Guillaume Pelletier, Marc Ferrier, Axel Vincent-Randonnier, Arnaud Mura

DOI Number XXX-YYY-ZZZ

Conference Number HiSST-2020-0228

Reactive Delayed Detached Eddy Simulations (DDES) of hydrogen injected into a transverse supersonic flow of vitiated air are conducted in a confined environment. The corresponding experimental conditions are studied in the LAPCAT-II combustor operated in the LAERTE facility of ONERA Palaiseau Research Center. Due to thermal coating, the wall surfaces of this combustor feature a significant wall roughness, the mean characteristic height of which is 65 μm. The effects of this wall roughness on the turbulent reactive flow development is taken into account within the sand-grain modeling framework. Experimental results exhibit two distinct combustion modes depending on the global feeding equivalence ratio: one is characteristic of supersonic combustion and the other one is characteristic of partially ther- mally choked flow. Numerical simulations can reproduce these behaviors provided that wall roughness is taken into account.

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In Categories: HiSST 2022, Propulsion Systems and Components
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