Scholarly record
VIRTUAL SIMULATION OF INITIATING EXPLOSIVE ATMOSPHERES DUE TO METHANE LEAKS
Abstract
Most of the time, in assessing a situation where a leakage of combustible gas is involved, the volume of the room where the release occurs and the volume of the released gas is taken into account, thus resulting in an average concentration of the fuel gas applied to the entire volume of the room. In some cases, when the source of combustible gas is close enough to the source of initiation, or when air currents converge at the location of the source of initiation carrying amounts of combustible gas, the explosive mixture formed in the vicinity of the source of ignition may be initiated even if the minimum explosive concentration in the entire volume is not reached / exceeded. This paper explores the release of methane gas inside a closed space and the initiation of the mixture at different concentrations reached at the spark location. The experiments are virtually performed through CFD techniques. Computational modeling of gas explosion phenomena in closed-space involves simulating the movement of some areas in response to event-generated pressures, the deformation by translation and/or rotation of these areas, or even the transformation of their boundary conditions from walls into open frontiers to release explosion pressures. A very important aspect regarding computational modeling is the source of initiation of the methane air mixture. As a result of virtual tests, some differences were observed between the simulation results and the calculation currently used for the determination of methane concentrations in enclosed spaces in case of accidental leakages of combustible gases.
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References5
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