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

Abstract

The application provides a flow control method based on three-curved-surface fish scale bionic structure, comprising 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 regularly are 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 adhering to a blade surface, a top surface in a fish scale structure, and a rear side cylindrical surface; the top surface comprises two groups of parallel fold surfaces, and each group of fold surfaces is composed of three quadrilateral surfaces; a space rectangular coordinate system is established with a front end point of the bottom surface as an 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 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 tri-curved 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 tri-curved 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 tri-curved fish-scale biomimetic structure, comprising the following steps:

[0005] S1. Construct the main structure of the impeller blade, including 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. Fish scale area g with multiple fish scale biomimetic structural couplers are set on suction surface e and pressure surface f.

[0006] S2. The design and construction of a single fish-scale biomimetic structural element includes a bottom surface that adheres to the blade surface and a top surface with a fish-scale structure. The top surface includes two sets of parallel folded surfaces, each set consisting of three connected quadrilateral faces. The front side length of the bottom surface is l. f =2w, the midpoint of the front side (the front end point of the bottom surface) O is defined as the front end point of the fish scale bionic structure coupler. A spatial rectangular coordinate system is established with point O as the origin, and the fish scale bionic structure 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 S2, constructing a single fish scale biomimetic structure includes the following steps:

[0011] S21. The first set of folds is created by using the y-axis as the rotation axis, and forming a plane with an angle of ∠P to the xy-plane. 1_3 Q 1_2 Q 1_3 Define a trapezoidal surface P on the plane of α. 1_1 P 1_2 P 1_3 P 1_4 P 1_1 P 1_2 P 1_3 P 1_4 The four endpoints of the trapezoid; the midpoint of the front side of the base and line P 1_1 P 1_2 The midpoints coincide; in the xy plane, P 1_1 Create a straight line P parallel to the x-axis, with the endpoint as the endpoint. 1_ 1P 1_5 ; with line P 1_1 P 1_5 The axis of rotation is at an angle ∠P with respect to the xy plane. 1_3 Q 1_1 Q 1_3 Define a trapezoidal surface P on the plane of β. 1_1 P 1_ 3P 1_5 P 1_7 P 1_1 P 1_3 P 1_5 P 1_7 The four endpoints of the trapezoidal surface are defined by the xz plane as its symmetry plane and the line P. 1_2 P 1_6 Create a pivot point on trapezoidal surface P. 1_1 P 1_3 P 1_5 P 1_7 Symmetrical trapezoidal surface P 1_2 P 1_4 P 1_6 P 1_8 P 1_2 P 1_4 P 1_6 P 1_8 The four endpoints of the trapezoidal surface are represented by line P. 1_1 P 1_3 With line P 1_2 P1_4 For the connecting line, surface P 1_2 P 1_4 P 1_6 P 1_8 With surface P 1_1 P 1_2 P 1_3 P 1_4 With surface P 1_ 1P 1_3 P 1_5 P 1_7 Form the first group of folded surfaces; surface P 1_7 P 1_3 P 1_4 P 1_8 Parallel to the xy plane, perpendicular distance l h1 =h;

[0012] S22, on face P 1_7 P 1_3 P 1_4 P 1_8 Inside, with the broken line P 1_7 P 1_3 P 1_4 P 1_8 Create an equidistant polyline P inward from the baseline. 2_ 5P 2_1 P 2_2 P 2_6 equidistant distance l d =d; Similar to the first group of facets, the second group of facets is created by: on face P 2_5 P 2_ 1P 2_2 P 2_6 Presented by ∠P 2_3 Q 2_2 Q 2_3 Define a trapezoidal surface P on the plane of α. 2_1 P 2_2 P 2_3 P 2_4 P 2_1 P 2_2 P 2_3 P 2_4 The four endpoints of the trapezoid are P; 2_1 Create a straight line P parallel to the x-axis, with the endpoint as the endpoint. 2_1 P 2_5 ; with line P 2_1 P 2_5 As the axis of rotation, on plane P 2_5 P 2_1 P 2_2 P 2_6 Presented by ∠P 2_3 Q 2_1 Q 2_3 Define a trapezoidal surface P on the plane of β.2_1 P 2_3 P 2_5 P 2_7 P 2_1 P 2_3 P 2_5 P 2_7 The four endpoints of the trapezoidal surface are defined by the xz plane as its symmetry plane and the line P. 2_2 P 2_6 Create a pivot point on trapezoidal surface P. 2_1 P 2_3 P 2_ 5P 2_7 Symmetrical trapezoidal surface P 2_2 P 2_4 P 2_6 P 2_8 P 2_2 P 2_4 P 2_6 P 2_8 The four endpoints of the trapezoidal surface are represented by line P. 2_1 P 2_3 With line P 2_2 P 2_4 For the connecting line, surface P 2_2 P 2_4 P 2_6 P 2_8 With surface P 2_1 P 2_2 P 2_3 P 2_4 With surface P 2_1 P 2_3 P 2_5 P 2_7 Form the second group of folded surfaces; surface P 2_7 P 2_3 P 2_4 P 2_8 Parallel to the xy plane, perpendicular distance l h2 =2h.

[0013] The rear cylindrical surface is created as follows: In the xy-plane, at endpoint A of line OA of length l parallel to the x-axis, create an arc BCD with A as the center and length r as the radius. Line AC is parallel to line OA, and ∠BAD = γ. Tangents BP to arc BCD are then created from endpoints B and D respectively. 1_6 DP with tangent 1_5 Parallel to the z-axis, with line P 1_6 BCDP 1_5 A spatial cylindrical surface is created for the generatrix, intersecting with the first set of folded surfaces and the second set of folded surfaces as described in claim 3, to obtain the rear cylindrical surface P. 1_6 P 1_ 8P 2_6 P 2_8 P2_7 P 2_5 P 1_7 P 1_5 DCB.

[0014] Furthermore, according to step S2, for P n_j The coordinates of (n = 1, 2; j = 1, 2, 3, ..., 6, 7, 8) are determined. Since the feature is symmetrical with respect to the xz plane, 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; j=1,2):

[0016]

[0017] z n_j_1 = (n-1)·h;

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

[0019]

[0020] z n_j_2 =h + (n-1)·h;

[0021] Point P n_5 =(x n_5_3 y n_5_3 , z n_5_3 ) and P n_6 =(x n_6_3 y n_6_3 , z n_6_3 The coordinates x n_j_3 y n_j_3 z n_j_3 They are (n=1,2; j=5,6):

[0022]

[0023] z n_j_3 = (n-1)·h;

[0024] Point P n_7 =(x n_7_4 y n_7_4 , z n_7_4 ) and point P n_8 =(x n_8_4 y n_8_4 , z n_8_4 The coordinates x n_j_4 y n_j_4 z n_j_4 They are (n=1,2; j=7,8):

[0025]

[0026] z n_j_4 =h+(n-1)·h.

[0027] Furthermore, the range of α is 0 < α < 5°, the range of β is 0 < β ≤ 5°, and the range of distance h is... In S22, the range of values ​​for distance d is...

[0028] Furthermore, the range of ∠BAD=γ is 30°<γ≤90°.

[0029] Furthermore, in S3, the arrangement rules of the multiple fish scale biomimetic structures include:

[0030] S31. Flatten the suction surface e or the pressure surface f, keeping each fish scale area g in a flat state;

[0031] 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:

[0032]

[0033] i = 1, 2, 3, ...;

[0034]

[0035] 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.

[0036] The present invention also provides a three-curved 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 rear cylindrical surface;

[0037] The top surface includes two sets of parallel folds, each set of folds being composed of three quadrilateral faces connected together;

[0038] The rear cylindrical surface is a decagonal surface formed by the intersection of a spatial cylindrical surface created by a generatrix composed of an arc and tangents emanating from its two endpoints, and the first set of folded surfaces and the second set of folded surfaces.

[0039] The base is hexagonal, with one side being an arc and the other five sides being straight lines.

[0040] The present invention also provides a biomimetic impeller blade made using the three-curved 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.

[0041] 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.

[0042] 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.

[0043] 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

[0044] 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:

[0045] Figure 1 A schematic diagram of a blade structure designed according to a flow control method based on a tri-curved fish-scale biomimetic structure according to the present invention;

[0046] Figure 2 This is a schematic diagram of a fish-scale biomimetic structure coupler designed according to another flow control method based on a three-curved fish-scale biomimetic structure according to the present invention.

[0047] Figure 3 This is a schematic diagram of the arrangement of fish-scale biomimetic structure couplers according to a flow control method based on a three-curved fish-scale biomimetic structure of the present invention. Detailed Implementation

[0048] 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.

[0049] This invention provides a flow control method based on a tri-curved fish-scale biomimetic structure, comprising the following steps:

[0050] S1. Construct the main structure of the impeller blade, including 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. Fish scale area g with multiple fish scale biomimetic structural couplers are set on suction surface e and pressure surface f.

[0051] S2. The design and construction of a single fish-scale biomimetic structural element includes a bottom surface that conforms to the blade surface, a top surface with a fish-scale structure, and a rear cylindrical surface. The top surface includes two sets of parallel folded surfaces, each set consisting of three connected quadrilateral faces. The front side of the bottom surface has a length of l. f =2w, the midpoint of the front side (the front end point of the bottom surface) O is defined as the front end point of the fish scale bionic structure coupler. A spatial rectangular coordinate system is established with point O as the origin, and the fish scale bionic structure coupler is constructed in the spatial rectangular coordinate system.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] In some embodiments, S2, constructing a single fish scale biomimetic structure includes the following steps:

[0056] S21. The first set of folds is created by using the y-axis as the rotation axis, and forming a plane with an angle of ∠P to the xy-plane. 1_3 Q 1_2 Q 1_3 Define a trapezoidal surface P on the plane of α. 1_1 P 1_2 P 1_3 P 1_4 P 1_1 P 1_2 P 1_3 P 1_4 The four endpoints of the trapezoid; the midpoint of the front side of the base and line P 1_1 P 1_2 The midpoints coincide; in the xy plane, P 1_1 Create a straight line P parallel to the x-axis, with the endpoint as the endpoint. 1_ 1P 1_5 ; with line P 1_1 P 1_5 The axis of rotation is at an angle ∠P with respect to the xy plane. 1_3 Q 1_1 Q 1_3 Define a trapezoidal surface P on the plane of β. 1_1 P 1_ 3P 1_5 P 1_7 P 1_1 P 1_3 P 1_5 P 1_7 The four endpoints of the trapezoidal surface are defined by the xz plane as its symmetry plane and the line P. 1_2 P 1_6 Create a pivot point on trapezoidal surface P. 1_1 P 1_3 P 1_5 P 1_7 Symmetrical trapezoidal surface P 1_2 P 1_4 P 1_6 P 1_8 P 1_2 P 1_4 P 1_6 P 1_8 The four endpoints of the trapezoidal surface are represented by line P. 1_1 P 1_3 With line P 1_2 P 1_4 For the connecting line, surface P 1_2 P 1_4 P 1_6 P 1_8 With surface P 1_1 P 1_2 P 1_3 P 1_4 With surface P 1_ 1P 1_3P 1_5 P 1_7 Form the first group of folded surfaces; surface P 1_7 P 1_3 P 1_4 P 1_8 Parallel to the xy plane, perpendicular distance l h1 =h;

[0057] S22, on face P 1_7 P 1_3 P 1_4 P 1_8 Inside, with the broken line P 1_7 P 1_3 P 1_4 P 1_8 Create an equidistant polyline P inward from the baseline. 2_ 5P 2_1 P 2_2 P 2_6 equidistant distance l d =d; Similar to the first group of facets, the second group of facets is created by: on face P 2_5 P 2_ 1P 2_2 P 2_6 Presented by ∠P 2_3 Q 2_2 Q 2_3 Define a trapezoidal surface P on the plane of α. 2_1 P 2_2 P 2_3 P 2_4 P 2_1 P 2_2 P 2_3 P 2_4 The four endpoints of the trapezoid are P; 2_1 Create a straight line P parallel to the x-axis, with the endpoint as the endpoint. 2_1 P 2_5 ; with line P 2_1 P 2_5 As the axis of rotation, on plane P 2_5 P 2_1 P 2_2 P 2_6 Presented by ∠P 2_3 Q 2_1 Q 2_3 Define a trapezoidal surface P on the plane of β. 2_1 P 2_3 P 2_5 P 2_7 P 2_1 P 2_3 P 2_5 P 2_7 The four endpoints of the trapezoidal surface are defined by the xz plane as its symmetry plane and the line P. 2_2 P 2_6Create a pivot point on trapezoidal surface P. 2_1 P 2_3 P 2_ 5P 2_7 Symmetrical trapezoidal surface P 2_2 P 2_4 P 2_6 P 2_8 P 2_2 P 2_4 P 2_6 P 2_8 The four endpoints of the trapezoidal surface are represented by line P. 2_1 P 2_3 With line P 2_2 P 2_4 For the connecting line, surface P 2_2 P 2_4 P 2_6 P 2_8 With surface P 2_1 P 2_2 P 2_3 P 2_4 With surface P 2_1 P 2_3 P 2_5 P 2_7 Form the second group of folded surfaces; surface P 2_7 P 2_3 P 2_4 P 2_8 Parallel to the xy plane, perpendicular distance l h2 =2h;

[0058] In some embodiments, the rear cylindrical surface is created as follows: In the xy-plane, at endpoint A of line OA of length l parallel to the x-axis, an arc BCD is created with A as the center and length r as the radius. Line AC is parallel to line OA, and ∠BAD = γ. Tangents BP to arc BCD are created at endpoints B and D respectively. 1_6 DP with tangent 1_5 Parallel to the z-axis, with line P 1_6 BCDP 1_5 A spatial cylindrical surface is created for the generatrix, intersecting with the first set of folded surfaces and the second set of folded surfaces as described in claim 3, to obtain the rear cylindrical surface P. 1_6 P 1_8 P 2_6 P 2_8 P 2_7 P 2_5 P 1_7 P 1_5 DCB.

[0059] In some embodiments, according to step S2, P n_jThe coordinates of (n = 1, 2; j = 1, 2, 3, ..., 6, 7, 8) are determined. Since the feature is symmetrical with respect to the xz plane, the coordinates of each point are as follows:

[0060] 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; j=1,2):

[0061]

[0062] z n_j_1 = (n-1)·h;

[0063] 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 y n_j_2 z n_j_2 They are (n=1,2; j=3,4):

[0064]

[0065] z n_j_2 =h + (n-1)·h;

[0066] Point P n_5 =(x n_5_3 y n_5_3 , z n_5_3 ) and P n_6 =(x n_6_3 y n_6_3 , z n_6_3 The coordinates x n_j_3 y n_j_3 z n_j_3 They are (n=1,2; j=5,6):

[0067]

[0068] z n_j_3 = (n-1)·h;

[0069] Point Pn_7 =(x n_7_4 y n_7_4 , z n_7_4 ) and point P n_8 =(x n_8_4 y n_8_4 , z n_8_4 The coordinates x n_j_4 y n_j_4 z n_j_4 They are (n=1,2; j=7,8):

[0070]

[0071] z n_j_4 =h+(n-1)·h.

[0072] In some embodiments, in S21, α takes values ​​ranging from 0 to 5°, β takes values ​​ranging from 0 to 5°, and the distance h takes values ​​ranging from... In S22, the range of values ​​for distance d is...

[0073] In some embodiments, the value of ∠BAD=γ ranges from 30°<γ≤90°.

[0074] In some embodiments, the arrangement rules of the multiple fish scale biomimetic structures in S3 include:

[0075] S31. Flatten the suction surface e or the pressure surface f, keeping each fish scale area g in a flat state;

[0076] 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:

[0077]

[0078] i = 1, 2, 3, ...;

[0079]

[0080] 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.

[0081] 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.

[0082] The present invention also provides a three-curved 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 rear cylindrical surface;

[0083] The top surface includes two sets of parallel folds, each set of folds being composed of three quadrilateral faces connected together;

[0084] The rear cylindrical surface is a decagonal surface formed by the intersection of a spatial cylindrical surface created by a generatrix composed of an arc and tangents emanating from its two endpoints, and the first set of folded surfaces and the second set of folded surfaces.

[0085] The base is hexagonal, with one side being an arc and the other five sides being straight lines.

[0086] The present invention also provides a biomimetic impeller blade made using the above-described three-curved fish scale biomimetic structural coupler, 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 fish scale areas g with multiple fish scale biomimetic structural couplers arranged in a regular pattern on both the suction surface e and the pressure surface f.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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 tri-curved 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, a top surface with a fish-scale structure, and a rear cylindrical surface; the top surface includes two sets of parallel folded surfaces, each set of folded surfaces being composed of three quadrilateral faces connected together; the front side of the bottom surface has a length of l. f =2w, the midpoint O of the front side length is defined as the front endpoint of the fish scale bionic structure coupler, a spatial rectangular coordinate system is established with point O as the origin, and the fish scale bionic structure 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. The first set of folds is created by using the y-axis as the rotation axis, and forming a plane with an angle of ∠P to the xy-plane. 1_3 Q 1_2 Q 1_3 Define a trapezoidal surface P on the plane of α. 1_1 P 1_2 P 1_3 P 1_4 P 1_1 P 1_2 P 1_3 P 1_4 The four endpoints of the trapezoid; the midpoint of the front side of the base and line P 1_1 P 1_2 The midpoints coincide; in the xy plane, P 1_1 Create a straight line P parallel to the x-axis, with the endpoint as the endpoint. 1_ 1P 1_5 ; with line P 1_1 P 1_5 The axis of rotation is at an angle ∠P with respect to the xy plane. 1_3 Q 1_1 Q 1_3 Define a trapezoidal surface P on the plane of β. 1_1 P 1_ 3P 1_5 P 1_7 P 1_1 P 1_3 P 1_5 P 1_7 The four endpoints of the trapezoidal surface are defined by the xz plane as its symmetry plane and the line P. 1_2 P 1_6 Create a pivot point on trapezoidal surface P. 1_1 P 1_3 P 1_5 P 1_7 Symmetrical trapezoidal surface P 1_2 P 1_4 P 1_6 P 1_8 P 1_2 P 1_4 P 1_6 P 1_8 The four endpoints of the trapezoidal surface are represented by line P. 1_1 P 1_3 With line P 1_2 P 1_4 For the connecting line, surface P 1_2 P 1_4 P 1_6 P 1_8 With surface P 1_1 P 1_2 P 1_3 P 1_4 With surface P 1_ 1P 1_3 P 1_5 P 1_7 Form the first group of folded surfaces; surface P 1_7 P 1_3 P 1_4 P 1_8 Parallel to the xy plane, perpendicular distance l h1 =h; S22, on face P 1_7 P 1_3 P 1_4 P 1_8 Inside, with the broken line P 1_7 P 1_3 P 1_4 P 1_8 Create an equidistant polyline P inward from the baseline. 2_5 P 2_ 1P 2_2 P 2_6 equidistant distance l d =d; Similar to the first group of facets, the second group of facets is created by: on face P 2_5 P 2_1 P 2_ 2P 2_6 Presented by ∠P 2_3 Q 2_2 Q 2_3 Define a trapezoidal surface P on the plane of α. 2_1 P 2_2 P 2_3 P 2_4 P 2_1 P 2_2 P 2_3 P 2_4 The four endpoints of the trapezoid are P; 2_1 Create a straight line P parallel to the x-axis, with the endpoint as the endpoint. 2_1 P 2_5 ; with line P 2_1 P 2_5 As the axis of rotation, on plane P 2_ 5P 2_1 P 2_2 P 2_6 Presented by ∠P 2_3 Q 2_1 Q 2_3 Define a trapezoidal surface P on the plane of β. 2_1 P 2_3 P 2_5 P 2_7 P 2_1 P 2_3 P 2_5 P 2_7 The four endpoints of the trapezoidal surface are defined by the xz plane as its symmetry plane and the line P. 2_2 P 2_6 Create a pivot point on trapezoidal surface P. 2_1 P 2_3 P 2_5 P 2_7 Symmetrical trapezoidal surface P 2_2 P 2_4 P 2_6 P 2_8 P 2_2 P 2_4 P 2_6 P 2_8 The four endpoints of the trapezoidal surface are represented by line P. 2_1 P 2_3 With line P 2_ 2P 2_4 For the connecting line, surface P 2_2 P 2_4 P 2_6 P 2_8 With surface P 2_1 P 2_2 P 2_3 P 2_4 With surface P 2_1 P 2_3 P 2_5 P 2_7 Form the second group of folded surfaces; surface P 2_7 P 2_3 P 2_4 P 2_8 Parallel to the xy plane, perpendicular distance l h2 =2h; 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, j represents the row inner element number, and O i,j = (x, y), where the coordinates x and y are respectively:

2. The flow control method based on a tri-curved 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 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.

3. The flow control method based on a tri-curved fish-scale biomimetic structure as described in claim 2, characterized in that, The rear cylindrical surface is created as follows: In the xy plane, at endpoint A of line OA of length l parallel to the x-axis, create an arc BCD with A as the center and length r as the radius; line AC is parallel to line OA, ∠BAD = γ; with endpoints B and D as starting points, create tangents BP to arc BCD. 1_6 DP with tangent 1_5 ; Parallel to the z-axis, with line P 1_6 BCDP 1_5 Create a spatial cylindrical surface for the generatrix, intersecting with the first and second sets of folded surfaces to obtain the rear cylindrical surface P. 1_6 P 1_8 P 2_6 P 2_8 P 2_7 P 2_5 P 1_7 P 1_5 DCB.

4. The flow control method based on a tri-curved fish-scale biomimetic structure as described in claim 3, characterized in that, For P n_j The coordinates of (n = 1, 2; j = 1, 2, 3, ..., 6, 7, 8) are determined. Since the feature is symmetrical with respect to the xz plane, 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 The coordinates x n_j_1 y n_j_1 z n_j_1 They are (n=1,2; j=1,2): z n_j_1 =(n-1)·h; 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 y n_j_2 z n_j_2 They are (n=1,2; j=3,4): z n_j_2 =h+(n-1)·h; Point P n_5 =(x n_5_3 y n_5_3 , z n_5_3 ) and P n_6 =(x n_6_3 y n_6_3 , z n_6_3 The coordinates x n_j_3 y n_j_3 z n_j_3 They are (n=1,2; j=5,6): z n_j_3 =(n-1)·h; Point P n_7 =(x n_7_4 y n_7_4 , z n_7_4 ) and point P n_8 =(x n_8_4 y n_8_4 , z n_8_4 The coordinates x n_j_4 y n_j_4 z n_j_4 They are (n=1,2; j=7,8): z n_j_4 =h+(n-1)·h。 5. The flow control method based on a tri-curved fish-scale biomimetic structure as described in claim 4, characterized in that, In S21, α takes values ​​in the range of 0 < α < 5°, β takes values ​​in the range of 0 < β ≤ 5°, and the distance h takes values ​​in the range of... In S22, the range of values ​​for distance d is...

6. The flow control method based on a tri-curved fish-scale biomimetic structure as described in claim 5, characterized in that, The value of ∠BAD = γ ranges from 30° < γ ≤ 90°.

7. A flow control method based on a tri-curved 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 three-curved surface 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 adheres to the blade surface, the top surface with a fish-scale structure, and the rear cylindrical surface; The top surface includes two sets of parallel folds, each set of folds being composed of three quadrilateral faces connected together; The rear cylindrical surface is a decagonal surface formed by the intersection of a spatial cylindrical surface created by a generatrix composed of an arc and tangents emanating from its two endpoints, and the first set of folded surfaces and the second set of folded surfaces. The base is hexagonal, with one side being an arc and the other five sides being straight lines.

9. A biomimetic impeller blade made using the tri-curved 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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