Flow control method based on rhombic fish scale bionic structure and impeller blade with rhombic fish scale bionic structure

Abstract

The invention discloses a flow control method based on a rhombic fish scale bionic structure and an impeller blade with the rhombic fish scale bionic structure. The bionic impeller blade comprises a blade front edge, a blade rear edge, a blade suction surface and a blade pressure surface. By referring to the surface structure of a fish body, the surfaces of the two sides of each blade both comprise bionic fish scale areas. The bionic fish scale area is provided with bionic fish scale monomer structures which are arranged according to a certain rule, and the bionic fish scale monomer structures are closely arranged in a rhombus shape along the flow direction by referring to the arrangement mode of fish scales. The blade can effectively improve the flow characteristic of fluid on the surface of the blade, and has the advantages of reducing flow resistance, reducing generation and development of vortexes, reducing operation noise of hydraulic machinery and the like, so that the stability and durability of the blade are enhanced, and the impeller performance is improved.

Description

Technical Field

[0001] The present invention relates to the field of fluid machinery, and in particular to a flow control method based on a diamond-shaped 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 technology has made significant progress in reducing resistance and noise, and has been widely used in many fields. 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 rapid swimming and flexibility of fish are largely due to the unique surface structure of their body surface. The fish scale structured surface can improve the flow state of the turbulent boundary layer, thereby effectively reducing the water resistance and obtaining an extremely high swimming speed. Therefore, this patent proposes a flow control method based on a diamond fish scale bionic structure and an impeller blade having the same. Flow control based on the surface structure of the bionic fish scale area improves the fluid flow characteristics on the blade surface, reduces the generation and development of vortices, effectively reduces flow resistance, and thus reduces the noise generated by hydraulic machinery during operation, enhances blade stability and durability, and improves the performance of impeller blades. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a flow control method based on a diamond fish scale bionic structure and an impeller blade having the same, and to achieve flow control based on the surface structure arrangement of the bionic fish scale area.

[0004] In view of this, the first embodiment of the present invention is a flow control method based on a diamond fish scale bionic structure and an impeller blade having the same, characterized in that the blade is composed of a blade leading edge (a), a blade trailing edge (b) and a blade body. The blade body is characterized in that the blade suction surface (c) and the blade pressure surface (d) on both sides of the blade body include a bionic fish scale area (e), and a diamond fish scale bionic monomer structure (f) arranged in a certain pattern is arranged in the bionic fish scale area.

[0005] In one embodiment of the present invention, the number of the bionic blades is 5 to 8, the thickness of the trailing edge of the bionic blade is δ=1.5 to 3 mm, and the width of the trailing edge of the blade is b=10 to 15 mm.

[0006] In one embodiment of the present invention, the fish scale monomer structure comprises two symmetrically arranged front curved surfaces (I, II), two symmetrically arranged rear inclined planes (III, IV) and a lower surface (V). The intersection of the two front curved surfaces and the lower surface is defined as the front end point P of the bionic fish scale monomer structure. f The front end position is set to face the incoming flow direction, and the intersection of the two rear oblique planes and the lower surface is the rear end point P of the bionic fish scale monomer structure. bThe rear end point is set to face away from the incoming flow direction, and the two symmetrical intersections of the front curved surface, the rear inclined plane and the lower surface are respectively recorded as the upper end points P u With the lower end point P d The intersection point of the two front curved surfaces and the top of the two rear inclined planes is recorded as vertex P.

[0007] In one embodiment of the present invention, the two front curved surfaces (Ⅰ, Ⅱ) are curved triangles, the two rear oblique planes (Ⅲ, Ⅳ) are triangles, and the lower surface (V) is rhombus-shaped, with a side length of a1. The fish scale monomer structure is projected into a rhombus on the bottom surface where the lower surface is located, and the position of the vertex P on the projection point of the bottom surface where the lower surface is located is at 70%-80% of the long diagonal line of the rhombus, and the vertical distance from the vertex P to the lower surface is 0.3a1-0.4a1.

[0008] In one embodiment of the present invention, the projections of the two front curved surfaces (I, II) of the fish scale monomer on the bottom surface where the lower surface is located are straight lines P f P u , straight line P f P d , the intersection line of the front surface is arc PP f , in the shape of an arc. A spatial coordinate system is established with the intersection point O of the rhombus diagonal lines on the lower surface of the fish scale monomer structure as the origin. The curve equations constituting the two front side curved surfaces (Ⅰ, Ⅱ) conform to:

[0009]

[0010] In one embodiment of the present invention, the projections of the two rear oblique planes (III, IV) of the fish scale monomer on the bottom surface of the lower surface are respectively straight lines P b P u , straight line P b P d , the intersection line of the rear oblique plane is the straight line PP b The spatial coordinate system is established with the intersection point O of the diamond diagonal lines on the lower surface of the fish scale monomer structure as the origin. The curve equations constituting the two rear oblique planes (III, IV) conform to:

[0011]

[0012] In one embodiment of the present invention, the bionic fish scale monomer structures on the blade surface are arranged according to a certain rule: in the same column, the bionic fish scale monomer structures are arranged in a linear array along the span direction of the blade, the distance between the diamond centers O on the lower surfaces of two adjacent fish scale monomer structures is a1, and the first row of fish scales near the leading edge of the blade is marked as the first column.

[0013] In one embodiment of the present invention, the arrangement rule of the fish scale monomer structure in the downstream direction is: between adjacent odd-numbered rows, the rear end point P of the front row fish scale monomer structure is bThe front end point P of the rear fish scale monomer structure f Between adjacent even-numbered rows, the rear end point P of the front row fish scale monomer structure b The front end point P of the rear fish scale monomer structure f Between the adjacent odd-numbered columns and even-numbered columns, the rear end point P of the odd-numbered column fish scale monomer structure b The upper end point P of the adjacent even-numbered fish scale monomer structure u Or the lower end point P d coincide.

[0014] In one embodiment of the present invention, the bionic fish scale monomers are closely arranged in a diamond shape in the bionic fish scale region (e).

[0015] In one embodiment of the present invention, the length of the bionic fish scale region (e) accounts for 70%-90% of the total length of the blade along the stream direction.

[0016] The beneficial effects of the blades of the embodiments of the present invention are as follows: based on the flow control of the bionic structure in the bionic fish scale area, the fluid flow characteristics on the blade surface are improved, the generation and development of vortices are reduced, the flow resistance is effectively reduced, and the noise generated during the operation of the hydraulic machinery is reduced.

[0017] 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

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 Schematic diagram of a blade of an embodiment of the present invention, wherein (a) is the leading edge of the blade, (b) is the trailing edge of the blade, (c) is the suction surface of the blade, (d) is the pressure surface of the blade, (e) is the bionic fish scale area, and (f) is the diamond-shaped fish scale bionic monomer structure.

[0020] Figure 2 Schematic diagram of the structure definition of a bionic fish scale monomer according to an embodiment of the present invention. Among them, (I, II) are two front curved surfaces, (III, IV) are two rear oblique planes, and (V) is the bottom surface. f It is the front end of the bionic fish scale monomer structure. b It is the rear end point of the bionic fish scale monomer structure. u It is the upper end point of the bionic fish scale monomer structure, P d It is the lower end point of the bionic fish scale monomer structure, P is the vertex of the bionic fish scale monomer structure, and O is the intersection of the diamond diagonal lines on the lower surface of the bionic fish scale monomer structure. DETAILED DESCRIPTION

[0021] 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.

[0022] like Figure 1 As shown, a flow control method based on a diamond fish scale bionic structure and an impeller blade having the same according to an embodiment of the present invention specifically include: the bionic impeller blade is composed of a blade leading edge (a), a blade trailing edge (b) and a blade body. The blade body is characterized in that the blade suction surface (c) and the blade pressure surface (d) on both sides of the blade body include a bionic fish scale area (e), and a diamond fish scale bionic monomer structure (f) arranged in a certain pattern is arranged in the bionic fish scale area.

[0023] In one embodiment of the present invention, the number of the bionic blades is 5 to 8, the thickness of the trailing edge of the bionic blade is δ=1.5 to 3 mm, and the width of the trailing edge of the blade is b=10 to 15 mm.

[0024] In one embodiment of the present invention, the fish scale monomer structure comprises two symmetrically arranged front curved surfaces (I, II), two symmetrically arranged rear inclined planes (III, IV) and a lower surface (V). The intersection of the two front curved surfaces and the lower surface is defined as the front end point P of the bionic fish scale monomer structure. f The front end position is set to face the incoming flow direction, and the intersection of the two rear oblique planes and the lower surface is the rear end point P of the bionic fish scale monomer structure. b The rear end point is set to face away from the incoming flow direction, and the two symmetrical intersections of the front curved surface, the rear inclined plane and the lower surface are respectively recorded as the upper end points P u With the lower end point P d The intersection point of the two front curved surfaces and the top of the two rear inclined planes is recorded as vertex P.

[0025] In one embodiment of the present invention, the two front curved surfaces (Ⅰ, Ⅱ) are curved triangles, the two rear oblique planes (Ⅲ, Ⅳ) are triangles, and the lower surface (V) is rhombus-shaped, with a side length of a1. The fish scale monomer structure is projected into a rhombus on the bottom surface where the lower surface is located, and the position of the vertex P on the projection point of the bottom surface where the lower surface is located is at 70%-80% of the long diagonal line of the rhombus, and the vertical distance from the vertex P to the lower surface is 0.3a1-0.4a1.

[0026] In one embodiment of the present invention, the projections of the two front curved surfaces (I, II) of the fish scale monomer on the bottom surface where the lower surface is located are straight lines P f P u , straight line P f Pd , the intersection line of the front surface is arc PP f , in the shape of an arc. A spatial coordinate system is established with the intersection point O of the rhombus diagonal lines on the lower surface of the fish scale monomer structure as the origin. The curve equations constituting the two front side curved surfaces (Ⅰ, Ⅱ) conform to:

[0027]

[0028]

[0029] In one embodiment of the present invention, the projections of the two rear oblique planes (III, IV) of the fish scale monomer on the bottom surface of the lower surface are respectively straight lines P b P u , straight line P b P d , the intersection line of the rear oblique plane is the straight line PP b The spatial coordinate system is established with the intersection point O of the diamond diagonal lines on the lower surface of the fish scale monomer structure as the origin. The curve equations constituting the two rear oblique planes (III, IV) conform to:

[0030]

[0031] In one embodiment of the present invention, the bionic fish scale monomer structures on the blade surface are arranged according to a certain rule: in the same column, the bionic fish scale monomer structures are arranged in a linear array along the span direction of the blade, the distance between the diamond centers O on the lower surfaces of two adjacent fish scale monomer structures is a1, and the first row of fish scales near the leading edge of the blade is marked as the first column.

[0032] In one embodiment of the present invention, the arrangement rule of the fish scale monomer structure in the downstream direction is: between adjacent odd-numbered rows, the rear end point P of the front row fish scale monomer structure is b The front end point P of the rear fish scale monomer structure f Between adjacent even-numbered rows, the rear end point P of the front row fish scale monomer structure b The front end point P of the rear fish scale monomer structure f Between the adjacent odd-numbered columns and even-numbered columns, the rear end point P of the odd-numbered column fish scale monomer structure b The upper end point P of the adjacent even-numbered fish scale monomer structure u Or the lower end point P d coincide.

[0033] In one embodiment of the present invention, the bionic fish scale monomers are closely arranged in a diamond shape in the bionic fish scale region (e).

[0034] In one embodiment of the present invention, the length of the bionic fish scale region (e) accounts for 70%-90% of the total length of the blade along the stream direction.

[0035] The beneficial effects of the embodiments of the invention are as follows: based on the flow control of the bionic structure in the bionic fish scale area, the fluid flow characteristics on the blade surface are improved, the generation and development of vortices are reduced, the flow resistance is effectively reduced, and the noise generated during the operation of the hydraulic machinery is reduced.

[0036] 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 on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and intent of the present invention.

Claims

1. A flow control method based on a diamond-shaped fish scale bionic structure and an impeller blade having the same, characterized in that: The blade consists of a blade leading edge (a), a blade trailing edge (b) and a blade body, wherein the blade suction surface (c) and the blade pressure surface (d) on both sides of the blade body include bionic fish scale areas (e), and diamond-shaped fish scale bionic monomer structures (f) arranged in a certain pattern are arranged in the bionic fish scale areas.

2. A flow control method based on a diamond-shaped fish scale bionic structure and an impeller having the same according to claim 1, characterized in that: The number of the bionic blades is 5 to 8, the thickness of the trailing edge of the bionic blade is δ=1.5 to 3 mm, and the width of the trailing edge of the blade is b=10 to 15 mm.

3. A flow control method based on a diamond-shaped fish scale bionic structure and an impeller having the same according to claim 1, characterized in that: The fish scale monomer structure comprises two symmetrically arranged front curved surfaces (Ⅰ, Ⅱ), two symmetrically arranged rear inclined planes (Ⅲ, Ⅳ) and a lower surface (V); the intersection of the two front curved surfaces and the lower surface is defined as the front end point P of the bionic fish scale monomer structure f The front end position is set to face the incoming flow direction, and the intersection of the two rear oblique planes and the lower surface is the rear end point P of the bionic fish scale monomer structure. b The rear end point is set to face away from the incoming flow direction, and the two symmetrical intersections of the front curved surface, the rear inclined plane and the lower surface are respectively recorded as the upper end points P u With the lower end point P d The intersection point of the two front curved surfaces and the top of the two rear inclined planes is recorded as vertex P.

4. A flow control method based on a diamond-shaped fish scale bionic structure and an impeller having the same according to claim 3, characterized in that: The two front curved surfaces (Ⅰ, Ⅱ) of the rhombus-shaped fish scale bionic monomer structure are curved triangles, the two rear oblique planes (Ⅲ, Ⅳ) are triangles, the lower surface (V) is rhombus-shaped, and the side length of the rhombus is a1. The projection of the fish scale monomer structure on the bottom surface where the lower surface is located is a rhombus, the position of the vertex P at the projection point of the bottom surface where the lower surface is located is at 70%-80% of the long diagonal line of the rhombus, and the vertical distance from the vertex P to the lower surface is 0.3a1-0.4a1.

5. A flow control method based on a diamond-shaped fish scale bionic structure and an impeller having the same according to claim 4, characterized in that: The diamond-shaped fish scale bionic monomer structure, the projections of the two front curved surfaces (Ⅰ, Ⅱ) of the fish scale monomer on the bottom surface where the lower surface is located are straight lines P f P u , straight line P f P d , the intersection line of the front surface is arc PP f , in the shape of an arc. A spatial coordinate system is established with the intersection point O of the rhombus diagonal lines on the lower surface of the fish scale monomer structure as the origin. The curve equations constituting the two front side curved surfaces (Ⅰ, Ⅱ) conform to:

6. A flow control method based on a diamond-shaped fish scale bionic structure and an impeller having the same according to claim 4, characterized in that: The diamond-shaped fish scale bionic monomer structure, the projections of the two rear oblique planes (III, IV) of the fish scale monomer on the bottom surface where the lower surface is located are straight lines P b P u , straight line P b P d , the intersection line of the rear oblique plane is the straight line PP b The spatial coordinate system is established with the intersection point O of the diamond diagonal lines on the lower surface of the fish scale monomer structure as the origin. The curve equations constituting the two rear oblique planes (III, IV) conform to:

7. A flow control method based on a diamond fish scale bionic structure and an impeller blade having the same according to claim 1, characterized in that: The bionic fish scale monomer structures on the blade surface are arranged according to certain rules: in the same row, the bionic fish scale monomer structures are arranged in a linear array along the blade span direction, the distance between the diamond centers O on the lower surfaces of two adjacent fish scale monomer structures is a1, and the first row of fish scales near the leading edge of the blade is marked as the first row.

8. The flow control method based on the diamond fish scale bionic structure and the impeller blade having the same according to claim 3, characterized in that: The arrangement rule of the fish scale monomer structure in the downstream direction is: between adjacent odd-numbered rows, the rear end point P of the front row fish scale monomer structure b The front end point P of the rear fish scale monomer structure f Between adjacent even-numbered rows, the rear end point P of the front row fish scale monomer structure b The front end point P of the rear fish scale monomer structure f Between the adjacent odd-numbered columns and even-numbered columns, the rear end point P of the odd-numbered column fish scale monomer structure b The upper end point P of the adjacent even-numbered fish scale monomer structure u Or the lower end point P d coincide.

9. A flow control method based on a diamond-shaped fish scale bionic structure and an impeller blade having the same according to claim 7 or 8, characterized in that: The bionic fish scale monomers are closely arranged in a diamond shape in the bionic fish scale area (e).

10. A flow control method based on a diamond-shaped fish scale bionic structure and an impeller blade having the same according to claims 1, 3, 4, 5, 6, 7, 8, and 9, characterized in that: The length of the bionic fish scale area (e) accounts for 70%-90% of the total length of the blade along the stream direction.

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