The shock wave overpressure evolution and flame propagation characteristics of gas explosion of utility tunnel
In order to explore the evolution of overpressure and flame propagation characteristics after gas explosion in the gas chamber of a utility tunnel,a gas explosion pipeline experimental system was constructed in the laboratory.The system had a length of 20 m and a cross-section of 180 mm × 180 mm.The experimental study focused on the propagation characteristics of the shock wave generated by methane with a volume fraction of 9.5％.The temporal and spatial evolution characteristics of the explosion overpressure and flame with different gas accumulation lengths were analyzed.The research results showed that as the gas accumulation length increased,the peak overpressure of the explosion showed an initial increase followed by a decreasing trend with the propagation distance of the shock wave.The maximum overpressure peak value in the explosion process is proportional to the length of gas accumulation.As the gas accumulation length increased,the flame spread over a wider range,and the flame propagation velocity showed an initial increase followed by a decrease.The flame propagation speed is up to 350.32 m/s,and the flame duration decreases first and then increases gradually under different gas accumulation lengths.These research results can provide scientific basis for the safety design and protective measures of integrated pipe galleries.Additionally,they can also serve as references for emergency.
gas explosionutility tunnelpropagation characteristicsexplosion overpressure
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维普
