Confined Space Gas Leak Numerical Simulation Of Diffusion And Explosive

Natural gas is a kind of clean energy. under the industrial policy suppor of "two-pronged" for gas and oil, natural gas will be more and more important in our country's Energy structure. However, Natural gas has inflammable, explosive, toxic and other dangerous characteristics almost simultaneously. City gas pipeline as the conveying medium are the key link of the safe using natural gas. As a result, it has double important meaning of theory and practice for the urban security to study the gas accident release of transport and diffusion process, to make clear gas leak diffusion, to summarize the gas leak after the explosion hazards consequences.The dissertation are based on the composition of research achievements at home and abroad. Firstly, the high speed leakage diffusion of natural gas in limited space were simulated by the FLUENT software, by which the study and theoretical explanation were made at the vicinity of leak mounth as well as the concentration distribution. And then on, the further study for the influence by the factors such as ventilated condition, obstacles and leakage rate etc. was made on the concentration in field inlimited space. The regular pattern of natural gas leak diffusion was found under the the influence of different factors mentiond before. Secondly, the numerical simulation on natural gas explosion was made by using AUTOREAGAS software. The discussion on natural gas explosion by the factors such as constraint content, obstacles, gas concentration in limited internal space factors and so on. Finally, by integrated using of the FLUENT and AUTOREAGAS software, the numerically simulation on gas leakage and explosion of a middle level voltage natural gas supply state was made. The simulation showed that the integrated using of the FLUENT and AUTOREAGAS software on the numerical simulation is not only more tally with the actual situation, but also has stronger significancefor gas explosion accident in prevention and research the natural gas.This dissertation mainly make limited space gas pipeline leak as the research object. The purpose is to get gas in limited space within the leakage diffusion regularity and explosion hazards consequences. This article use the method of numerical simulation and CFD software for natural gas, diffusion and explosion quantitatively study. With the studying, can for safety evaluation and management, accident warning, accident analysis to provide important basis...