By using the fixed point iteration method to solve the Colebrook-White formula,the three formulas for calculating water head loss stipulated in the current water supply and drainage standard are compared and analyzed.It is found that in the calculation of old steel pipe,the error between the calculation result and the Colebrook-White formula can be reduced by using the correction formula of the Hazen-Willians coefficient in different flow rate range.However,when similar corrections are made using pipes other than old steel pipes,the error is even greater.In addition,the inconsistencies of the values of Hazen-Willians coefficient and equivalent roughness in the Current stand-ard are also one of the reasons for the large errors in the calculation results of the Hazen-Willians formula and the Colebrook-White for-mula.
关键词
舍维列夫公式/海澄-威廉公式/柯尔勃洛克-怀特公式/水头损失/海澄-威廉系数/当量粗糙度
Key words
Sevilev formula/Hazen-Willians formula/Colebrook-White formula/Water head loss/Hazen-Willians coeficient/Equiva-lent roughness
维普
万方数据