Abstract: 　In order to study the dynamic process，damage of liquefied natural gas (LNG) leakage and diffusion(LNG), a Gaussian smoked mixture model with point source continuous leakage modified by Gaussian smoke group model was selected and programmed by MATLAB software to study different grounds. Half of the lower limit of the explosion(1/2LFL), the lower limit of explosion (LFL), and the upper limit of the explosion (UFL) corresponding to different factors, and the influence of the factors such as the effective height of the leakage source on the leakage of LNG gas and the analysis. And the experimental models were verified by Burro No. 9,The results show that the range of the danger area decreases with the increase of the surface roughness. With the increase of the effective height of the leakage source, the concentration of the highest point is decreasing and the danger is reduced at the same time. The scope of the area will continue to decrease.Due to the different wind speed, in the early stage of LNG leakage, the greater the danger area, the greater the wind speed. After the state of the gas cloud is stable, the area of the dangerous area decreases with the increase of wind speed.

Key words: LNG leakage, Gauss smoke mixture model, MATLAB, Hazardous area division

摘要： 为了研究液化天然气（LNG）泄漏扩散的动态过程及其危害，选择由高斯烟团模型进行修正得到的点源连续泄漏的高斯烟团混合模型，并利用MATLAB软件对其进行编程，研究了不同地面粗糙度、泄漏源有效高度等因素对LNG气体泄漏扩散的影响，分析确定了不同因素所对应的1/2爆炸下限（1/2LFL）、爆炸下限（LFL）、爆炸上限（UFL）危险区域的面积，并利用Burro 9号实验进行了模型验证。结果表明，危险区域的面积随着地面粗糙度的增大呈减小的趋势；随着泄漏源有效高度的增加，最高点的体积分数不断降低，同时危险区域的面积不断减小；在LNG泄漏初期，风速越大危险区域面积越大，在气云的状态达到稳定以后，危险区域的面积随着风速的增大呈减小的趋势。

关键词: LNG泄漏, 高斯烟团混合模型, MATLAB, 危险区域划分