论文部分内容阅读
通过分析滑移系数两种定义形式的不同,可以得到流动滑移量是滑移系数计算的关键.考虑由粘性效应引起的边界层堵塞的影响,由边界层理论对离心泵叶片表面的边界层进行求解,计算出边界层位移厚度,从而对叶轮流动滑移量进行了修正,使滑移系数的计算更为精确.通过对一组离心泵的滑移系数和扬程的实际计算,结果表明:由于叶轮表面边界层堵塞的影响,使滑移系数计算值减小,使计算出的理论扬程和实际扬程也相应减小,与实验值更为接近.
By analyzing the difference of the two definitions of slip coefficient, it can be concluded that the slip of flow is the key factor of slip coefficient calculation.Considering the effect of boundary layer clogging caused by viscous effect, the boundary layer theory is applied to the boundary layer of centrifugal pump blade surface The displacement of the impeller is corrected and the calculation of the slip coefficient is more accurate.Based on the calculation of the slip coefficient and lift of a set of centrifugal pumps, the results show that: Due to the blockage of the boundary layer on the impeller surface, the calculated value of the slip coefficient is reduced, so that the calculated theoretical lift and actual head are correspondingly reduced, which is closer to the experimental value.