The Diffusion Condition Simulation And Consequence Analysis Of The Indoor Gas Leakage

In recent years, with the requirements of environmental protection and the improvement of living conditions, fuel gas, such as manufactured gas, LPG, natural gas and other fuels gradually become the main fuel of the city life. Meanwhile, the application in industrial field is constantly expanding. The characteristics of the gas fuels is easy to leak, flammable and explosive. When the leak of these flammable gas in the limited indoor space occurs, it will increase the risk of fire. At the same time, as the specific gravity of fuels is different from the air and the ventilation condition is limited indoors, the concentrations distribution in the room is a non-uniform change process. While the fire and explosion occurs under a certain concentration limit. The combustible region is limited in the non-uniformity fuel concentration. Therefore ,to prevent and control the occurrence of indoor fires , it is of great significance to systematically study the leakage process and proliferation of indoor gas , the spread of combustible region and the risk of fire.In this paper,the actual living environment of the residents(two rooms and two halls) is regarded as the research object. After comparision and analysis the diffusion models, determine to use the k-εdouble-equation turbulence model which modified by buoyancy. Then, using PHOENICS3.5 to simulate diffusion process of the indoor gas leakage to complete the diffusion process simulation of both the natural gas and LPG. Finally, analyze the consequences including the region of explosion concentration and the leakage conditions of the explosion concentration region .