Abstract
Theme I N this paper, an investigation of the two-dimensional supersonic jet interaction flowfield with and without chemical heat release is presented, and the spontaneous ignition limits of the bulk flame produced far downstream are determined. Highly underexpanded hydrogen and nitrogen jets are injected from a converging slot nozzle perpendicular to the supersonic vitiated air stream, at various airstream and injectant conditions. The parameters varied during the experiments include the airstream stagnation temperature and oxygen concentration, and the injection pressure. The temperature profiles and the Schlieren photographs of the resulting flowfield with chemical heat release are compared with those of nonreacting case. From these results, the ignition mechanism of supersonic diffusion flame and the extent to which chemical heat release changes the jet interaction flowfield are discussed.
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