A Study of Full-Load Draft Tube Surge in Hydraulic Power Turbine

采用小比例尺模型对水轮机尾水管浪涌进行了实验和数值研究。研究结果表明，从低流量到过载工况，尾水管喘振发生的工况范围很广。脉动的频率与涡绳进动的频率不同。此外，通过施加流量波动的方法，对尾水管内空化的动态特性进行了实验研究。

Experimental and numerical investigations of a surge in a hydraulic turbine draft tube were carried out using a subscale model. It has been confirmed that the draft tube surge occurs at wide range of the operation condition from the low flow rate through the over load conditions. The frequencies of the surge are different from those of the vortex rope precession. Additionally, dynamic characteristics of the cavitation in the draft tube were examined experimentally by imposing flow rate fluctuations.