大口径有压玻璃钢管当量粗糙度取值

针对大口径有压玻璃钢管当量粗糙度取值问题, 采用计算分析方法, 判别不同工况下大口径玻璃钢管道管内水流流态, 验证了当量粗糙度对其水力计算的重要性; 在此基础上, 以新疆小洼槽倒虹吸管道为例, 利用齐恩公式、哈兰德公式, 计算不同当量粗糙度取值情况下各工况的水头损失值, 将计算结果与实测数据作比较分析和误差分析, 结果表明, 大口径有压玻璃钢管在一般工况下管内水流流态基本处于紊流过渡区, 大口径有压玻璃钢管道当量粗糙度取值范围宜为0. 005~ 0. 01 mm。

Value analysis for equivalent roughness of pressure FRP pipe with large diameter

In terms of the value pr oblem fo r the equivalent ro ug hness of pr essure FRP pipe with lar ge diameter , the water flowreg imes o f FRP pipe under different wo rking co nditions w ere analyzed using the calculation method, w hich ver ified the impor2tance of equiv alent ro ug hness to hydr aulic calculatio ns. On the basis, JiEn formula and H aaland formula w ere used t o calculat ethe head loss of small t roug h inv erted siphon with differ ent equiv alent roug hness v alues under each wo rking conditio n. The cal2culation results w er e compared with the measured data, which sug gested that the flow r eg ime in the pr essure FRP pipe withlar ge diameter is usually in the t ur bulent tr ansit ion zo ne, and the equiv alent ro ug hness is about 0. 005 to 0. 01 mm for t he pres2sure FRP pipe with lar ge diameter.