流量对离心叶轮进口及蜗壳空化影响的成因分析

Cause Analysis of Influence of Flow Rate on Cavitation in Centrifugal Impeller Inlet and Volute

为揭示流量与离心叶轮进口及蜗壳内空化的关系,以相关流动理论为依据,通过分析不同流量条件下叶片入口流动特征,论述了大流量对空化初生及发展的诱导作用;采用数值模拟获得了同一叶轮在不同流量下的流场分布,从压力云图和空泡云图看出流场分布特征与理论分析一致,证明了大流量条件下叶轮进口及蜗壳喉部空化更易发生。研究成果有助于深入认识叶轮内的空化特征及其理论基础。

In order to reveal the relationship between flow rate and cavitation at centrifugal impeller inlet and volute,the flow characteristics of the impeller under different flow conditions were analyzed based on the relevant flow theory.The induction effect of large flow on the initiation and development of cavitation was discussed.The flow field distribution of the same impeller at different flow rates was obtained by numerical simulation.It can be seen that the flow field characteristics are consistent with the theoretical analysis from the pressure cloud diagram and cavitation cloud diagram,which proves that the cavitation in the volute throat and impeller inlet is more likely to be occurred.The theoretical analysis of this article will help to deeply understand the cavitation characteristics in the impeller and its theoretical basis.