Explosion characteristics of discontinuous distribution methane/air in closed pipe
In this paper,the effect of discontinuous distribution of premixed gas on methane/air explosion was studied experimen-tally in a rectangular closed pipe with a length of 900 mm and a section of 100 mm×100 mm.Segmentally introduce methane/air with a volume fraction of 9.5%into the pipe to form two types of discontinuous distribution premixed gases:methane/air-air and methane/air-air-methane/air.The results show that the flame propagation distance,flame tip speed and explosion overpressure increase with the shortening of the air area.Especially in the form of methane/air-air-methane/air distribution,when the intermedi-ate air area is less than 500 mm,the flame will pass through and cause a secondary explosion,and its overpressure will increase with the decrease of the air area.The research results can provide theoretical support for the prevention and control of natural gas ex-plosion accidents.
discontinuous distributionmethane/airflame behav-iorflame tip speedexplosive overpressure
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