Abstract
Abstract Results are presented of a study in which schlieren photographs of the flame in a special visualization spark ignition engine were taken, with first propane and then hydrogen as fuel, under conditions where the flow field, total energy released and geometric constraints were closely comparable. It is shown that the rate of development of the flame from its inception is much faster for hydrogen, that the cycle-to-cycle variations for hydrogen are substantially less, and that the thickness of the hydrogen turbulent flame is about one-third to one-quarter that of propane. Application of a wrinkled laminar flame model to these results shows that the characteristic burning time of the hydrogen flame is one-sixth that for propane, and that the characteristic scale of the wrinkling for hydrogen is 0.6 that for propane. Both the appearance of the two flames, and their turbulent flame speeds in relation to their laminar flame speeds, indicate that the two flames fall in different turbulent flame regimes (Ballal and Lefebvre, 1975).
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