中文摘要：

为研究螺旋轴流泵内部流场及其压力脉动特性，应用ICEM对其过流部件进行网格划分，采用CFX软件对其进行定常和非定常数值模拟，得到泵内部流场和各监测点的压力脉动。结果表明：0．8Q工况时，在叶轮轮毂与叶片结合处存在局部高压区和漩涡，随着流量的增大，局部高压区和漩涡逐渐减小并消失；设计工况和1．2Q工况时，泵内部压力和速度分布逐渐均匀，流动平稳，人流平顺。导叶进出口的压力系数波动幅值明显大于叶轮进出口边，具有明显的波峰与波谷，压力脉动主要产生在低频区，并呈现周期性降低的趋势，且其幅值均在固有频率的整数倍处产生。各监测点中，进口边压力脉动幅值最大，且轮缘侧大于轮毂侧，出口边监测点压力波动较为均匀，振幅不大。泵运行全过程中，获得了平滑下降的流量扬程曲线和功率曲线，无马鞍区、无过载现象发生，满足设计要求，预测曲线与试验曲线基本吻合，表明数值模拟较为准确，对螺旋轴流泵的设计具有一定的指导意义。

英文摘要：

For the study of screw pump internal flow and pressure pulsation characteristics, ICEM - CFD was applied to structure mesh generation for flow components, and the steady and unsteady simulations were carried out by CFX software to get the pump internal flow and the pressure pulsations of the monitoring points. The results are as follows ： under 0. 8Q condition, there is local high-pressure area and whirlpools existing at the junction of the hub and the blade, which gradually decrease and eventually disappear as the flow rate increasing; under the design condition and 1.2Q condition, the internal pressure and velocity distributions gradually become uniform, the flow is stable and the inflow is smooth. The pressure coefficient fluctuation amplitudes of the inlet and outlet of guide vane are significantly greater than that of the impeller and have obvious peaks and troughs; the pressure pulsation mainly generates in the low frequency region, reduces with a cyclical trend, and its amplitudes are generated at the frequencies that are the whole-number multiple of the natural frequency. Among the monitoring points, the pressure pulsation amplitude of the inlet is the largest, and the amplitude of blade rim side is larger than that of the hub side. Pressure fluctuation amplitudes of monitoring points at the outlet are uniform and small. In the whole process of pump operation, the smooth downward flow head curve and power curve are obtained, and there is no saddle area and overload phenomenon occurred. These meet the design requirements. Prediction curves are basically consistent with the experimental curves. It indicates that the numerical simulation is accurate and has certain value for spiral axial flow pump design.