通过CFturbo与UG软件建立及优化模型，基于RNG k-逋牧髂Ｐ秃蚏ayleighPlesset 空化模型，利用CFX（计算流体力学）软件对微型高速离心泵进行数值模拟。通过小流量和不同进口总压工况，对叶轮进口段流动特性、叶片表面和叶轮流道的静压分布以及叶轮流道内空泡数分布3个方面进行流场分析。结果表明：流量对叶轮进口段回流影响较大；叶片前缘到后缘的压力逐渐增大，叶轮流道进口到出口的压力也逐渐增加；扬程系数陡降前的振动是叶轮空化不稳定引起的，随着空化系数的降低，空泡体积数逐渐占据整个叶轮流道，空泡分布也由不对称转变为对称结构；为微型高速泵的设计和研究提供了理论基础。

A micro-highspeed centrifugal pump was numerically simulated based on the RNG k-ɛturbulence model and Rayleigh-Plesset cavitation model by using CFX,CFturbo and UG softwares.The flow characteristics of the inlet section of the impeller,static pressure distribution of the blade surface,impeller flow path,and the distribution of the number of bubbles in the impeller flow path were analyzed for small flow rates and different total inlet pressure conditions. The results showed the flow rate has a significant influence on the impeller inlet flow. The blade pressure gradually increases from the leading edge to the trailing edge,and the passage pressure also increases from impeller inlet to outlet. The vibration before the steep drop of the lift coefficient is due to the instability of the impeller cavitation. With the decrease of the cavitation coefficient,the volume of the vacuoles gradually occupies the entire impeller passage. Vacuolization distribution also changes from asymmetric to a symmetrical structure,which is expected to provide a theoretical basis for the design and research of micro-high-speed pump.

TH311

国家自然科学基金项目(51678508)；四川省科技厅项目（2016JY0187）；四川省教育厅重大培育项目（14CZ0013）；流体及动力机械教育部重点实验室开放基金（szjj2016-003）；西华大学研究生创新基金项目（ycjj2017207）