管道阻力的直接计算法

DIRECT CALCULATION OF RESISTANCE OF DUCTING

关于流速未知（或管径未知）以及流速和管径均未知的管道阻力计算，现行（化工原理）（化工基础）教材和有关文献介绍的是试差法和间接计算法求解，本文介绍了一种较以上两种计算方法更简便的一步直接计算法。

For the calculation of resistance of ducting when either flowrate or pipe diameter is unknown or both of them are unknown, the test-difference and indiredt-calculation methods are used in present-day teaching materials and relevant clocuments. This paper offers the direct-calculation mothod, which is simpler than the two mentioned above.