Bionic blade on basis of shark surface drag reduction technologies

Abstract

The invention belongs to the technical field of water pumps, and particularly discloses a bionic blade on the basis of shark surface drag reduction technologies. The bionic blade comprises a front edge drag reduction section, a middle arc front drag reduction section, a middle arc rear drag reduction section and a rear edge drag reduction section. The bionic blade is characterized in that the bionic blade is an axial-flow type blade; the front edge drag reduction section is a circular toothed drag reduction groove, the groove width b<1> ranges from 7.5 k<1> to 11.5 k<1>, the groove depth h<1>ranges from 0.35 b<1> to 0.45 b<1>, and the groove shoulder width t<1> ranges from 0.1 b to 0.2 b; the middle arc front drag reduction section is a circular toothed drag reduction groove, the groove width b<2> ranges from 11.5 k<2> to 14.5 k<2>, the groove depth h<2> ranges from 0.65 b<2> to 0.75 b<2>, and the groove shoulder width t<2> ranges from 0.1 b<2> to 0.2 b<2>; the middle arc rear drag reduction section is a knife-edge-shaped drag reduction groove, the groove width b<3> ranges from 16.5 k<2> to 18.5 k<3>, the groove depth h<3> ranges from 0.45 b<3> to 0.55 b<3>, and the groove shoulder width t<3> ranges from 0.1 b<3> to 0.2 b<3>; the rear edge drag reduction section is a sawtooth drag reduction groove, the groove shoulder inclination beta ranges from 50 degrees to 65 degrees, thegroove width b<4> ranges from 13.5 k<4> to 15.5 k<4>, the groove depth h<4> ranges from 0.95 b<4> to 1.05 b<4>, and the groove shoulder width t<4> ranges from 0.1 b<4> to 0.2 b<4>. The bionic blade has the advantages that the drag reduction efficiency of different drag reduction grooves can be effectively utilized, accordingly, surface drag of the bionic blade and hydraulic loss due to the surfacedrag of the bionic blade can be reduced to the greatest extent, and the operational efficiency of pumps can be improved.

Description

technical field [0001] The invention belongs to the technical field of water pumps, in particular to a bionic blade based on shark surface drag reduction technology. Background technique [0002] With the gradual development of water pump technology and bionic technology, multidisciplinary interdisciplinary design has gradually occupied an important position in the field of water pump design. As a relatively mature technology, bionic technology has shown better functions in reducing drag and noise. Many scholars at home and abroad have also conducted research on the application of bionic technology on vane pumps, which also proves that bionic technology has certain efficacy and feasibility in terms of drag reduction on vane pumps. [0003] At present, the application of bionics in blade design is mostly a low-noise axial flow fan composite bionic airfoil blade [application number: 201710455803.X; publication number: CN107023515A] and a horizontal axis tidal current energy tu...

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Problems solved by technology

[0003] At present, the application of bionics in blade design is mostly a low-noise axial flow fan composite bionic airfoil blade [application number: 201710455803.X; publication number: CN107023515A] and a horizontal axis tidal current energy turbine combination as recorded in Chinese patent documents. The design method of the airfoil blade [Application No.: CN105201728A; Publication No.: CN105201728A], the above-mentioned designs are bionic design of the airfoil shape of the blade, ignoring the influence of the airfoil surface boundary layer on the flow around

[0004] On this basis, a bionic non-smooth surface centrifugal fan blade [application number: 201520028311.9 publication number: CN204553332U] recorded in Chinese patent literature uses bionic non-smooth technology to change the flow field near the wall, in order to reduce the fan blade to a certain extent. The thickness of the surface boundary layer reduces the friction of the blade surface on the incoming flow, but the above design uses coarse particles to distribute the surface, and the interval distribution of the particles forms a narrow channel, which has a negative impact on the flow field of the incoming flow on the blade surface. The drag reduction effect of the bionic surface is greatly reduced, and it is only used in the field of fans

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