Numerical Simulation Of Indoor Gas Leakage In Civil Buildings

In order to study gas leakage in the general civilian residential building indoor’s, to prevent and to control the general household gas fire and explosion accident after the incident to effectively, this paper intends to regard general civil construction households as the research space, methane gas as the research object, using3D k-e turbulence as the basis of the model, using computational fluid dynamics (CFD) as the analysis tool, using Ansys as the simulation software, to establish of indoor kitchen and bedroom which is linked to the living room area as the geometry model. I will do different working conditions of the natural gas leakage after the indoor dynamic distribution, distribution, concentration area for simulation calculation and analysis, get the gas under different conditions after the leak, the living space of the dynamic distribution and diffusion process, including the different time periods in the explosion limit range area. Since the gas density is less than the density of air, natural gas leakage diffusion velocity in the vertical direction than in the horizontal direction of the diffusion speed, easy to accumulate in the upper room. Leakage of natural gas volume fraction distribution region reaches the explosion limit is a certain thickness of the level of regional. Different operating condition simulation mainly is the main influence factors on the leakage of natural gas to the classification, this paper mainly studies the following several factors.Natural gas leakage hole size and leakage rate are the main factors affecting the leakage of natural gas. When the leaking hole is large, will result in a very short period of time in many areas are to achieve indoor explosion limit, leak size corresponding to different time different relief, deal with different measures of accident.Obstacles, mainly is the interior doors and windows and the leak near the exit barrier bag, when the kitchen inside the door is closed or the kitchen to the living room and bedroom channel obstacle is more, on the distribution of natural gas in its vicinity, accumulation may lead to natural gas, which also affected the dynamic distribution of natural gas in the whole space them.The outdoor wind speed effect, ordinary people feel little leakage indoor and outdoor, if only to open the kitchen window has not achieved significant results, but in fact, the outdoor wind will have great influence on the gas leakage rate and all dynamic distribution in different wind conditions, will produce a dilution effect.Several main factors in this paper mainly for indoor natural gas leakage was simulated under different conditions, and different time, different dynamic distribution and area of explosion analysis results, the influence of different factors, and in different circumstances, to the indoor gas leakage safety accident and put forward the corresponding suggestion.