运行工况对水泵水轮机尾水管进口压力的影响

Effect on Pressure in Draft Tube of Different Conditions

通过对比分析某电站在不同尾水位运行工况下甩相同负荷时的尾水管进口实测压力,得出随尾水位降低、水头升高以及导叶开度减小,其尾水管进口压力脉动幅值有减小的趋势;同时,针对各不同工况下的尾水管进口压力实测均值与理论计算值进行对比分析,得出甩负荷时机组水头越高,其尾水管进口压力的理论计算值与实测值越接近。上述对比分析工作,为后续的抽水蓄能电站甩负荷试验和安全性预测提供了重要参考。

After load-rejection test in different tail water level conditions of one pump storage power station, the measured inlet pressure values in draft tube were compared and analyzed. It showed that the inlet pressure fluctuation in draft tube tends to decrease while the tail water decreased, the unit head increased and the guide vane opening decreased. At the same time, the mean measured inlet pressure value and calculated inlet pressure value in draft tube were also compared and analyzed. It concluded that the higher the unit head, the closer the mean measured inlet pressure value and calculated inlet pressure value. These conclusion can provide a reference for load rejection test and safety prediction of pumped storage power station.