Abstract
In this study, the effects of vent size on the internal overpressure and flame behavior within and outside a 1 m3 cuboid test chamber with 30 vol% hydrogen–air mixtures were investigated. Different pressure peaks and the corresponding mechanisms were presented. Two regions of pressure oscillation were found in the pressure–time histories. The oscillation frequency of one region was independent of the nondimensional vent coefficient– KV, and that of the other increased considerably with KV. The maximum overpressures increased slightly when the vent sizes were large (KV ≤ 12.50) and increased significantly as the vent sizes were decreased (KV > 12.50). Two empirical correlations—Molkov’s best-fit model and a modified version of NFPA 68 (2013) by Fakandu et al.— relating the vent sizes to overpressure were found to be appropriate for the present study. A Mach disk was identified for the smallest vent size (KV = 25.00) in the external flame, and a constant-pressure jet flame was observed.
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