Influence of Vent Burst Pressure on Propagation of Gas Explosion in Underground Utility Tunnel
The underground utility has been widely used.Explosions of leaked gas can cause serious damage to the underground utility.Utilizing the potential explosion venting system inside the gas cabin can reduce the harm caused by explosion shock.But there is currently a lack of quantitative research in this area.A three-dimensional numerical model established by Fluent software was applied for simulating the process of explosion propagation in a gas chamber.The variation patterns of flame propagation,explosion overpressure,and explosion overtemperature were investigated under different vent burst pressures.The results indicate that as vent burst pressure increases,the maximum flame propagation velocity,explosion overpressure,and initial temperature gradually increase within the chamber,and in contrast,the duration of flame inside the gas chamber and the flame velocity at venting port decrease.When vent burst pressure is less than 60 kPa,the maximum overpressure in the chamber is generated by the release of burning mixture.When it exceeds 60 kPa,gas from external explosion is insufficient to hinder the release of burning gas inside,and the maximum explosion overpressure in the chamber is caused by the secondary explosion.Explosion venting can delay and reduce the occurrence of the first explosion overtemperature peak,and a larger vent burst pressure is more conducive to monitoring temperature changes at each measuring point.The results can provide a reference for the study of gas explosion propagation within an underground utility tunnel,as well as for the design of an escape opening within the chamber.
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维普
