A Computational Study of the External Shock-Wave Impact on the Combustion Regime

Abstract

A problem concerning shock-flame interaction within a semiopened channel filled with premixed hydrogen-oxygen or hydrogen-air gas mixtures is solved numerically. Such an interaction induces combustion regime changing. A classification of probable new regimes is obtained by the example of two mixtures. The basic scenario of regime changing is local energy release intensification. Maximum pressures generated while slow combustion transits to a faster energy release regime and then to overdriven detonation depend on the transient process generation conditions. The generated pressures considerably exceed the pressures in the initial incident shock. The case of transition to overdriven detonation taking place as a result of the initially accelerated flame interaction with the shock reflected from channel closed-end wall appear to be the most interesting. Maximum pressures in this case can achieve hundreds of that in the initial incident shock.

Keywords:

• Deflagration-to-detonation transition
• Numerical simulation
• Shock-flame interaction