Abstract

A premixed supply of fuel and oxidizer was successfully fed through five concentric feed slots and detonated in a rotating detonation engine (RDE). This study reports the first known successful air-breathing premixed RDE. The premixed flow maintained a boundary layer velocity gradient that successfully arrested flashback. An operating map was constructed and compared to a non-premixed RDE. Mixing effects were shown to be important through measured wave speeds that were slower than theoretical Chapman-Jouguet detonation velocities, CFD results, and similar non-premixed RDE. High speed imagery indicated that the wave speed measurements should account for the circumferential velocity of expanding gases and the Chapman-Jouguet calculation should account for partial mixing with combustion products.

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