The goal of this study was to determine the stability of the ame in a recirculation region formed in a wall cavity with ignition provided by hydrogen injected in the base of the cavity and injection of kerosene upstream in the boundary layer formed along the wall leading to the cavity. The experimental conditions, i.e., Mach 1.8 and air stagnation temperatures to 1000 K, correspond to the beginning of the hypersonic ight regime also referred to as cold start conditions. The hydrogen and the preinjected kerosene ow rates were modulated during the tests and temperature probes placed in the cavity indicated their effect on the local equivalence ratio. Preinjection of kerosene reduced the local equivalence ratio at low air stagnation temperature by increasing the entrainment of fresh air into the recirculation region. At high temperatures the additional fuel brought by the presence of kerosene had a detrimental effect on the stability of the ame in the cavity.
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Owens et al. (1998) studied this question.