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

The development of the economy is inseparable from the support of energy. Natural gas has attracted attention across society because of the depletion of the oil resource.it is a clean energy and so abundant. More and more residents use natural gas as major energy. It brings great convenience to our life, at the same time, it brings dangerous to us. As a kind of combustible gas, it might very well lead to leakage when we lay down gas pipes and use the gas stove. Given enough time, natural gas spreads through all the room. This would cause explosion when we ignite the natural gas. Explosion would result in an irretrievable injury to the room and the people in the room. Because of that, research the law of indoor natural gas leakage & diffusion and analysis the consequences after the explosion are greatly significant to ensure the gas transmission distribution network running normally and make good use of natural gas.This paper researches the indoor natural gas leakage accident. We use FLUENT to simulate the diffusion of indoor gas leakage, through this, we can obtain the law of indoor natural gas leakage under different factors and we can analysis the consequences after the explosion. The main contents could be summarized as follows: through summarize and compare the present models of natural gas leakage & diffusion, we can determine the suitable model for this paper; we get the governing equations of indoor natural gas leakage & diffusion which include mass conservation equation, momentum conservation equation, energy conservation equation, species transport equation and methane-air mixtures density equation, then we discrete it by finite volume method. We use FLUENT to simulate the indoor natural gas leakage & diffusion in the gas stove with the buoyancy correction k- ε turbulence model; wo can obtain indoor natural gas distribution in different conditions. These conditions are as follows: changing the flow leakage, leakage time, outdoor wind velocity as well as leakage refrigerant; continuous leakage gas will lead to explosion when reach a certain concentration of higher than 2% which considered as dangerous areas, we calculate TNT equivalence, overpressure wave and damage radii with TNT equivalent weight method, according to the rules of the overpressure wave, we analysis the harm to the room and the people in the room.This paper analyses different conditions which can influence the law of indoor natural gas leakage & diffusion based on the present researches. Use the method of numerical simulation, obtain the law of indoor natural gas leakage & diffusion in different conditions; use the method of engineering, calculate the consequences of the explosion, these have great practical meanings for the engineering gas explosion analysis and residents’ safety gas.