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水轮发电机组部分负荷时，尾水管压力脉动是反映水轮机水力稳定性的重要指标．这种压力脉动的允许值方案，也说明了用△H／H判断原型水轮机的振动稳定性的局限性和不确定性，还提出了在进行模型水轮机验收试验及利用本方案进行稳定性评价时需注意的问题．
When the turbine generator is under partial load, the draft pressure of the draft tube is an important index reflecting the hydraulic stability of the turbine. This pressure pulsation allowable value scheme also illustrates the limitations and uncertainties of using △ H / H to determine the vibration stability of the prototype turbine. It is also proposed that when the model turbine acceptance test is carried out and the stability of the prototype turbine is evaluated Need to pay attention to the problem.