Abstract
A series of single-shot detonation experiments was performed to understand the matching characteristics of wave and flame in DDT for H2/air mixures in a 60mm square tube that was 2m in length. The ion-probes and pressure transducers were respectively utilized to get the signal of flame and wave, and high-speed digital imaging was used to track flame propagation of DDT area. The matching rule of shock-flame was achieved by analyzing the intensity、velocity and position characteristics of wave and flame in different time along the tube. The results indicate that intensity of wave and flame is positive feedback characteristic and the velocity of wave and flame is alternant change process. The speed amplitude of flame is rapid than that of wave in deflagration phase. This result in the overdrivern detonation wave form and flame is temporarily in front of flame when flame catch up wave. Shock is in front of flame in phase which the overdrivern detonation evolve into steady detonation wave.
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