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排灌机械工程学报
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排灌机械工程学报  0, Vol. Issue (): 19-    DOI:
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水力干扰法减弱尾水管低频压力脉动试验研究?
李章超1,常近时1,魏显著2,赵越2
(1. 中国农业大学 水利与土木工程学院, 北京 100083; 2. 哈尔滨大电机研究所, 哈尔滨150040)
Experimental study of mitigation of low frequency pressure fluctuation in draft tube using hydraulic disturbance method
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摘要   为了解决大型混流式水轮机在部分负荷工况下运行时由尾水管内螺旋涡带引起的低频压力脉动问题,引入了一种简单有效的减弱涡带降低尾水管低频压力脉动的方法— —水力干扰法。采用模型试验的方法,在混流式水轮机模型机上设计了实现水力干扰的结构,在实施水力干扰和无水力干扰条件下对模型水轮机压力脉动进行了测试。分析了不同的部分负荷工况下水轮机的压力脉动幅值和频率特性,研究了水力干扰法减弱尾水管低频压力脉动的效果。研究表明,在无水力干扰条件下,尾水管中存在螺旋涡带并引起尾水管壁处强烈的低频压力脉动,其频率约是1/5转频,该低频压力脉动是引起水轮机不稳定运行的主要原因;在实施水力干扰后,尾水管中低频压力脉动有明显减弱,水力干扰对尾水管中压力脉动频率影响不明显。研究为减弱尾水管压力脉动提出一种新的思路,可提高混流式水轮机运行稳定性。
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关键词混流式水轮机   水力干扰   尾水管涡带   压力脉动;模型试验     
Abstract:  In order to solve the problem of the low-frequency pressure pulsation of large Francis turbine draft tube caused by spiral vortex rope at part load operation, a simple and effective method which can weaken the vortex rope, called hydraulic disturbance, was introduced. Using the model test method, a structure for hydraulic disturbance was designed on a model turbine, and pressure fluctuation tests with hydraulic disturbance and without were carried on. The pressure pulsation amplitude and frequency characteristics at different part loads were analyzed, and the mitigation effect of pressure fluctuation with hydraulic disturbance method was studied. Studies have shown that without hydraulic disturbance there is a vortex rope in the draft tube, whose frequency is about 1/5 rotating frequency, which causes strong low frequency pressure fluctuation near the wall of draft tube, and this low frequency pressure fluctuation is the main reason for the unsteady operation of the turbine. While with hydraulic disturbance the amplitude of the low frequency pressure fluctuation is significantly reduced, but the frequency of pressure fluctuation is not changed obviously. A new way of reducing pressure fluctuation in the draft tube is presented, by which the operation stability of Francis turbine can be improved.
Key wordsFrancis turbine   hydraulic disturbance   vortex rope   pressure fluctuation   model test   
引用本文:   
. 水力干扰法减弱尾水管低频压力脉动试验研究?[J]. 排灌机械工程学报, 0, (): 19-.
. Experimental study of mitigation of low frequency pressure fluctuation in draft tube using hydraulic disturbance method[J]. Journal of Drainage and Irrigation Machinery Engin, 0, (): 19-.
 
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