中文摘要：

为研究不同空化发展阶段离心泵泵腔内的流动情况及其对叶轮的影响，提出了一种泵腔区域的拓扑块生成和结构化网格划分方法。在充分考虑近壁区网格质量的基础上，采用SST k-ω湍流模型和Rayleigh-Plesset空化模型对设计工况下某离心泵进行了全流场空化数值模拟，并计算了3种有效汽蚀余量下泵腔内的非定常流动情况及其对叶轮的作用力。结果表明：空化造成泵腔内压力脉动的幅值增大，由于前口环的存在，其前泵腔内的压力脉动幅值大于后泵腔；空化的加剧造成泵腔内宽频脉动的增加，以轴频最为明显；空化的加剧不仅影响泵腔内的流态，同时也增大了设计工况下作用于叶轮上的径向力和轴向力。

英文摘要：

In order to study the cavitating flow at different stages of cavitation in the pump casing of a centrifugal pump, the topology blocking and structured mesh generation strategies was proposed on the domain of the pump. Taking full account of the near wall region mesh quality, steady and unsteady cavitation simulation of the centrifugal pump has been proceed using the SST k-ω turbulence model combining with Rayleigh-Plesset cavitation model. Unsteady flow of the pump chamber and the force endured by the impeller were obtained under three NPSHa. The results show that cavitation increases the amplitude of pressure pulsation in pump casing sharply. Due to the presence of the wear rings, amplitude of pressure pulsation at front side chamber is greater than back side chamber. Broadband pulsation frequency increase with the cavitation intensifies, especially at axis frequency. Intensification cavitation not only affects the flow pattern of the pump chamber, but also increases the radial and axial forces acting on the impeller.