离心泵叶片工作面脊状结构对空化抑制研究OA

In order to improve the cavitation performance of centrifugal pumps,an impeller model with ridged structure arranged at the leading edge of centrifugal pump blades was proposed.Hydraulic performance experiments and cavitation performance experiments of the original model were carried out,and the transient cavitation of the original model and the ridge-structured model was numerically simulated.The external characteristic curve and cavitation performance curve,as well as the changes in the volume of cavitation,flow field structure,absolute pressure distribution,vorticity field and turbulent kinetic energy in the impeller channel were compared and analyzed.The results show that the ridge-structured model has little influence on the external characteristics of the original model,and the numerical simulation results are in good agreement with the experimental data.The volume of vacuoles is significantly lower than that of the original model.The ridge-structured model effectively optimizes the flow field structure,reduces part of the backflow and lateral jet,and increases the local pressure at the leading edge of the impeller inlet,thereby inhibiting the occurrence of cavitation.The ridged structure reduces the generation of vortices inside the impeller,makes the flow more stable,reduces the turbulence intensity in the impeller,reduces the energy dissipation,and improves the cavitation performance of the centrifugal pump.