Abstract
An experimental investigationwas conducted to study the amepropagationprocesses of premixedhydrogen/air ames in a test rig simulating conditions in heated-gas in ators for the advancement of the hybrid airbag device. Themajorobjectivewas to observe the couplingphenomenaof the igniter discharge and amepropagationprocess under different test conditions.Using high-speed cinematography, the ame-front propagationspeed was found to be governed by the trajectory of the ejected igniter disk. Initial concentration of hydrogenhas a dominanteffect on the pressure–time history in the combustor. It was found that, for marginally lean mixtures, the occurrence of the nonreproducible feature of the second pressure hump, during the chamber depressurization process, was caused by the strong coupling between the igniter disk trajectory and the wake- ow induced reactions of entrained gases.
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