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

Abstract

The application provides a flow control method based on a hyperboloid fish scale bionic structure, which comprises the following steps: S1, constructing a main structure of an impeller blade, including a suction surface e and a pressure surface f, and fish scale areas g with multiple fish scale bionic structure coupling elements arranged on the suction surface e and the pressure surface f; S2, constructing and designing a single fish scale bionic structure coupling element, including a bottom surface attached to the blade surface and a top surface in a fish scale structure, the top surface comprises a folded hexagonal surface with the end points of the fold lines coinciding with the bottom surface, and three grooves parallel to the edges, and a space rectangular coordinate system is established with the end points of the fold lines as the origin, and the fish scale bionic structure coupling element is constructed in the space rectangular coordinate system; and S3, establishing multiple fish scale bionic structure arrangement rules. The application can improve the fluid flow characteristics of the blade surface and reduce noise generation based on the control of flow by the bionic structure.

Description

Technical Field

[0001] This invention relates to the field of fluid machinery technology, and in particular to a flow control method based on a hyperboloid fish scale biomimetic structure and an impeller blade having the same structure. Background Technology

[0002] In recent years, with the deepening of human exploration of nature, biomimetic surface drag reduction and noise reduction technology has developed rapidly and been widely applied. Among them, fish, due to their speed and stealth in water, have become an important research object in biomimetic drag reduction and noise reduction. The reason why fish have the characteristics of fast and flexible swimming is closely related to the surface structure of various regions of their body, 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 hyperboloid fish scale biomimetic structure and an impeller blade with it. Based on the flow control of biomimetic surface structure couplers, the flow characteristics of the blade surface are improved, the flow resistance is reduced, and the noise generation is reduced. Summary of the Invention

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

[0004] To achieve the above objectives, this invention proposes a flow control method based on a hyperboloid fish-scale biomimetic 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 tip c, the blade root d, the suction surface e and the pressure surface f on both sides of the blade body, and fish scale areas g with multiple fish scale biomimetic structural couplers arranged in a regular pattern on the suction surface e and the pressure surface f.

[0006] S2. The design and construction of a single fish-scale biomimetic structural element includes a bottom surface that conforms to the blade surface and a top surface with a fish-scale structure. The top surface includes a folded hexagonal surface whose endpoints coincide with the bottom surface. The side length of the regular hexagonal surface projected from the folded hexagonal surface is l. h =l, and three grooves parallel to the edge. The endpoint O of the fold line of the folded hexagonal surface is defined as the front endpoint of the fish scale bionic structural coupler. A spatial rectangular coordinate system is established with point O as the origin, and the fish scale bionic structural coupler is constructed in the spatial rectangular coordinate system.

[0007] S3. Establish multiple fish scale biomimetic structure arrangement rules, and construct the overall fish scale biomimetic structure by arranging multiple fish scale biomimetic structure couplers in each fish scale area according to the arrangement rules.

[0008] This invention, based on the control of flow through biomimetic structures, can improve the fluid flow characteristics on the blade surface and reduce noise generation.

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

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

[0011] S21. Define a regular hexagonal surface OH1H2H3H4H5 on a plane that forms an angle ∠H3OA=α with the xy-plane of the rectangular coordinate system. 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 as the intersection point of the edge H3A of the regular hexagonal prism and the xy-plane.

[0012] S22. Using H3O as the axis of rotation, 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 the broken line P of the broken line F2F1OF5F4 parallel to its edge in space. n_1 P n_3 P n_5 P n_4 P n_2 and broken line P n_9 P n_7 P n_6 P n_8 P n_10 Confirmed. The broken line F2F1OF5F4 and the broken line P... 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 broken line P n_9 P n_ 7P n_6 P n_8 P n_10 The vertical distance, i.e. the trench 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 broken line 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 surfaces 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 surfaces 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] Furthermore, according to step S2, for P n_j The coordinates 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] 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 The coordinates x n_j_1 y n_j_1 z n_j_1 They are (n = 1, 2, 3; j = 1, 2):

[0016]

[0017] 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 The coordinates x n_j_2 ,

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

[0019]

[0020] Point P n_5 =(xn_5 y n_5 , z n_5 The coordinates x n_5 y n_5 z n_5 They are (n=1,2,3):

[0021]

[0022] y n_5 =0;

[0023]

[0024] Point P n_6 =(x n_6 y n_6 , z n_6 The coordinates x n_6 y n_6 z n_6 They are (n=1,2,3):

[0025]

[0026] y n_6 =0;

[0027]

[0028] 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 The coordinates x n_j_3 y n_j_3 z n_j_3 They are (n = 1, 2, 3; j = 7, 8):

[0029]

[0030] 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 The coordinates x n_j_4 y n_j_4 z n_j_4 They are (n = 1, 2, 3; j = 9, 10):

[0031]

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

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

[0034] S31. Flatten the suction surface r or pressure surface f, keeping each fish scale area g in a flat state;

[0035] S32. Establish a Cartesian coordinate system with the first complete fish scale biomimetic structural element closest to the leaf root d in the first row as the origin, and denote the first endpoint of each fish scale biomimetic structural element as O. i,j Where i represents the row number, j represents the row inner element number, and O i,j = (x, y), where the coordinates x and y are respectively:

[0036] x=0.75·l·(i-1)i=1,2,3,...;

[0037]

[0038] Furthermore, the coverage area of ​​the fish scale zone is designed such that the length of the fish scale zone g along the flow direction accounts for 20%-80% of the total blade length, and the width of the fish scale zone g is set to be equal to the blade width.

[0039] The present invention also provides a hyperboloid fish scale biomimetic structure coupler made using the flow control method described above, including a bottom surface that fits the blade surface, a top surface with 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 endpoints coincide with the bottom surface. The side length of the regular hexagonal surface after projection of the folded hexagonal surface is l. h =l, and three grooves parallel to the edge, the width of which is l. w =w, depth l d =d; the vertical distance between the trenches is l g =g;

[0041] The base is hexagonal, and each side is the intersection of the lateral surface of a prism formed by regular hexagonal surfaces OH1H2H3H4H5 and the xy plane.

[0042] The present invention also provides a biomimetic impeller blade made using the hyperboloid fish scale biomimetic structural coupler as described above, including a leading edge a, a trailing edge b, a top edge c, a 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 biomimetic structural couplers arranged in a regular manner on both the suction surface e and the pressure surface f.

[0043] Furthermore, the length of the fish scale region g along the flow direction accounts for 20%-80% of the total blade length, and the width of the fish scale region g is set to be equal to the blade width.

[0044] The present invention also provides an impeller made using the biomimetic impeller blades described above, comprising an impeller body, wherein a plurality of biomimetic impeller blades are provided on the impeller body, and the number of biomimetic impeller blades is set to 3-20.

[0045] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0046] 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 taken in conjunction with the accompanying drawings, wherein:

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

[0048] Figure 2 This is a schematic diagram of a fish-scale biomimetic structure coupler designed according to another flow control method based on a hyperboloid fish-scale biomimetic structure according to the present invention.

[0049] Figure 3 This is a schematic diagram of the arrangement of fish-scale biomimetic structure couplers in a flow control method based on a hyperboloid fish-scale biomimetic structure according to the present invention. Detailed Implementation

[0050] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. 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.

[0051] This invention provides a flow control method based on a hyperboloid fish scale biomimetic structure, comprising the following steps:

[0052] S1. Construct the main structure of the impeller blade, including the blade leading edge a, the blade trailing edge b, the blade tip c, the blade root d, the suction surface e and the pressure surface f on both sides of the blade body, and fish scale areas g with multiple fish scale biomimetic structural couplers arranged in a regular pattern on the suction surface e and the pressure surface f.

[0053] S2. The design and construction of a single fish-scale biomimetic structural element includes a bottom surface that conforms to the blade surface and a top surface with a fish-scale structure. The top surface includes a folded hexagonal surface whose endpoints coincide with the bottom surface. The side length of the regular hexagonal surface projected from the folded hexagonal surface is l. h =l, and three grooves parallel to the edge. The endpoint O of the fold line of the folded hexagonal surface is defined as the front endpoint of the fish scale bionic structural coupler. A spatial rectangular coordinate system is established with point O as the origin, and the fish scale bionic structural coupler is constructed in the spatial rectangular coordinate system.

[0054] S3. Establish multiple fish scale biomimetic structure arrangement rules, and construct the overall fish scale biomimetic structure by arranging multiple fish scale biomimetic structure couplers in each fish scale area according to the arrangement rules.

[0055] This invention is based on the control of flow by biomimetic structures. It designs an impeller blade with a fish scale region composed of multiple fish scale biomimetic structural couplers, so that the surface of the impeller blade can have a fish scale biomimetic structure, which can improve the fluid flow characteristics on the blade surface and reduce noise generation.

[0056] In some embodiments, during S1, when constructing the main structure of the impeller blade, the thickness δ of the trailing edge b of the blade ranges from 1 to 50 mm, and the length k of the trailing edge b of the blade ranges from 1 to 50 mm.

[0057] In some embodiments, S3, constructing a single fish scale biomimetic structure includes the following steps:

[0058] S21. Define a regular hexagonal surface OH1H2H3H4H5 on a plane that forms an angle ∠H3OA=α with the xy-plane of the rectangular coordinate system. 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 as the intersection point of the edge H3A of the regular hexagonal prism and the xy-plane.

[0059] S22. Using H3O as the axis of rotation, 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 the broken line P of the broken line F2F1OF5F4 parallel to its edge in space. n_1P n_3 P n_5 P n_4 P n_2 and broken line P n_9 P n_7 P n_6 P n_8 P n_10 Confirmed. The broken line F2F1OF5F4 and the broken line P... 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 broken line P n_9 P n_ 7P n_6 P n_8 P n_10 The vertical distance, i.e. the trench 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 broken line 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 surfaces 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 surfaces 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 coordinates 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] Point 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 The coordinates x n_j_1 y n_j_1 z n_j_1 They are (n = 1, 2, 3; j = 1, 2):

[0063]

[0064] 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 The coordinates x n_j_2 ,

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

[0066]

[0067] Point P n_5 =(x n_5 y n_5 , z n_5 The coordinates x n_5 y n_5 z n_5 They are (n=1,2,3):

[0068]

[0069] y n_5 =0;

[0070]

[0071] Point P n_6 =(x n_6 y n_6 , z n_6 The coordinates x n_6 y n_6 z n_6 They are (n=1,2,3):

[0072]

[0073] y n_6 =0;

[0074]

[0075] 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 The coordinates x n_j_3 y n_j_3 z n_j_3 They are (n = 1, 2, 3; j = 7, 8):

[0076]

[0077] 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 The coordinates 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 step S21, ∠H3OA=α ranges from 0 to 10°, and the angle β between the flow surface I and the xy plane ranges from 0 to 5°. The distance g ranges from... The range of values ​​for distance w

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

[0081] S31. Flatten the suction surface r or pressure surface f, keeping each fish scale area g in a flat state;

[0082] S32. Establish a Cartesian coordinate system with the first complete fish scale biomimetic structural element closest to the leaf root d in the first row as the origin, and denote the first endpoint of each fish scale biomimetic structural element as O. i,j Where i represents the row number, j represents the row inner element number, and O i,j = (x, y), where the coordinates x and y are respectively:

[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 biomimetic structural coupler in the flattened state of the fish scale region g is only a arrangement rule and does not mean that the fish scale region g must be a flat plane. The impeller blade itself can have a certain curvature, that is, the surface of the fish scale region g can also have a certain curvature, rather than being flat. However, the arrangement of the fish scale region g in the flattened state still conforms to the above-mentioned rules for the arrangement of multiple fish scale biomimetic structures.

[0086] In some embodiments, the coverage area of ​​the fish-scale region is designed such that the length of the fish-scale region g along the flow direction accounts for 20%-80% of the total blade length, and the width of the fish-scale region g is set to be equal to the blade width. This ensures that the fish-scale region g has sufficient coverage area on the blade surface to achieve the technical effects of improving the fluid flow characteristics of the blade surface and reducing noise.

[0087] The present invention also provides a hyperboloid fish scale biomimetic structure coupler fabricated using the flow control method described above, including a bottom surface that fits the blade surface, a top surface with a fish scale structure, and a prism side surface that connects the bottom surface and the top surface.

[0088] The top surface includes a folded hexagonal surface whose endpoints coincide with the bottom surface. The side length of the regular hexagonal surface after projection of the folded hexagonal surface is l. h =l, and three grooves parallel to the edge, the width of which is l. w =w, depth l d =d; the vertical distance between the trenches is l g =g;

[0089] The base is hexagonal, and each side is the intersection of the lateral surface of a prism formed by regular hexagonal surfaces OH1H2H3H4H5 and the xy plane.

[0090] The present invention also provides a biomimetic impeller blade made using the hyperboloid fish scale biomimetic structural coupler described above, including a leading edge a, a trailing edge b, a top edge c, a 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 biomimetic structural couplers arranged in a regular pattern on both the suction surface e and the pressure surface f.

[0091] In some embodiments, the length of the fish-scale region g along the flow direction accounts for 20%-80% of the total blade length, and the width of the fish-scale region g is set to be equal to the blade width. This ensures that the fish-scale region g has sufficient coverage area on the blade surface to achieve the technical effects of improving the fluid flow characteristics of the blade surface and reducing noise.

[0092] In some embodiments, the thickness δ of the trailing edge b of the blade ranges from 1 to 50 mm, and the length k of the trailing edge b of the blade ranges from 1 to 50 mm.

[0093] The present invention also provides an impeller made using the biomimetic impeller blades described in any of the above claims, comprising an impeller body, wherein a plurality of biomimetic impeller blades are provided on the impeller body, and the number of biomimetic impeller blades is set to 3-20.

[0094] 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.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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. A flow control method based on a hyperboloid fish scale biomimetic structure, characterized in that, Includes the following steps: S1. Construct the main structure of the impeller blade, including the blade leading edge a, the blade trailing edge b, the blade tip c, the blade root d, the suction surface e and the pressure surface f on both sides of the blade body, and fish scale areas g with multiple fish scale biomimetic structural couplers arranged in a regular pattern on the suction surface e and the pressure surface f. S2. The design and construction of a single fish-scale biomimetic structural element includes a bottom surface that conforms to the blade surface and a top surface with a fish-scale structure. The top surface includes a folded hexagonal surface whose endpoints coincide with the bottom surface. The side length of the projected regular hexagonal surface after the folded hexagonal surface is... l h = l And three grooves parallel to the edge. The endpoint O of the fold line of the folded hexagonal surface is defined as the front endpoint of the fish scale biomimetic structural coupler. A spatial rectangular coordinate system is established with point O as the origin, and the fish scale biomimetic structural coupler is constructed in the spatial rectangular coordinate system. S3. Establish multiple fish scale biomimetic structure arrangement rules, and construct the fish scale biomimetic structure as a whole in each fish scale area according to the arrangement rules for multiple fish scale biomimetic structure couplers. In step S2, constructing a single fish scale biomimetic structure includes the following steps: S21. Define a regular hexagonal surface OH1H2H3H4H5 on a plane that forms an angle ∠H3OA=α with the xy plane of the spatial rectangular coordinate system. O, H1, H2, H3, H4, and H5 are the six endpoints of the regular hexagon. The regular hexagonal surface OH1H2H3H4H5 is the base, and A is the intersection of the edge H3A of the regular hexagonal prism and the xy plane. S22. Using H3O as the axis of rotation, 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. The range of values ​​for ∠H3OA=α is: The angle β between the flow surface I and the xy plane ranges from 1 to 1. .

2. The flow control method based on a hyperboloid fish scale biomimetic structure as described in claim 1, characterized in that, In S1, when constructing the main structure of the impeller blade, the thickness of the trailing edge b of the blade is... δ The range is 1-50 mm, and the length of the trailing edge b of the blade is... k The range is 1-50mm.

3. The flow control method based on a hyperboloid fish scale biomimetic structure as described in claim 1, characterized in that, On the folded hexagonal surface OF1F2F3F4F5, the nth groove is formed by the broken line P of the broken line F2F1OF5F4 parallel to its edge in space. n_ 1P n_3 P n_5 P n_4 P n_2 and broken line P n_9 P n_7 P n_6 P n_8 P n_10 It is confirmed that n=1, 2, 3; the broken line F2F1OF5F4 and the broken line P 1_1 P 1_ 3P 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 broken line P n_9 P n_7 P n_6 P n_8 P n_10 The vertical distance, i.e., the width of the trench, is l w_1 =w ;P (broken line) n_1 P n_3 P n_5 P n_4 P n_2 With the broken line 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 surfaces OF1F2F3, the depth of the trench is... l dn_1 = d Parallel to surfaces OF3F4F5, the depth of the trench is... l dn_2 = d .

4. The flow control method based on a hyperboloid fish scale biomimetic structure as described in claim 3, characterized in that, right P n_j The coordinates are determined as follows: n = 1, 2, 3; j = 1, 2, 3, ... 8, 9, 10. 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 coordinates of) x n_j_1 , y n_j_1 , z n_j_1 They are respectively: ； ； ； The n=1, 2, 3; the 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 coordinates of) x n_j_2 , y n_j_2 , z n_j_2 They are respectively: ； ； ； The values ​​n = 1, 2, 3; The values ​​j=3, 4; point P n_5 =( x n_5 , y n_5 , z n_5 coordinates of) x n_5 , y n_5 , z n_5 They are respectively: ； ； ； The values ​​n = 1, 2, 3; point P n_6 =( x n_6 , y n_6 , z n_6 coordinates of) x n_6 , y n_6 , z n_6 They are respectively: ； ； ； The values ​​n = 1, 2, 3; 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 coordinates of) x n_j_3 , y n_j_3 , z n_j_3 They are respectively: ； ； ； The values ​​of n are 1, 2, 3; and the values ​​of j are 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 coordinates of) x n_j_4 , y n_j_4 , z n_j_4 They are respectively: ； ； ； The values ​​n = 1, 2, 3; The values ​​j=9 and 10 are given.

5. The flow control method based on a hyperboloid fish scale biomimetic structure as described in claim 4, characterized in that, distance g The range of values ,distance w The range of values .

6. The flow control method based on a hyperboloid fish scale biomimetic structure as described in claim 1, characterized in that, In S3, the arrangement rules of the multiple fish scale biomimetic structures include: S31. Flatten the suction surface e or the pressure surface f, keeping each fish scale area g in a flat state; S32. Establish a Cartesian coordinate system with the first complete fish scale biomimetic structural element closest to the leaf root d in the first row as the origin, and denote the first endpoint of each fish scale biomimetic structural element as O. i,j Where i represents the row number and j represents the element number within the row. O i,j =( x , y ), coordinate values x , y They are respectively: ； 。 7. A flow control method based on a hyperboloid fish-scale biomimetic structure as described in any one of claims 1-6, characterized in that, The coverage area of ​​the fish scale zone is designed such that the length of the fish scale zone g along the flow direction accounts for 20%-80% of the total blade length, and the width of the fish scale zone g is set to be equal to the blade width.

8. A hyperboloid fish-scale biomimetic structural coupler fabricated using the flow control method as described in claim 7, characterized in that, This includes the bottom surface that fits against the blade surface, the top surface with a fish-scale structure, and the prism-shaped side surface that connects the bottom and top surfaces; The top surface includes a folded hexagonal surface whose endpoints coincide with the bottom surface. The side length of the regular hexagonal surface projected from the folded hexagonal surface is... l h = l And three grooves parallel to the edge, the width of which is l w = w Depth is l d = d The vertical distance between the trenches is l g = g ; The base is hexagonal, and each side is the intersection of the lateral surface of a prism formed by regular hexagonal surfaces OH1H2H3H4H5 and the xy plane.

9. A biomimetic impeller blade made using the hyperboloid fish-scale biomimetic structural coupler as described in claim 8, characterized in that, It includes the leading edge a, trailing edge b, tip c, root d, suction surface e and pressure surface f on both sides of the blade body. On both suction surface e and pressure surface f, there are fish scale areas g with multiple fish scale biomimetic structural couplers arranged in a regular pattern.

10. The biomimetic impeller blade as described in claim 9, characterized in that, The length of the fish scale region g along the flow direction accounts for 20%-80% of the total blade length, and the width of the fish scale region g is set to be equal to the blade width.

11. An impeller made using the biomimetic impeller blades as described in any one of claims 9-10, characterized in that, It includes an impeller body, on which multiple biomimetic impeller blades are provided, with the number of biomimetic impeller blades ranging from 3 to 20.

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