输气管道泄漏仿真

Leakage Simulation of Gas Transmission Pipeline

基于管道瞬变流机理模型,在气体泄漏为亚声速流动的情况下,通过引入附加边界条件,仿真研究了泄漏位置和泄漏量对管输气体流动参数的影响。结果表明:当泄漏量增加时,上下游压力下降幅度均增大,上游流量上升幅度增大,下游流量下降幅度增大,但泄漏量的变化仅使压力和流量波幅发生变化,没有影响其波形;当泄漏位置从靠近管道末端移至管道中间位置时,上下游压力下降幅度均减小,上游流量上升幅度减小,下游流量下降幅度增大,同时使波形发生了变化,上游压力波形后置,下游压力波形前置,上游流量波形的周期增大,下游流量波形的周期减小。

Based on the transient model of gas transmission pipeline,in the sub-sonic case of leakage,simulation is done with extra-boundary condition and the impact of leakage position amount on flow parameters is studied The result shows that when leakage amount is increased,the pressure change of both the upstream and the downstream will be enhanced.In more details the upstream pressure increase will become larger and the downstream pressure drop will enlarge.However,the change of the leakage amount causes the change of the amplitude of pressure and the flow rate only,not the wave shape of those ones When the leakage position moves from the end to the middle of pipeline,it will make the pressure change of both the upstream and the downstream smaller,the upstream flow rate increase becomes smaller and the downstream flow rate drop becomes larger.At the same time,it varies the wave shape,the upstream pressure wave is lagged and its periodicity increases.On the contrary,the downstream pressure wave is preceded and its periodicity decreases.