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(一)前言双击式水轮机与其它型式的小型水轮机相比,具有结构简单、造价低及维护方便等优点,而且在带部分负荷时能稳定运行,平均效率较高,特别适用于径流式小型水电站。双击式水轮机转轮宽度B与其直径D_1的比值(B/D_1)取决于使用水头,它的大小不影响水力效率,即不存在最优的B/D_1值;目前,B/D_1=0.315～3.55,比转速m_4=50～200m·kW。对于同一叶片形线及转轮直径的双击式水轮机,只要取不同的B值就可以得到不同的比转速而用于不同的范围,因而有
(A) Preface Double-click turbine with other types of small turbines compared with the simple structure, low cost and easy maintenance, etc., and with a part of the load can be stable operation, high average efficiency, especially for small-scale radial-flow hydropower station . The ratio of the width B to the diameter D_1 of the double-action turbine (B / D_1) depends on the head used, and its size does not affect the hydraulic efficiency, that is, there is no optimal B / D_1 value. Currently, B / D_1 = 0.315 ~ 3.55 , The specific speed m_4 = 50 ~ 200m · kW. For the double blade turbine with the same blade shape and wheel diameter, different specific rotational speeds can be obtained for different ranges by taking different B values. Therefore,