Mechanism And Application Of Efficiency Enhancement On Morphology/materials Bionic Coupling Functional Surface

The pump is one of the most widely used general machinery to the human. It isclosely bounded up with human industrial and agricultural production, but it still hassome problems, such as low efficiency, large power consumption. The traditionalmethods of improving the efficiency of water pump are pumping level transformation,modification or replacement of the impeller, riblet method of imitation shark skinepidermis, impeller passage with ceramics and other methods, the surface of theimpeller of hydrophobic coating method and so on, but each of them has its ownlimitations.Using the surface membrane materials elastic deformation, using surfacemembrane material and on the surface of the base material of bionic non-smoothstructure dynamics the coupling actively control of the fluid medium, to reduce dragfunction; and the pump that is a typical fluid medium of the work of the mechanicalcomponents is taken as the carrier, with synergistic, drag reduction as the researchobject, using experimental design optimization of Binary of dynamic coupling bionicfunctional surface structure parameters; explores the dynamic coupling bionic functionsurface drag reduction mechanism by fluid-solid coupling technique, in order to obtainthe “low consumption, high efficiency” coupling bionic functional surface design andmanufacture system lays a foundation for the realization of this theory, to provide newmethods for machinery components in more general condition of drag reduction,synergism problem. Therefore, this article were mainly studied from the followingaspects and obtained the corresponding conclusions:First, perfected the design and manufacturing process of coupling bionicfunctional surface. The use of intermediate medium by using a casting molding method,completed the processing technology research of Shape factors in the substratematerial which is complicated by flow channel on the surface of the pump impeller,realized the processing of the basal material of bionic non-smooth structure. A castingmolding method is especially suitable for the complex and irregular surface machiningnon-smooth surface. Using spin coating process, the polyurethane material was coated on the substratematerial with non-smooth structures, forming morphology/material coupling bionicfunctional surface with certain elasticity.Second, morphological/material two element coupling bionic functional surfacefluid solid coupling simulation and mechanism analysis. Using water as the carrier, inorder to improve the pump efficiency as the goal, to design the shape of two Binary ofmorphological/material dynamic coupling bionic functional surface were optimized bydesigning experiments. Experiments show that, the dynamic coupling bionic functionalsurface in water pump impeller arrangement significantly influenced and improved thepump efficiency; the efficiency curves of plump was smoothed, that is to say, even ifthe bionic coupling pump running deviation from the point of maximum efficiency, itstill can be in the high efficiency range operation; optimized bionic coupling pumpefficiency can reach5%and above, compared with the single factor of bionicnon-smooth water pump, bionic coupling pump can enhance the efficiencyperformance and save energy more significantly and stable in the whole flow period.Third, morphological/material two elements coupling bionic functional surfacedrag reduction mechanism research.From the aspect of fluid-solid coupling numerical simulation, coupling bionicfunctional surface fluid medium action mechanism was studied. The energy savingmechanism for: fluid at low flow rates, due to the existence of polyurethane elasticcoatings, in the negative pressure generated elastic deformation, absorb a portion ofenergy, and release this energy in the negative pressure peak, which is called therelease effect can effectively reduce the energy loss, thereby improving the waterpump efficiency; in the higher flow velocity, the larger flow volume conditions, waterflow strongly impact coupled blades, deformed coupling pump impeller surface is in afully coupled state, the blade surface ceased to be smooth structure and absorbing aportion of the flow passage of impeller internal turbulent energy, inhibited thehorizontal and vertical turbulent burst, stabilized turbulence and delayed transition,which raised the production efficiency.