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水力机械的叶片流动弹性失稳将严重影响机组的正常运行。为了对叶片的流动弹性稳定性作出较准确的预估，利用激盘模型，将整个流道视为一个无厚度的激盘，对激盘应用流体力学的基本方程，并利用激盘突跃条件，得到作用于叶片的非定常流动力，发展了一种预测水力机械叶片流动弹性稳定性的方法。应用发展的方法对某轴流式水轮机的转轮叶片进行了分析。研究结果指出，叶片在来流速度较低即小流量工况下，叶片的流动弹性稳定性较差，容易发生流动弹性失稳。叶片间相角是影响叶片流动弹性稳定性的一个十分重要的参数，叶片间相角在＋１８０°和－１８０°附近时，叶片的流动弹性稳定性较差，在实际安装及运行中，应尽量避免叶片间相角在＋１８０°和－１８０°附近。
The elastic instability of the flow of hydraulic machinery blades will seriously affect the normal operation of the unit. In order to make a more accurate prediction of the elastic stability of the blade flow, using the disk model, the entire flow channel is considered as a thickness-less plateau. The basic equations of the fluid mechanics are applied to the plateau. , The unsteady flow force acting on the blade is obtained and a method of predicting the elastic stability of the flow of the hydro-mechanical blade is developed. The development of an axial flow turbine rotor blades were analyzed. The results show that the blades have low elastic mobility and poor flow elasticity at low flow rates, ie low flow rates. The phase angle between blades is a very important parameter that affects the elastic stability of the blade. When the phase angle between the blades is around + 180 ° and -180 °, the flow elasticity of the blade is poor. In actual installation and operation, Avoid angle between blades at + 180 ° and -180 °.