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混流式水轮机尾水管中由涡带引起的压力脉动，对水轮机的稳定运行有很大影响，研究尾水管中的压力脉动规律，对指导水轮机的运行是有重要意义的。一般认为，混流式水轮机尾水管中由涡带引起的压力脉动，与尾水管进口处的水流环量有关，本文阐述了一种在已知模型综合特性曲线的条件下，利用数据拟合的方法来近似地计算混流式水轮机尾水管中压力脉动特性的方法。
The pressure pulsation caused by vortex belt in the draft tube of Francis turbine has a great influence on the stable operation of the turbine. Studying the law of pressure pulsation in the draft tube is of great significance to guide the operation of the turbine. It is generally believed that the pressure pulsation caused by the vortex band in the draft tube of the Francis turbine is related to the flow volume of the water at the inlet of the draft tube. In this paper, a method of data fitting based on the known characteristic curve of the model is described. To approximate the method to calculate the pressure fluctuation in the draft tube of Francis turbine.