Basic Mechanisms of Combustion Instability and Shock Initiated Supersonic Combustion.
Final scientific rept.,
MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF MECHANICAL ENGINEERING
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This report presents results of two studies, both aimed at understanding coupling mechanisms in combustion instability. Two such mechanisms are discussed, including experimental verification of essential features involved. In one case, both theory and experiment demonstrate that strong interactions between acoustic and flame oscillations can exist through flow oscillations and that these interactions are due to energy transport between various oscillation modes through linear and nonlinear couplings. In another case, instability is triggered by disturbances occurring in an induction zone as a consequence of sensitivity of induction time to temperature changes. Such instability is observed in exothermic hypersonic blunt-body flows, as manifested by the presence of two distinct unsteady flow fields one with highly regular periodic oscillations and the other with rather large-scale turbulent structure.
- Fluid Mechanics
- Combustion and Ignition