基于PIMPLE算法的低负荷水泵水轮机内部流态研究  

Research on internal flow pattern of low-load pump-turbine based on PIMPLE algorithm

作　　者：王浩博 周大庆[2] 郭俊勋 WANG Haobo;ZHOU Daqing;GUO Junxun(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China;College of Energy and Electrical Engineering,Hohai University,Nanjing 211100,China)

机构地区：[1]河海大学水利水电学院,江苏南京210098 [2]河海大学能源与电气学院,江苏南京211100

出　　处：《人民长江》2023年第11期152-157,165,共7页Yangtze River

基　　金：国家自然科学基金项目(51979086,51839008)。

摘　　要：为探究水泵水轮机在低负荷工况运行时的异常水力激振现象,基于OpenFOAM软件中的PIMPLE算法,结合SAS-SST湍流模型对水泵水轮机在不同低负荷运行工况的内部流态进行三维数值模拟。与试验数据对比后,证明PIMPLE算法在低负荷工况模拟时具有一定的稳定性和可行性。从模拟结果中可发现:机组在偏离额定工况运行时,无叶区内部易出现低频脉动现象,同时叶片吸力面及出水边均存在回流涡结构。而随着流量增大后,转轮内部流态得以改善,尾水管直锥段处从小开度工况下的偏心螺旋状涡带逐渐向同心圆柱形涡带演变,同时涡带的运动过程一定程度上会影响尾水管进口处流态及压强分布的均匀程度,是诱发尾水旋涡的主要影响因素。In order to explore the abnormal hydraulic excitation phenomenon of the pump-turbine in the low-load operation condition,based on the PIMPLE algorithm in the OpenFOAM software,combined with the SAS-SST turbulence model,a three-dimensional numerical simulation for the pump-turbine in different low-load operation conditions was carried out.After comparing the test data,it is proved that the algorithm has certain stability and feasibility in the simulation of low load conditions.From the simulation results,it can be found that when the unit is operating away from the rated condition,low-frequency pulsation is prone to occur in the vaneless area,and there are backflow vortex structures on the suction surface of the blade and the outlet edge.As the flow rate increases,the internal flow state of the runner is improved,and the eccentric spiral vortex at the straight cone section of the draft tube under the condition of small opening gradually evolves into a concentric cylindrical vortex,and the movement process of the vortex will affect the flow state and the uniformity of pressure distribution at the inlet of the draft tube,which is the main factor inducing the draft tube vortex.

关 键 词：水泵水轮机 OPENFOAM PIMPLE算法 压力脉动 涡带 

分 类 号：TV734.1[水利工程—水利水电工程]