Flow control method based on insect biological cuticle bionic structure and impeller blade with same

Abstract

The present application relates to a kind of flow control method based on insect biological cuticle biomimetic structure and the impeller blade with it, including blade leading edge (a), blade trailing edge (b), blade top (c), blade root (d), suction surface (e) and pressure surface (f) on both sides of blade main body;The blade trailing edge (b) of the pressure surface (f) is provided with biomimetic pit structure (g), and the biomimetic pit structure (g) is composed of multiple biomimetic pit units and is arranged in linear array along downstream direction.The present application can optimize the flow state of fluid on the surface of blade, reduce vortex shedding, reduce flow resistance, suppress pressure pulsation during the operation of impeller, reduce noise during the operation of fluid machinery.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of fluid machinery, and particularly relates to a flow control method based on a bionic structure of an insect biological cuticle and an impeller blade with the same. BACKGROUND

[0002] In recent years, with the deepening of human exploration of nature, the bionic structure flow control technology has been rapidly developed and widely applied. With the rapid development of bionics and micro-nano technology, people have begun to pay attention to the influence of the microstructure (such as pits, textures, etc.) on the blade surface on the fluid flow characteristics. By arranging reasonable pits on the blade surface, the flow state of the fluid on the blade surface can be significantly improved, and the performance of the fluid machinery can be improved. Therefore, a bionic impeller blade based on the bionic surface structure is needed to improve the fluid flow characteristics of the blade trailing edge, optimize the flow state of the fluid on the blade surface, reduce vortex shedding, reduce flow resistance, and reduce noise during the operation of the fluid machinery. SUMMARY

[0003] The purpose of the present application is to provide a flow control method based on the bionic structure of the biological cuticle of insects and an impeller blade with the same, which realizes flow control based on the arrangement of the bionic surface structure in the trailing edge region of the blade.

[0004] The present application provides an impeller blade based on the bionic structure of the biological cuticle of insects, comprising a blade leading edge, a blade trailing edge, a blade top, a blade root, a suction surface and a pressure surface on both sides of the blade body; the trailing edge of the pressure surface is provided with a bionic pit structure, and the bionic pit structure is composed of a plurality of bionic pit units arranged in a linear array in the flow direction.

[0005] Further, the number of the impeller blades is 3-20, the thickness of the trailing edge of the impeller blade is δ=1-4mm, and the width of the trailing edge of the impeller blade is b0=10-20mm.

[0006] Further, the bionic pit unit is composed of a spindle-shaped curved surface with sharp ends and a wide and bulging middle part, and the endpoints of the sharp ends of the spindle-shaped curved surface are the front and rear side vertices of the bionic pit unit, respectively.

[0007] Further, the bionic pit unit takes O as the origin, and is composed of a first base segment I sinusoidal curve of the outer contour of the projection of the upper surface on the x-y plane a second base segment II sinusoidal curve and a third base segment III circular arc curve of the outer contour of the projection of the side surface on the y-z plane with P1 as the center together.

[0008] Further, the projection of the bionic concave unit on the bottom surface where the pressure surface is located is a curved side quasi-rhombus structure composed of two sinusoidal curves, and the diagonal lengths of the curved side quasi-rhombus structure are a1 and a2 respectively;

[0009] The equations of the two sinusoidal curves of the projected outer contour first base segment I and second base segment II are respectively:

[0010]

[0011] Further, the cross section of the bionic concave unit is in the shape of a circular arc, and the curve equation of the third base segment III on the y-z plane is:

[0012]

[0013] Further, the interval between the front and rear vertices of adjacent bionic concave units in the same column is The interval between the end points of adjacent column concaves is

[0014] By the above scheme, based on the flow control method of the bionic structure of the insect biological cuticle and the impeller blade with the same, the flow control based on the bionic structure coupling element can optimize the flow state of the fluid on the blade surface, reduce vortex shedding, reduce flow resistance, suppress pressure pulsation during the operation of the impeller, and reduce noise during the operation of the fluid machine.

[0015] The above description is only a summary of the technical scheme of the present application. In order to more clearly understand the technical means of the present application, and to implement the content of the description, the following will be described in detail with the preferred embodiments of the present application and with the help of the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the flow control method of the bionic structure of the insect biological cuticle and the impeller blade with the same.

[0017] Figure 2 It is a schematic diagram of the bionic concave unit of the insect cuticle of an embodiment of the present application.

[0018] REFERENCE NUMERALS:

[0019] a-blade leading edge; b-blade trailing edge; c-blade top; d-blade root; e-suction surface; f-pressure surface; g-bionic concave structure. DETAILED DESCRIPTION

[0020] The specific embodiments of the present application will be further described in detail below in combination with the drawings and examples. The following examples are used to illustrate the present application, but not to limit the scope of the present application.

[0021] Reference Figure 1、 Figure 2 The embodiment shown provides a flow control method based on the bionic structure of insect biological epidermis and an impeller blade with the same, which comprises a blade leading edge a, a blade trailing edge b, a blade top c, a blade root d, a suction surface e and a pressure surface f on both sides of the blade main body. A bionic pit structure g arranged in a certain pattern is arranged at the blade trailing edge b of the pressure surface f, and the blade surface bionic pit structure g is composed of a plurality of bionic pit units (surface pits) arranged in a linear array along the flow direction. By referring to the pit shape commonly existing on the above-mentioned biological surface, the bionic biological epidermis pit structure is arranged at the blade trailing edge position along the flow direction, thereby forming a bionic blade trailing edge with the function of improving the fluid flow state.

[0022] The present application can effectively optimize the flow state of fluid on the blade surface, reduce vortex shedding, and has the advantages of reducing internal unstable flow of fluid machinery, inhibiting pressure pulsation, improving shaft vibration displacement, vibration reduction and noise reduction, etc.

[0023] In an embodiment of the present application, the number of prototype impeller blades is 3-20, the thickness of the prototype impeller blade trailing edge is δ=1-4mm, and the width of the prototype impeller blade trailing edge is b0=10-20mm.

[0024] In an embodiment of the present application, the bionic pit unit is composed of a spindle-shaped curved surface with slender ends and a wide and convex middle part, and the endpoints of the slender ends are the front and rear side vertices of the bionic pit unit. The bionic pit unit takes O as the origin, and the first base segment I sinusoidal curve of the outer contour of the upper surface in the x-y plane The second base segment II sinusoidal curve And the third base segment III of the outer contour of the side surface projected on the y-z plane is a circular arc curve with P1 as the center Together constitute.

[0025] In an embodiment of the present application, the bionic pit unit is projected on the bottom surface of the pressure surface f as a curved side rhomboid structure composed of two sinusoidal curves, and the lengths of the diagonals are a1 and a2 respectively. The equations of the first base segment I and the second base segment II sinusoidal curves of the outer contour of the upper surface in the x-y plane are:

[0026]

[0027]

[0028] In an embodiment of the present application, the cross section of the bionic pit unit is in the shape of a circular arc, and the curve equation of the third base segment III in the y-z plane is:

[0029]

[0030] In one embodiment of the present application, the interval between the front and rear side vertices of adjacent pit units in the same column is The interval between the end points of adjacent columns of pits

[0031] The flow control method based on the bionic structure of the insect biological cuticle and the impeller blade with the same can optimize the flow state of the fluid on the blade surface, reduce vortex shedding, reduce flow resistance, suppress pressure pulsation during the operation of the impeller, and reduce noise during the operation of the fluid machine.

[0032] The above only describes the preferred embodiments of the present application and is not used to limit the present application. It should be noted that, for ordinary skilled persons in the art, several improvements and modifications can be made without departing from the technical principles of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.

Claims

1. A biomimetic structure based on the cuticle of insects for impeller blades, characterized in that, The impeller blade comprises a blade leading edge (a), a blade trailing edge (b), a blade top (c), a blade root (d), a suction surface (e) and a pressure surface (f) on both sides of the blade body; the pressure surface (f) is provided with a bionic pit structure (g) at the blade trailing edge (b), and the bionic pit structure (g) is composed of a plurality of bionic pit units arranged in a linear array in a downstream direction; The bionic pit unit is composed of a spindle-shaped curved surface with sharp ends and a wide and bulging middle part, and the endpoints of the sharp ends of the spindle-shaped curved surface are the front and rear side vertices of the bionic pit unit, respectively; The bionic concave unit takes O as the origin, and the first base segment I sinusoidal curve of the outer contour of the projection of the upper surface on the x-y plane The second base segment II sinusoidal curve And the third base segment III of the outer contour of the projection of the side surface on the y-z plane is a circular arc curve with P1 as the center Together constitute; The projection of the bionic pit unit on the bottom surface of the pressure surface (f) is a curved-side rhomboid structure composed of two sinusoidal curves, and the lengths of the diagonal lines of the curved-side rhomboid structure are a1 and a2, respectively; The equations of the two sinusoidal curves of the first base segment I and the second base segment II of the projected outer contour are as follows: The cross section of the bionic pit unit is in the shape of a circular arc, and the curve equation of the third base segment III in the y-z plane is as follows:

2. The impeller blade based on the bionic structure of insect biological cuticle according to claim 1, characterized in that, The number of the impeller blades is 3-20, the thickness of the impeller blade trailing edge is δ=1-4 mm, and the width of the impeller blade trailing edge is b0=10-20 mm.

3. The impeller blade based on the bionic structure of insect biological cuticle according to claim 1, characterized in that, Interval between front and back vertexes of adjacent bio-mimic concave units in the same column Interval between end points of adjacent column concaves a1≤a2.

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