中文摘要：

基于大涡模拟法,对旋流自吸泵内部流场进行了三维非定常数值模拟,通过设置监测点,得到了蜗壳壁面、导壁和气液分离室内的水压力脉动情况,并进行了频域分析。通过与实测扬程和功率对比,证明大涡模拟法能较准确地反映泵的流动特征。研究表明,蜗壳内压力脉动最大幅值出现在隔舌区偏向叶轮旋转方向处,导壁内流道中在流道扩散区域内压力脉动幅值也较大,说明在这两个区域的压力脉动影响泵的性能,是造成泵振动、噪声,影响泵稳定运行的重要因素。在泵体水力设计时,要对其可能产生的压力脉动加以考虑。

英文摘要：

Based on large eddy model simulation, 3--D unsteady flow field of rotational flow self --priming pump was simulated numerically. The water pressure fluctuations of volute wall, guide wall and separation chamber were obtained by setting monitoring points, and frequency domain analysis was achieved. By comparing the predicted and measured heads and powers, it is proved that the large eddy model simulation can accurately reflect the flow characteristics. The results show that the most pressure fluctuation amplitude in the volute is lean to the impeller rotation direction on the cutwater region, and the pressure fluctuation amplitude inside the diffused region of the guide wall is also great. The pressure fluctuations of the two regions can influence the pump performance, and is important factors that may lead to vibration, noise even impact on pump＇s stable operation. The pressure fluctuation of the pump body must be considered in designing its structure.