燃气泄漏扩散过程的模拟研究  

Simulation research on the leakage and diffusion process of indoor combustible gas

作　　者：王国磊[1] 田贯三[1] 张增刚[1] 贾文磊[1] 

机构地区：[1]山东建筑大学热能工程学院,山东济南250101

出　　处：《山东建筑大学学报》2010年第6期576-580,612,共6页Journal of Shandong Jianzhu University

基　　金：国家自然科学基金项目(50878122)

摘　　要：室内可燃气体泄漏后与空气形成混合气体,容易引发爆燃或爆炸等危险事故,考虑到居民常使用燃气种类有天然气和液化石油气,采用雷诺平均的N-S方程,k—ε湍流模型以及组分输运模型方程,利用CFD技术对二者在有限空间内的泄漏扩散过程进行模拟研究,并与实验结果相比较,对比分析二者在不同泄漏工况下的泄漏扩散规律,结果表明:在泄漏的初始时刻,天然气和液化石油气形成的爆炸危险区域分别在房间上部和下部;液化石油气泄漏后很快就会在整个房间形成爆炸危险区域;通风口加速了泄漏天然气的排放,但房间内始终会存在一定厚度的爆炸危险区域。两种可燃气体在泄漏后形成的爆炸危险区域的分布差异,可为制定室内可燃气体危险事故的预防措施提供参考。The leakage of indoor combustible gas is mixed with indoor air and easily leads to detonation or explosion or other dangerous accidents.For the reason that natural gas and liquefied petroleum gas are usually used by inhabitants,the Reynolds averaged Navier-Stokes equation,the turbulence model equation,the species transport equation and computational fluid dynamics technologies are used to numerically simulate the leakage and diffusion process of natural gas and liquefied petroleum gas.Simulated results are compared with experimental results and the regularities of the leakage and diffusion in different conditions are analyzed.The results show that at the initial stage of leakage,the explosive dangerous areas of NG and LPG locate at top and bottom.In a very short time,the LPG′s concentration in room forms an explosive dangerous area.The NG′s concentration reduces faster with the function of ventilation opening,but there is always an explosive dangerous area of a certain thickness.Distribution differences of explosive dangerous areas can provide reference for preventing dangerous accidents caused by indoor combustible gas.

关 键 词：燃气 泄漏扩散 数值模拟 爆炸危险区域 

分 类 号：TU996[建筑科学—供热、供燃气、通风及空调工程]