| Citation: | DENG Weixin, LI Ji, ZHANG Dongqing, et al. Unsteady combustion process of ethylene flame with pilot hydrogen[J]. Journal of Aerospace Power, 2023, 38（1）：79-85 doi: 10.13224/j.cnki.jasp.20210419
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Unsteady supersonic combustion process of hydrogen piloted ethylene flame in a scramjet combustor was carried out based on a direct-connected facility. The results were obtained under the inflow conditions of Mach number 2, total temperature 950 K and total pressure 1.0 MPa respectively. Ambient ethylene was used as the main fuel and ignited by pilot hydrogen. The whole experimental process could be divided into four periods: cold flow without combustion, hydrogen combustion alone, ethylene igniting by hydrogen, ethylene combustion alone. The curves of wall pressure with time and combustion development processes at five important locations in the combustor were gained through high frequency pressure transducers and flame photographs. Some insight information, including the wall pressure average value, oscillation extent and frequency, ignition time and location, were picked out. Then the unsteady combustion characteristics in different periods were analyzed and discussed. The unsteadiness came from the change of acting intensity at cavity aft-step in period of hydrogen combustion alone. The transfer between hydrogen and ethylene produced unsteady combustion in period of ethylene igniting by hydrogen. In period of ethylene combustion alone, the unsteadiness emerged from the coupling of flow and combustion.
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