中文摘要：

采用SST k-ω湍流模型对导叶式单级离心泵内部流场与压力场进行非稳态数值模拟,并进行试验验证。根据数值计算结果分析导叶、蜗壳内非定常压力回收与总压损失、压力脉动等特性。结果表明,数值模拟性能预测结果与试验结果较吻合;由于动静干涉作用影响,导叶与蜗壳内总压损失、静压回收呈现周期性波动,且导叶内总压损失与静压回收都大于蜗壳;导叶内大量漩涡主要由导叶叶片前缘漩涡诱导产生,且逐渐向出口延伸,而蜗壳内漩涡主要由导叶叶片尾缘诱导产生。叶轮中最大压力脉动强度集中于叶轮出口处,导叶与蜗壳中压力脉动强度最大区域分别集中于导叶前缘附近、蜗壳出口。

英文摘要：

The unsteady numerical method was applied to simulate the flow field and pressure field in the single-stage centrifugal pump with vane diffuser by using SST k-ω turbulent model. The static pressure recovery,energy loss and pressure fluctuation in the diffuser and volute were analyzed and the results showed that the performance using the numerical method was in good agreement with data obtained from experimental investigation. The total pressure loss and static pressure recovery in the diffuser and volute presented periodic fluctuation due to interaction between impeller and diffuser,and they were much bigger than those in volute. The pressure loss in vane diffuser was increased as the increase of flow rate.The static pressure recovery was got small as the flow rate came large. Pressure loss and pressure recovery in volute presented the same trend. The difference between the maximum and minimum pressure losses was increased as the increase of operating flow rate,as well as the pressure recovery. The pressure pulsation intensity distributed on impeller was got stronge as the increase of operating flow rate. The pressure pulsation intensity distributed on guide blade was increased at low flow rate and reached the maximum value,and then it was decreased as the increase of flow rate. The large number of vorticity in the diffuser moved to exit was induced by the vane leading edge,but it was provoked by the vane trialing in volute. The maximum pressure fluctuation intensity coefficient（ C_（sdv）） in impeller was concentrated at the impeller exit,and it was concentrated on the vane leading edge and the volute exit in the diffuser and volute,respectively.