论文部分内容阅读
本文利用特征线法,对同一时刻的调压井内涌浪高度和通过井下阻抗孔穿透到上游引水管道内的压力进行了联合计算。令最大涌浪高度和发生在引水管末端的最大水锤压力相等。在此准则下决定出与阻抗孔的几何尺寸及位置有关的最优阻抗系数,给出了最优阻抗系数随关闭时间而改变的一组曲线。结合几个例子详细讨论了如何选取开、关阀时的最优阻抗系数。
In this paper, the characteristic line method is used to calculate the surge height in the surge tank at the same time and the pressure penetrated into the upstream water diversion pipe through the downhole impedance hole. Make the maximum surge height equal to the maximum water hammer pressure that occurs at the end of the manifold. Under this criterion, the optimal impedance coefficient related to the geometric size and position of the impedance hole is determined, and a set of curves that the optimal impedance coefficient changes with the closing time is given. With several examples, we discuss in detail how to choose the optimal impedance coefficient when opening and closing the valve.