输水管道水流对截留气团的冲击

Impact pressure of pipeline water flow on detained air mass

从试验、数值计算、理论分析三方面对输水管道系统水流冲击截留气团(囊)进行了研究。试验结果表明,水流冲击截留气团的最大压力与截团在一个大气压下的初始体积占管道总体积的比例多少有关。试验与数值计算结论相符。同时指出,在无法确定输水管道系统截留气团大小时,可采用忽略摩阻的刚性水锤模型进行计算,所得结果与输水管道系统截留气团大小无关,且偏安全。

Experiments, numerical calculation and theoretical analysis are carried out to study the impact pressure of water flow on detained air mass in pipeline. It is found that the impact pressure may be maximal when the ratio of initial air volume, under standard atmospheric pressure, to total volume in pipeline reaches a certain value. The experimental data are accord with the calculated results. In case the initial air volume is unknown the rigid water hammer model can be adopted as the calculation model, in which the friction is neglected. The volume of air will not affect the calculation result.