In order to understand the establishing process and formation mechanism of the rotating detonation wave,an experimental study on the rotating detonation engine with the slot-orifice impinging injection method was presented. Reactants were gaseous H2-Air mixtures and ignited for once by a low-energy ignition plug directly. The engine was initiated successfully and rotating detonation wave propagated continuously and steadily in the circumferential direction. The main frequency of the rotating detonation wave...