An experimental study of supersonic combustion of gaseous hydrogen injected trans-versely into a vitiated airstream has been carried out. The ignition and performance characteristics of the hydrogen fuelled stepped combustor have been determined. In addition to supersonic hydrogen diffusion flames, hydrogen-aided supersonic kerosene diffusion flames have also been stabilised in the stepped combustor. The flow pattern in a simulated supersonic stepped combustor has been studied. A simple one dimensional gas dynamic approach for heat addition in a sudden expansion has been used to predict the behaviour of the performance characteristics.
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