降低水轮机尾水管压力脉动措施的模型试验研究

本文介绍了几种布置在尾水管内的导流装置方案和模型试验结果，描述了各种措施对水轮机效率、出力、流量等参数的影响、降低压力脉动幅值的效果和频率特性。

Experimental Study of Measure Decreasing Water Pressure Fluctuation in Hydroturbine Draft Tube on Model Turbine

The vibration of frames and output power caused by water flow often affects the operating of Francis turbine at part load because of the pressure fluctuation in draft tube. The vibration and noise at full load or over full load are increased. These not only cause the difficulty for the operation of generating unit, but also threaten the safe of the generating unit seriously. In case of the performance of the turbine have been fixed and the generator's frequency is unable to be changed, the methods of air admission and the guide baffle are unruly adopted to decrdase the water pressure fluctuation in the draft tube. Up till now, it has not ripe experience for use at air admission and guide baffle because of the difference of turbine type and the limits of site conditions. The present writer designed kinds of guide baffles and different positions of air admission to be tested on the Three Gorges model turbine. The model test was carried out at the typical heads of Three Gorges turbine. The influence of efficiency, output, and results of decreasing the pressure fluctuation and frequency performance are showed.