On transition of type V interaction in double-wedge flow with non-equilibrium effects

•Transition of regular reflection (RR)-Mach reflection (MR) in type V shock interaction in double-wedge flow is studied considering the thermochemical non-equilibrium effects.•Transition mechanism between RR and MR of type V interaction is changed by the non-equilibrium effects.•Non-equilibrium effects lead to a lager critical wedge angle and a larger hysteresis interval.

The transition between regular reflection (RR) and Mach reflection (MR) of type V shock-shock interaction on a double-wedge geometry with high temperature non-equilibrium effects is investigated by extended shock-polar method and numerical simulation. First, the critical angles of transition from detachment criterion and von Neumann criterion are determined by the extended shock-polar method considering the non-equilibrium effects. Then wave patterns and the transition process are numerically obtained. Results of the critical transition angles from shock-polar calculation and numerical simulation show evident disagreement, indicating transition mechanism between RR and MR of type V interaction is changed. By comparing with the frozen counterpart, it is also found that non-equilibrium effects lead to a larger critical wedge angle and a larger hysteresis interval.