Numerical simulation of gaseous detonation reflection over wedges
爆轰波在楔面上反射数值分析

In this paper, the chemically reacting flow-field of detonation reflection over wedges was simulated numerically. The dispersion-controlled dissipative scheme (DCD) was adopted to solve two-dimensional Euler equations implemented with detailed chemical reaction kinetics of hydrogen-oxygen-argon mixture. The fractional step method was applied to treat the stiff problem arising from computation of chemical reaction flow. The wedge angle, initial pressure and composition of the mixture were taken into consideration respectively to evaluate their effect on the angle $\chi$ of triple-point trajectory of detonation reflection over wedges. From the numerical results it is observed that the critical wedge angle $\alpha_{\rm crit}$ for the transition from Mach reflection to regular reflection of detonation wave is close to the experimental data or CCW theoretical result. The numerical results also show that the angle $\chi$ of triple-point trajectory is mainly depend on wedge angle $\alpha$ and is not sensitive to variation of the initial pressure $P_{0}$.