Seung-Min JEONG, Jae-Eun KIM, Mun-Soo KIM, Jeong-Yeol CHOI

DOI Number: 10.60853/69e7-0273

Conference number: HiSST-2024-0081

This study numerically investigates the combustion characteristics of a hydrogen-fueled scramjet combustor by incoming vitiation air effects. A high-resolution comprehensive numerical simulation was conducted with hybrid LES/RANS and high-order schemes. Two different global equivalence ratios, 0.23 and 0.45, were applied on each incoming air condition, clean air and vitiation air, to investigate the effects of equivalence ratio changing. The results show that shock trains accompanied by a thermal
chocked formed around the cavity close-out region when the incoming flow condition changes from vitiated air to clean air condition. The change in combustion characteristics depending on the incoming air was found to be more severe as the equivalence ratio increased. Present results indicate that when the ground experimental test with the vitiated air heater to derive the design point of a scramjet combustor or engine, results must be calibrated considering the discrepancies between the combustion characteristics of the clean and vitiated air.

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In Categories: 1.Events, High-Speed Aerodynamics and Aerothermodynamics, HiSST 2024
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