The interaction mechanism of oblique detonation wave (ODW) with centered Prandtl–Meyer expansion wave around the corner of a wedge is numerically studied. The governing equations are two-dimensional conservative Euler equations with a one-step global detonation model. The convective flux analysis methodology is used to analyze the movement of transverse waves. The numerical results show that the ODW is composed of either downstream-propagating transverse waves (DTWs) under lower activation energy or upstream-propagating transverse waves (UTWs) under higher activation energy. The interaction mechanism of expansion wave with these two kinds of transverse waves becomes complex. The interaction of expansion wave with DTWs cannot make the ODW decoupled directly because it cannot prevent the generation of new transverse waves. In contrast, UTWs are generated downstream via autoignition. The expansion wave can inhibit the generation of new transverse waves by extending the ignition delay time. Accordingly, the ODW is decoupled and quenched under the influence of expansion wave.
Yunfeng Liu (Wed,) studied this question.