Abstract: Accurately predominate the gas leakage diffusion dynamics under coupled effects of multiple temperature and humidity has very important significance to the accurate grasping of the law about leakage diffusion and the really expressing the concentration field distributions under coupled effects of multi-factors in the actual geographic space. On the theoretical basis of non-equilibrium statistical thermodynamics and irreversible thermodynamics, the diffusion model under coupled effects of temperature gradient as well as temperature and humidity gradient was established. And combined with the model of gas leakage diffusion in limited space, the mathematical model of gas leakage diffusion under coupled effects of multi-factors was determined. Then through the Matlab software, the simulation analysis of the process about the gas diffusion indoor was conducted. The influence law, of which temperature and humidity gradient and the coupled effects work on gas leakage diffusion was obtained through the analysis. The research results can provide reference to the study of gas leakage diffusion law as well as the safely evacuation of the stuff when there is an emergency.

Key words: Temperature gradient, Moisture gradient, Gas diffusion, The concentration field, Simulation

摘要： 　以非平衡统计热力学和不可逆热力学为理论依据，建立温度梯度和湿度梯度耦合情况下扩散模型，结合受限空间内燃气泄漏扩散模型，建立多因素耦合作用下燃气泄漏扩散数学模型，并运用Ｍａｔｌａｂ软件对室内燃气扩散过程进行了模拟分析。通过分析得到了温度和湿度梯度对燃气泄漏扩散的影响规律以及耦合作用下对燃气泄漏扩散的影响规律。研究结果将为燃气扩散规律的研究及事故发生时人员及时安全的进行撤离提供参考。

关键词: 温度梯度 , 湿度梯度 , 燃气扩散 , 浓度场 , 模拟