悬臂式水下输送管道的水击分析

Analysis on Water Hammer of Cantilevered Underwater Pipeline

悬臂式水下矿石管道输送系统突然停泵发生水击,将对管道系统造成严重破坏。利用流体仿真软件,分析了其水击时稳态水力坡度线、水击包络线、水泵流量历时曲线、水泵转速历时曲线、止回阀节点水击压力等变化过程。结果表明:此系统突然停泵而引起水击,若没有安装止回阀,水泵发生严重的倒流和倒转现象;而安装了止回阀的系统,其水泵无倒转现象,且倒流流量小,只持续了很短时间;使用3 s快闭90%+8 s慢关10%的止回阀并未使水击水头超过正常工作水头;安装了止回阀后,水击的最大水头和最低水头的波动范围均明显增加。

For cantilever type underwater ore pipeline transport system suddenly stops pumping and water hammer occurs can cause serious damage to the piping system. Using fluid simulation software,the steady-state hydraulic grade line,water hammer envelope,pump flow duration curve,the pump speed duration curve,check valve node water hammer pressure were analyzed.The results show that system suddenly stops pump and causes water hammer,if the system does not install a check valve,which pumps serious back and reverse phenomenon,but system installed check valve has no reversal phenomenon,back flow is small,and only lasts for a very short period of time. The use of 3 s fast closing 90% ＋ 8 s slow closing 10% check valve does not make the water splashing into the water head over the normal work. After installing check valve,the fluctuation range of the minimum and maximum head of water hammer is significantly increases.