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叶片出口角β_2(β_(2■)是影响水泵效率的又一个重要参数,从提高效率的角度出发,希望β_(2■)取得小些好,这样可减少压水室中的汇流撞击损失。但β_(2■)的选取又与比转速有关,对于低比转速的泵β_(2■)值大,高比转速的泵β_(2■)值小。另外,取小的β_(2■)扬程曲线下降快,不会出现影响稳定运行的驼峰,且功率曲线平坦,对用户有利。因此,根据计算并参照国内比转速相近性能较好泵的β_(2■),选取小值。7种新设计的湘农离心泵β_(2■)的选取值见表6。另外,加大叶片包角,能增加叶轮流道的有效长度,减小流道扩散角,保证能量的充分转换,减小轴向旋涡损失及流道扩散损失。设计中,我们参照国内
The blade outlet angle β_2 (β_ (2)) is another important parameter that affects the efficiency of the pump. From the viewpoint of efficiency improvement, it is desirable to make the β_ (2_) smaller and to reduce the bus collision loss in the pressurized chamber. However, the selection of β_ (2 ◦) is related to the specific speed, and the value of β_ (2 ◦) for the pump with low specific speed is large and the value of β_ (2 ◦) for the pump with higher specific speed is smaller.In addition, ) The lift-off curve of the pump is fast, there will be no hump which will affect the steady operation, and the power curve is flat, which is good for the user. Therefore, select a small value based on calculation and reference to β_ (2 ■) The newly designed Xiangnon centrifugal pump β_ (2 ■) selected values shown in Table 6. In addition, increase the blade wrap angle, can increase the effective length of the impeller flow path, reducing the flow channel diffusion angle, to ensure the full conversion of energy , Reduce the loss of axial vortex and runner diffusion loss.In the design, we refer to the domestic