Fig. 4 Four schlieren images from four separate experiments overlaid with the location of the gravity current at the instant of detonation initiation. Ethylene-oxygen (Φ=2.5) is the combustible mixture with pure nitrogen as the test gas. The delay times are 0 s (a), 1 s (b), 2 s (c), and 3 s (d). The vertical height yo is used to estimate the composition profile.
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