Effect of the Diameter of Pressure-Balance Pipe on Axial Hydraulic Thrust

Journal of Marine Science and Engineering

Yue Lv¹  Zhengwei Wang²  Fei Zhang³  Zhonghua Gui³ 

[1] College of Water Resources and Civil Engineering, China Agricultural University Beijing, Beijing 100083, China;Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China;Pumped-Storage Technological & Economic Research Institute, State Grid Xin Yuan Company Ltd., Beijing 100761, China;

关键词: pump turbine;    pressure-balance pipe;    axial hydraulic thrust;    seal clearance flow;   

DOI  :  10.3390/jmse9070724

来源: DOAJ

【 摘 要 】

The axial hydraulic thrust has great influence on the safety and stability of a pump turbine. A common way to balance hydraulic thrust is to install a pressure-balance pipe, and the change in pipe diameter is one of the important factors affecting axial hydraulic thrust. In this paper, the influence of the diameter changes in a pressure-balance pipe on axial hydraulic thrust of a pump turbine, plus the seal clearance flow, is studied and analyzed under three work conditions, i.e., 100%, 75%, and 50% loads. It is found that under 100% and 75% load conditions, the axial hydraulic thrust increases vertically with the increase in pipe diameter; whereas, under 50% load condition, the axial hydraulic thrust increases first and then decreases with the increase in pipe diameter. The results aim to give guidelines for the choice of pressure-balance pipe diameters and to control the axial hydraulic thrust of a pumped-storage power station, so that the hydraulic excitation force can be better matched with the hydraulic mechanism.

【 授权许可】

Unknown