Experimental study of the flow field of a high head model pump turbine based on PIV technique  

作　　者：De-min Liu Wei-lin Xu Yong-zhi Zhao 

机构地区：[1]State Key Laboratory of Hydraulics and Mountain River Engineering,Sichuan University,Chengdu 610065,China [2]Dongfang Electric Machinery Co.,Ltd,Deyang 618000,China

出　　处：《Journal of Hydrodynamics》2021年第5期1045-1055,共11页水动力学研究与进展B辑（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.51279172);supported by the China Postdoctoral Science Foundation(Grant No.2020M673568XB),the Deyang Science and Technology Support Program(Grant No.2018CKJ002).

摘　　要：Pumped storage units are the main parts in China’s power construction,as a hot issue concerned by the industry.The pump turbine involves the two-way flows and a multiple condition operation,and its operation flow pattern is very complex.The particle image velocimetry(PIV)is a very effective test technique to determine the internal flow field of pump turbines.This paper discusses the key problems of the pump turbine,based on the PIV experiments under typical conditions of the pump turbine,especially for problems such as the S-shape problem,the hump problem,the pressure fluctuation problem and the cavitation problem.In the internal flow fields under typical conditions are determined.The vortices induced and their development are observed in the PTV test.The flow phenomenon is shown at each operating point.The typical problems of the pump turbine are closely related to the vortex distribution in the internal flow field.From the PIV test results under several working conditions and from the comparisons between the optimal condition and the part load condition,it is seen that the vortex distributions are very different.Vortices at the vane-less area between the guide vane and the runner are closely related to the strong pressure pulsation,the first hump and the S-shape curve.From the PIV results of the cavitation working points,it is seen that the flow angle is changed in the vane-less region and the runner leading edge because of the cavitation bubbles and that the flow angle deviates from the optimal setting angle.From the computational fluid dynamics(CFD)result of the second hump working points,it is concluded that the vortex shedding on the runner leading edge is the main cause of the second hump.

关 键 词：Pump turbine particle image velocimetry(PIV) pressure pulsation pump hump CAVITATION four quadrants curve 

分 类 号：TK73[交通运输工程—轮机工程]