对无压圆管通过最大流量时的充满度,有h/d=0.95和h/d=0.938两种说法。本文阐述了产生这两种结论的原因,得出h/d:0.95的结果是因为在推导过程中假设C=(1/n)R~(1/6)为常数,而推导h/d=0.938只设i、d、n为常数。此文认为,C不应为常数,它随水力半径R而变化,故h/d=0.938更为合理。 There is h / d = 0.95 and h / d = 0.938 for the fullness of pressureless tube passing the maximum flow rate. The reason why these two kinds of conclusions are produced is shown in this paper. The result of h / d: 0.95 is that the assumption that C = (1 / n) R ~ (1/6) is constant in the derivation and h / d = 0.938 only set i, d, n is a constant. This article believes that C should not be a constant, it varies with the hydraulic radius R, so h / d = 0.938 more reasonable.