The prompt ODWs induced by finite-length wedges are investigated by numerical simulations. The numerical results show that premature ignition resulting from the initial conditions can result in the formation of the prompt ODWs that cannot take place spontaneously over the wedge. The fully coupled and the partially coupled prompt ODWs are observed in the flow field. The UF TWs of the fully coupled prompt ODW slide downstream, and consequently the detonation can be sustained. For the partially coupled prompt ODW, the UF TWs propagate upstream, and the DF TWs become too weak to ignite the shocked detonable mixtures under the weakening effect of the EWs. Moreover, the height of the detonation wave increases with the wedge length. The partially coupled prompt ODW is unstable and destabilized occasionally by the local explosion resulting from the instability of the combustion wave. The destabilized ODW will restabilize to a partially coupled ODW.
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