离心泵圆盘摩擦损失计算

圆盘摩擦损失严重影响离心泵尤其是低比转数离心泵的性能，准确计算其大小是预测离心泵性能的重要基础之一。虽然计算离心泵圆盘摩擦损失的公式较多，但实际计算表明这些公式的计算结果都存在较大偏差。通过对不同圆盘摩擦损失计算公式的比较与分析，提出了不同比转数的离心泵圆盘摩擦损失计算应采用不同的公式。以优秀离心泵为基础，采用回归分析的方法修正了圆盘摩擦损失的计算公式。实例计算表明修正后的圆盘摩擦损失公式计算结果更准确，为工程实际应用提供了一种准确的计算方法。

Calculation of disk friction loss of centrifugal pumps

Disk friction loss has great effects on the performance of centrifugal pumps, especially on the performance of low specific speed centrifugal pumps. So to calculate it correctly is very important and is one of significant bases for characteristics prediction of centrifugal pumps. Although there are many kinds of disk friction loss formulas, practical computation indicates that the results of these formulas are not exact and the windages can not be neglected. In this paper, different disk friction loss formulas are compared and the paper concludes that disk friction formula should be chosen according to specific speed. Based on the excellent centrifugal pump model, the chosen formulas are amended by regression analysis and the calculation coefficients are given in the ways by specific speed, capacity and revolution speed. At last, seven centrifugal pump models are chosen to check up the regression analysis results and the practical application indicates that the regression analysis results are exact and the results offer a new and exact calculation method for engineering practical application.