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Rotating detonation engines (RDE) have recently garnered much interest due to simplicity and high thermodynamic efficiency over traditional Brayton cycle engines. This study is motivated by the desire to better understand the RDE-relevant flow structure and the limiting physics associated with detonation waves in cross-flow by incorporating a row of linear injectors, similar to an unwrapped RDE channel configuration. A blast wave exiting from a detonation tube was directed to a row of starting jets containing stoichiometric hydrogen-oxygen mixtures that were diluted with helium. The wave arrival timing was controlled to produce designed cross-flow jet heights between 5 and 29 times the detonation cell width of the reactants, and the resulting interaction between the blast wave and the cross-flow jets was studied using schlieren flow visualization and pressure disturbance measurements in an unconfined environment. This paper presents the results of preliminary investigation including several inert and detonable mixture cross-flow cases. Under certain conditions, the cross-flow jets were ignited by the blast wave driving the wave front further forward, similar to a detonation wave. The results shed more light on the critical jet height for maintaining detonation wave in cross-flow. The cross-flow jet heights on the order of 10 detonation cell width were required for re-energizing the blast wave front.

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