可燃气体室内泄漏扩散的研究

对可燃气体在室内泄漏扩散的模式进行了分析,对泄漏扩散的影响因素进行了系统阐述,建立了连续泄放源气体泄漏扩散的数学计算模型,并分别对室内有风和无风干扰的情况下的模型进行了简化。通过建立数值计算模型,采用通用的CFD软件PHOENICS对泄漏气体射流扩散后形成的速度场与浓度场进行了模拟计算,得出了泄漏气体在室内扩散分布的一般特征。结果表明,在分析可燃气体泄漏的危险性时,不仅应分析环境空间可燃气体的爆炸浓度范围,而且也要注意存在局部着火的可能性。

Study of indoor flammable gas leakage processes

In this paper,indoor flammable leakage gas spreading model and influence factors are discussed,suitable mathematical model of continuous leakage source is set up and simplified on the condition with wind or without wind.Through the computation model,general CFD software PHOENICS is used to simulate the gas efflux speed and concentration fields.The principle laws of the indoor leakage gas spreading are obtained.The results indicate that when flammable gas risk is analyzed,both the flammable gas explosion scopes in the environment space and local fire possibility should be paid attention to.