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在水轮机制造行业中,确定水轮机转速的现行方法是导出每种型号水轮机的比转速和净水头之间的经验公式。因而,水轮机转速变成水头、直径和转轮进口速度的函数。前两篇文章中,作者阐明了转轮叶片数目对水轮机装置有直接影响。叶片数目也影响到水轮机的转速。本文将表明,在考虑了转轮叶片的数目和尾水管型式后,有可能导出一个更精确的水轮机转速方程。该方程能用于各种类型的反击式水轮机。(明槽式、灯泡式、卡普兰式、定浆式和混流式)这个新的方程是在对于155台水轮机组分析的基础上而建立起来的。 Schweiger和Gregori导出了比转速的最新公式,如下所示比转速n_q和水头h之间的三
In the turbine manufacturing industry, the current method of determining the turbine speed is to derive the empirical formula between the specific speed and the head of each type of turbine. Thus, the turbine speed becomes a function of the head, diameter and runner inlet speed. In the first two articles, the author clarified that the number of rotor blades has a direct effect on the turbine installation. The number of blades also affects the speed of the turbine. This article will show that taking into account the number of runner blades and draft tube type, it is possible to derive a more accurate turbine rotational speed equation. The equation can be used for various types of impact turbines. (Open Groove, Bulb, Kaplan, Stirred and Francis) This new equation is based on the analysis of 155 turbine units. Schweiger and Gregori derived the latest formula for specific speed, as shown below for ratio between speed n_q and head h