Study on the applicability of mixture gas in flame suppression test of aircraft flame arrestor
The flame propagation characteristics of flame arrestor for typical civil aircraft fuel tank vent were studied.According to the combustion and explosion scheme of mixture gas of H2,O2 and Ar stipulated in SAE ARP5416,and referring to the test method under ISO 16852 standard,the com-bustion and explosion test platform was built,and a series of tests were carried out under the condi-tions of different H2 concentration ratios,internal apertures and lengths of flame suppression core.The characteristics of the flame arrestor were compared with those of current commercial flame arrestor.The phenomenon and law of deflagration flame arrestor were also obtained by using high-speed camera and the simulation was carried out.The results show that the flame propagation test of aircraft flame arrestor using H2 with a concentration ratio of 5.0％-10.0％has a very low success rate of flame sup-pression,and the influence rule of increasing H2 concentration on the flame propagation velocity is ob-tained.The results show that the difference between H2 and aviation kerosene vapor is the key factor in the failure of flame suppression.The limitations of mixture gas in this test were explained.The test re-sults can provide reference for the research on H2-type flame arrestor.
aircraft flame arrestormixture gascombustion and explosion processflame suppression testgas applicability
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