高比转速混流泵叶轮设计方法

Design method for impeller of high specific speed mixed-flow pump

基于二元理论,用FORTRAN语言编程实现了高比转速混流泵叶轮的水力设计.给出采用流线迭代法求解轴面流动,应用逐点积分法进行叶片绘形,在轴面上进行叶片加厚和在保角变换平面上进行叶片头部、尾部修圆的基本理论和方法;讨论了轮毂比、速度矩分布函数、叶片进出口边位置等对设计计算结果的影响.该方法有效地提高了设计效率,具有设计计算精度高、得到的叶片表面光滑、叶片表面数据齐全、便于数控机床加工制造等特点,为高比转速混流泵系列叶轮的研发提供了一个平台.

Based on the two-dimension theory, a computer code is made in FORTRAN language to design the high specific speed mixed-flow pump. The theory and method in calculating meridional velocity distribution by streamline iteration, drawing blade shape by point-by-point integration, thickening blade and smoothing leading edge and trailing edge of the blade by conformal mapping are introduced. The effects of several parameters on the designed impeller shape are also discussed, including hub/shroud radius ratio, velocity moment distribution function on the meridional streamline, position of blade inlet and outlet edge. This computer code can increase the efficiency of design work and the accuracy of calculating results. The data of the blade's surface is complete which is convenient for blade manufacturing by numerical control machine. It provides a useful tool for designing the impeller of high specific speed mixed-flow pump.