水泵水轮机在水轮机工况下导叶水力矩试验研究

为分析水泵水轮机在水轮机工况下导叶水力矩大小及其变化规律,针对国内某抽水蓄能电站的水泵水轮机模型,基于电测应力分析方法,对活动导叶轴进行特殊加工处理,分别进行水轮机工况下同步导叶和非同步导叶的水力矩试验。对试验结果分析得出:在不使用非同步导叶时,随着导叶开度的增大所有被测导叶的导叶水力矩因数变化保持一致,并且水力矩的方向从导叶关闭方向逐渐转向导叶开启方向;设置10~#导叶为非同步导叶后,在非同步导叶开度与同步导叶开度值相差小于16.4%时,被测导叶的水力矩因数趋于均匀分布,差值大于16.4%时随着开度值的增大水力矩急剧增大,并且不同导叶的水力矩因数差别较大。

Experimental research on guide hydro-dynamic torque of a pump turbine in turbine mode

To obtain the hydro-dynamic torque magnitude and its variation law of the pump turbine under the turbine mode, the electromotive stress analysis method and the specially processed shaft of guide vane were applied in a pump turbine model of the domestic pump storage plant. The hydro-dynamic torque of each guide vane was investigated under the situation of synchronous guide vane and misaligned configuration respectively. The main conclusions are as follows:once the synchronized guide vane is employed,with the opening increasing, the hydro-dynamic torque factors magnitude of the guide vane has the consistency among all tested vanes, and the direction of the torque shift gradually from the turn-off direction to the turn-on direction. When the 10^# guide vane is set as the misaligned guide vane, and the difference between misaligned guide vane opening and the synchronous one is less than 16.4%, the hydro-dynamic torque factors of the tested guide vanes tend to be distributed regularly. However,when the opening difference is bigger than 16.4%, the hydro-dynamic torque increases sharply with the use of the misaligned guide vane,and the hydro-dynamic torque factors of the different guide vanes change significant.