Interaction between Combustion and Shock Waves

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Abstract
The pressure variations and the ionization of the gas behind a flame front propagating in a stoichionietric propane-air mixture through a plexiglass tube were measured by a piezoelectric pressure transducer and double-probe method, when shock waves produced by means of a shock tube propagated in the same plexiglass tube and collided with the flame. A remarkably high pressure increase and stimulation of ionization behind the flame front under the interaction with the shock waves were observed, and it was found that their values depended on the strength of the incident shock and the position of the shock front in relation to the flame front. These results are attributed to some exothermic reactions which follow the main normal combustion and produce detonation waves in the flame.

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