为了研究含沙水流下径向式导叶离心泵内的压力脉动变化规律，采用大涡模拟和Mixture多相流模型相结合的数值模拟方法，并结合SIMPLEC算法，对输送固液两相流介质的径向式导叶离心泵进行了全流道三维非定常数值计算，并在叶轮与导叶交接面及蜗壳出口段处，将固液两相介质与清水介质时的计算结果进行对比分析。数值计算结果表明，离旋转轴越远处压力脉动幅值越小；导叶与蜗壳内叶频是压力脉动主要频率，且在1倍叶频处最大；导叶内压力脉动幅值均大于蜗壳内，且随着颗粒粒径的增大，压力脉动幅值逐渐减小；蜗壳隔舌处的压力脉动幅值大于蜗壳其他部位；在叶轮与导叶交接面处，清水介质时压力脉动幅值大于固液两相介质时，固液两相介质时脉动波形滞后于清水介质时0.003 5 s；蜗壳出口段，固液两相时压力脉动幅值均大于清水时。

In order to study pressure fluctuation features in a centrifugal pump with radial diffuser under solidliquid twophase flow conditions,a series of unsteady,Three-dimensional,sand particleladen water flow in a centrifugal pump with radial diffuser are simulated based on large eddy simulation,mixture multiphase model and SIMPLEC algorithm. Additionally,the simulated results of twophase flow are compared with those of water alone at the interface between the impeller and diffuser and outlet section of volute. The results show that farther away from the rotational axis,the pressure fluctuation is smaller. The blade frequency is the main frequency of pressure fluctuation in diffuser and volute. Furthermore,the maximum pressure fluctuation occurs at the double blade frequency. The pressure fluctuation inside diffuser is larger than that in volute,and it decreases with increase of particle size.The pressure fluctuation at the tongue of volute is greater than that at elsewhere. The pressure fluctuation of water singlephase flow is greater than the solid-liquid two-phase flow at the interface between the impeller and diffuser,and the pulse waveform of the two-phase flow has 0.0035 s lag.The pressure fluctuation at outlet section of volute is greater in solidliquid two-phase flow than that in water single-phase flow.

TH311

国家自然科学基金资助项目（51579125）