Strong and Weak Ignition in 2H_2 + O_2 behind Reflected Shocks in Two-Dimensional Navier-Stokes Simulations with Detailed Chemistry

摘要

Ignition behind bifurcating reflected shocks have been examined with two-dimensional Navier-Stokes simulations including detailed chemical kinetics. Both weak and strong types of ignition have been observed by varying the incident shock Mach numbers between 2.52 and 2.60. The transition temperature for the present simulations was found to be slightly lower than previously reported experimental results. The distinction between strong and weak ignition was found to agree with the strong ignition limit criteria based on the gradient of ignition time with post-shock temperature (∂t_(ign)/∂T_5)_p identified by Meyer and Oppenheim. Near- and far-wall ignition regions identified by Yamashita et al. were also consistent with the present study.