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Triggering of Detonation upon Flame Interaction with an Expansion Wave
Authors:V A Subbotin
Affiliation:(1) Siberian Division, Russian Academy of Sciences, Lavrent'ev Institute of Hydrodynamics, Novosibirsk, 630090
Abstract:The transition of a deflagration wave into an abruptly expanding part of a plane channel, where a quasidashsteady supersonic underexpanded jet of an unburned gas is formed, is studied for a propane–oxygen mixture using schlieren pictures. Two explosiondashinitiation modes (weak and strong) are registered. In the first case, almost instantaneous onset of the detonation wave occurs when the flame front enters the expanding section; the initial velocity of this wave is approximately 1.5 times the Chapman–Jouguet detonation velocity (DCJ) and then decreases to a value corresponding to selfdashsustaining detonation. In the second case, the front velocity gradually increases from ap 0.4D CJ to ap 1.0D CJ. It is established that the starting pulse triggering the transformation of turbulent combustion to explosion and detonation regimes is generated by interaction of the flame front with expansion waves, which are elements of the structure of the initial section of the jet.
Keywords:explosion  detonation  combustion  supersonic flow  mixing  combustion products  initial mixture
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