Diffusion Simulation Of Indoor Flammable Gas Leakage And Analysis Of Explosion Effects

Gas fuel is a high-quality, clean and efficient fuel, but it is also easily leak, inflammable and explosive. When a conventional leakage occurs in the limited space, because of the door and window ventilation, it will lead indoor gas concentration distribution to a non-uniform change process. In the non-uniform fuel concentration field, the flammable area is limited. Therefore, the research of indoor gas diffuse condition after leakage spread has a very important significance for the prevention and control of indoor gas accident.This article focuses on the following questions:First of all, the combustible gas geometric model of leak diffusion is established according to the common inhabitants kitchen size and the indoor gas diffusion state after leakage simulated by fluent6.3 Numerical simulation software. We can draw a conclusion about concentration distribution and velocity distribution of combustible gas in the interior diffusion process under different types, different gas leakage, different position, different ventilation leakage source conditions and the different export conditions.Secondly, experimental platform is built, the right physical experiment model established, the rule of the gas leakage concentration change at some point measured. Compare the numerical simulation results and experimental results and analyze the results of the two methods to get whether consider revising is good enough and see whether the error is very large. And then, according to the results of the similar experiment constantly, adjust the use of calculation model chosen in numerical simulation.Finally, basing the research and the analysis of the system, indoor gas leakage conditions, the change of diffusion area, the risk of fire accident is systematic analyzed and put forward effective measures about reducing indoor gas accidents. Also expect the potential powerful and harm of gas explosion after indoor gas leakage and put forward reasonable program in the design and practical construction and installation based on this.The following conclusions can be drawn according to study:①The into air velocity and exist area have significant influence on the state of gas diffusion after leakage. ②According to the experimental demonstration, standard k-εmodel is available for simulation of gas diffusion after leakage under low pressure status.③in the case of windows and doors closed, if the relief area is not enough and other condition keep the same, the hazards of leakage gas explosion is most serious. The building will be totally damaged, and people nearby will also take more risk.