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一、前言由叶片式水力机械的欧拉方程: H_T=1/g(u2v2cosa_2-u_1v_1cosa_1)变换得: H_T=u2/g(u2-(ctgβ_2)/(πD_2b_2) QT)可以看出,在其它条件不变的情况下,理论扬程随着叶片出口安放角β_2的增大而提高。这一情况表明加大β_2能缩小叶轮直径,缩小泵的体积。同时对比转数较低以及外径限制很严的深井泵,这种要求尤其迫切。但同时又认为,叶片出口角小(β=14～35°)的泵
I. Preface The Euler equation of a vane-type hydromechanical machine is: H_T = 1 / g (u2v2cosa_2-u_1v_1cosa_1) Transforms: H_T = u2 / g (u2- (ctgβ_2) / (πD_2b_2) QT) It can be seen that under other conditions In the constant case, the theoretical lift increases with the increase of the exit angle β_2 of the blade. This situation shows that increasing β_2 can reduce the impeller diameter and reduce the volume of the pump. This requirement is especially urgent when comparing deep well pumps with low rpm and tight outside diameter limits. At the same time, however, it is also believed that the pump has a small exit angle (β = 14-35 °)