基于FLACS的天然气泄漏扩散数值模拟研究

Numerical simulation of gas leakage diffusion based on FLACS

为研究天然气泄漏扩散达到稳定状态时的规律,基于某天然气储罐区,使用FLACS软件进行厂区CFD建模,然后设置不同风速、泄漏速率,对天然气泄漏扩散达到稳定状态后的浓度、速度分布规律及等效可燃气云体积Q9随时间的变化规律进行分析。结果表明:随着横向风速增大,浓度扩散最远距离变小,浓度云图向下风向倾斜的趋势越明显,速度矢量在U方向的分量分布在射流对称轴两侧方向不同,在V方向的分量分布与浓度分布类似,Q9最大值随横向风速增大变小,且波动幅度增大;随着泄漏速率增大,浓度扩散最远距离变大,速度矢量在U方向的分量分布面积增大,呈“蝴蝶”状,在V方向的分量分布距离变大,Q9最大值随泄漏速率增大而增大。

In order to study the law of natural gas leakage dispersion when it reaches the steady state,based on a gas storage tank area,using FLACS factory CFD modeling software,and set different wind speed,leakage rate,the gas leakage diffusion after reaching steady state concentration,velocity distribution and equivalent gas cloud volume Q9changing with the time are analyzed.The results show that the maximum distance of concentration diffusion decreases with the increase of transverse wind speed,and the trend of concentration cloud is more obvious.The components of the velocity vector in the direction of U are different on both sides of the jet symmetry axis,and the component distribution in the direction of V is similar to the concentration distribution.The maximum value of Q9 decreases with the increase of transverse wind speed,and the fluctuation amplitude increases.As the leakage rate increases,the maximum distance of concentration diffusion increases,and the component distribution area of the velocity vector in the direction of U increases in a"butterfly"shape.The component distribution distance in the direction of V increases,and the maximum value of Q9 increases with the increase of the leakage rate.