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反击式水轮机的出流条件,受蜗壳、尾水管和转速变化的影响,本不同于冲击式水轮机,即其过流特性与通过喷嘴射入大气中的孔日出流不同,因而两种水轮机的水击计算方法也是不同的。目前,在设计和生产单位,对反击式水轮机水击压力计算方法的选用,任意性较大,这就不能不影响计算精度,本文拟通过简要的论述及省内外若干工程实例,说明各方法间存在的差异,目的是使设计成果更符合反击式机组的客观实际。一、反击式水轮机水击计算方法按出流规律的不同目前所采用的方法大体分三种: 第一种:采用和冲击式水轮机相同的方法即:按孔口出流规律,楣对速度
The outflow conditions of the impact turbine are different from those of the impact turbine due to the influence of the volute, the draft tube and the speed variation. That is, the overcurrent characteristics of the impact turbine are different from the sunrise currents of the holes injected into the atmosphere through the nozzle. Therefore, The calculation method of water hammer is also different. At present, in the design and production units, the selection of the calculation method of the water hammer pressure of the impact turbine is arbitrary, which can not but affect the accuracy of the calculation. This article intends to illustrate the methodological differences between the methods through a brief discussion and some engineering examples inside and outside the province The difference exists to make the design more in line with the objective reality of the counterattack. First, the calculation method of impact water turbine water hammer According to the different current law used in the current method generally divided into three types: The first: the same method and the impact of the turbine namely: according to the orifice flow law,