Steel tanks are widely used for the storage of liquefied natural gas, petroleum and other flammable explosive substance. The detonation of these explosives generates high intensity shock wave within a short time, which will cause serious damage to storage tanks and bring catastrophic results. A rational evaluation of the explosion loading is the foundation for structure failure analysis and safety designing of tanks. CFD model is built up based on turbulence model and EDC combustion model by the use of computational fluid dynamics software Fluent, which can simulate the changes of explosion flow field in tanks and obtain the overpressure time history of typical position unites. Compared with TNT equivalent method, the result of CFD model is closer to the actual situation of flammable gas explosion in tanks. Furthermore, influences of height-to-diameter ratio, concentration and species of flammable gas and initial pressure are taking into account. It is shown that, the gas reaction rate and explosion loading enhance along with the increase of height-to-diameter ratio, initial pressure and activity of flammable gas. Moreover, a stoichiometric concentration also will cause a higher explosion pressure and gas reaction rate.
Key words
steel tanks /
flammable gas /
explosion loading /
overpressure /
CFD
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