压力管道中有压气囊运动的试验研究

为探讨压力管道中滞留气囊运动引起压力振荡的影响因素，更全面地表征气囊运动的瞬态效应，区别于以往简单管道系统末端的无压气囊运动试验，以较为复杂的试验管道系统的有压气囊为研究对象，探讨了不同流量和不同气囊体积条件下气囊运动引起的升压规律。试验结果表明：管道系统流量及气囊体积这两个单因素与气囊通过末端阀门产生的最大升压均不成线性关系，而是成上凸形抛物线关系；末端阀门的开度、气体排出引起的水体流速梯度变化、剩余气囊的缓冲作用三者共同决定最大升压值。

Experimental study on movement of pressurized air pockets in a pressure pipeline

To explore the influencing factors of pressure oscillation induced by the movement of entrapped air pockets in pressure pipelines, and to fully characterize the transient effects of air pockets motion, pressurized air pockets in a more complex experimental piping system were studied, which was different from previous experiments based on the discharge of non-pressurized air pockets at the end of a simple piping system. The law of pressure boost caused by the movement of air pockets under different flow and volume conditions was discussed. The experimental results show that the single influencing factor of system flow rate and air pocket volume on pipeline pressure is not linear, but presents a convex parabola relationship. The maximum pressure boost value is determined by the opening of the end valve, the change of water velocity gradient caused by gas discharge, and the buffering effect of the remaining air pockets.