| There are all kinds of hidden danger in the chemical products' production,use,storage,transportation and so on,in the process,major flammable and explosive,poisonous and harmful gas leakage accident occurs frequently,and always with different degree of casualties and property losses and damage to the ecological environment.Heavy gas because of its high density,gravity in diffusion,it is near the ground out to stay a long time,if the leakage of poisonous and harmful gas,such accident injury to the source of leakage around the crowd.It is for this reason,the heavy gas leakage diffusion has been as a special issue to study.For the study of heavy gas diffusion law,this article in view of the heavy gas leak diffusion problems are studied,SF6 as the research object,the experimental model is established according to the similarity theory and dimensional harmony theory,and under the condition of different wind speed and the height of the leak of SF6 gas diffusion experiment,the application of dimensional analysis on the experimental data measured by statistical analysis,and thus using mathematical software MATLAB calculation equations,the experiment of gas leakage diffusion equation is deduced,and the income out of the equation validated with other groups of data.Using the fluid dynamics CFD software Fluent,the gas in the corresponding numerical simulation experiment under the influence of environmental conditions,diffusion,first before processing software Gambit to establish the geometric model of Fluent software,and grid,and then set boundary conditions and initial value,to compare the numerical simulation results and experimental results to verify the accuracy of the experimental data.According to the result of experimental data and numerical simulation for the experimental gas delimit warning zone,namely the leakage accident happens to people's health is affected space scope,and heavy gas leakage accident emergency rescue techniques provide a theoretical basis. |
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