized in that: On the folded hexagonal surface OF1F2F3F4F5, the nth (n=1,2,3) groove is formed by a fold line P parallel to the fold line F2F1OF5F4 on its edge. n_1 P n_3 P n_5 P n_4 P n_2 and polyline P n_9 P n_7 P n_6 P n_8 P n_10 Confirm; polyline F2F1OF5F4 and polyline P 1_1 P 1_3 P 1_5 P 1_ 4P 1_2 The vertical distance is l g =g; broken line P n_1 P n_3 P n_5 P n_4 P n_2 With the polyline P n_9 P n_7 P n_6 P n_8 P n_10 The vertical distance, i.e. the groove width, is l w_1 =w. Broken line P n_1 P n_3 P n_5 P n_4 P n_2 With the polyline P (n+1)_1 P (n+1)_3 P (n+1)_5 P (n+1)_4 P (n+1)_2 The vertical distance is l g =g+w. Parallel to the surface OF1F2F3, groove P n_1 P n_3 P n_5 P n_6 P n_7 P n_9 The depth is l dn_1 = d. Parallel to surface OF3F4F5, groove P n_5 P n_4 P n_2 P n_10 P n_8 P n_6 The depth is l dn_2 =d.

5. A flow control method based on a hyperbolic fish scale bionic structure as claimed in claim 4, characterized in that: P n_j The coordinate values ​​of (n=1,2,3;j=1,2,3,……8,9,10) are determined. Since the feature is symmetrical with respect to line OF3, the coordinates of each point are as follows: Point P n_1 =(x n_1_1 ,y n_1_1 , z n_1_1 ) and point P n_2 =(x n_2_1 ,y n_2_1 , z n_2_1 )'s coordinate value x n_j_1 ,y n_j_1 、z n_j_1 They are (n=1,2,3; j=1,2): Point P n_3 =(x n_3_2 ,y n_3_2 , z n_3_2 ) and point P n_4 =(x n_4_2 ,y n_4_2 , z n_4_2 )'s coordinate value x n_j_2 ,y n_j_2 、z n_j_2 They are (n=1,2,3; j=3,4): Point P n_5 =(x n_5 ,y n_5 , z n_5 )'s coordinate value x n_5 ,y n_5 、z n_5 They are (n=1,2,3): Point P n_6 =(x n_6 ,y n_6 , z n_6 )'s coordinate value x n_6 ,y n_6 、z n_6 They are (n=1,2,3): y n_6 ＝0； Point P n_7 =(x n_7_3 ,y n_7_3 , z n_7_3 ) and point P n_8 =(x n_8_3 ,y n_8_3 , z n_8_3 )'s coordinate value x n_j_3 ,y n_j_3 、z n_j_3 They are (n=1,2,3; j=7,8): Point P n_9 =(x n_9_4 ,y n_9_4 , z n_9_4 ) and point P n_10 =(x n_10_4 ,y n_10_4 , z n_10_4 )'s coordinate value x n_j_4 , y n_j_4 、z n_j_4 They are (n=1,2,3; j=9,10):

6. A flow control method based on a hyperbolic fish scale bionic structure as claimed in any one of claim 5, characterized in that: In S21, the value range of ∠H3OA=α is 0<α<10°, the value range of the angle β between the flow surface I and the xy plane is 0<β≤5°; the value range of the distance g is The range of distance w 7. The flow control method based on the hyperbolic 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, i,j =(x, y), the coordinate values ​​x and y are: x=0.75·l·(i-1)i=1,2,3,...; 8. A flow control method based on a hyperbolic fish scale bionic structure as claimed in any one of claims 1 to 7, characterized in that: 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 width of the blade.

9. A hyperbolic fish scale bionic structure coupling element manufactured by 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 that has a fish scale structure, and a prism side surface that connects the bottom surface and the top surface; The top surface includes a folded hexagonal surface whose end point of the fold line coincides with the bottom surface, and the side length of the regular hexagonal surface after the folded hexagonal surface is projected is l h = l, and three grooves parallel to the edges, the width of the groove is l w =w, depth l d =d; the vertical distance between the grooves is l g =g; The bottom surface is a hexagon, and each side of the hexagon is an intersection line between the side surface of the prism with the regular hexagonal surface OH1H2H3H4H5 as the bottom surface and the xy plane.

10. A bionic impeller blade made using the hyperbolic fish scale bionic structure coupling element as claimed in claim 9, characterized in that: It includes 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.

11. The bionic impeller blade according to claim 10, characterized in that: The length of the fish scale region g accounts for 20% to 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 made using the bionic impeller blades according to any one of claims 10 to 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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