水电站长输水道管流气泡动力特性研究

Study on gas liquid transient flow caused by emptying of surge tank

本文以水电站瞬变过程中调压室漏空压力钢管中的气液两相流作为研究对象，在模型实验的基础上，探讨了气泡对管道水压变化的影响及其数学描述．由流动的连续性，导出了瞬变过程中计算调压室进气流量的公式；引入了气团质点的新概念，将每一时间步长内进入压力管道的空气视为一个质点；发展了用拉格朗日研究固体质点运动的方法研究气团质点在管道中运动的原理和方法；研究了采用Ｗｙｌｉｅ的自由气体———离散模型计算瞬变压力变化过程．数值计算和模型实验数据的对比表明，本文所发展的数学模型能够较好地描述调压室漏空压力钢管中气液两相流的压力变化过程．

In this paper the gas\|liquid transient flow caused by emptying of surge tank is studied.The formula for computation of the air discharge from a surge tank into the down stream pressurized pipeline is proposed.A new concept of gas particle is introduced to determine the gas distribution in the pipeline with the help of Lagrange method.The discrete gas\|liquid model is used to calculate the water pressure in the pipeling.The comparison of the calculation result with test data verifies that the mathematical model developed herein is applicable for estimating the water pressure in the gas\|liquid transient flow.