| Citation: | HE Zan, LE Jialing, TIAN Ye, et al. Experiment on variation of combustion reaction region in a scramjet combustor[J]. Journal of Aerospace Power, 2023, 38（10）：2370-2382 doi: 10.13224/j.cnki.jasp.20210664
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The combustion process of gaseous fuel in a direct-connected cavity combustor was studied by experimental method under the condition of incoming Mach number 2.5; combined with wall pressure measurement and OH-PLIF (OH-planer laser-induced fluorescence) method, the development process of combustion reaction zone of ethylene fuel in 1 ms after ignition and the change process of combustion reaction zone of hydrogen fuel in 1 ms during flame stabilization were analyzed. The results showed that the slope of the trailing edge of the cavity played an important role in the flame propagation of gaseous fuel, and the initial combustion zone slowed down and stood still after arriving at the slope with the incoming flow, providing a suitable ignition environment for the nearby fuel. The cavity shear layer played an important role in the stable flame combustion of gaseous fuel, and there exists always a severe combustion reaction area in the shear layer, providing continuous ignition energy for the cavity and energy support for maintaining the continuous ignition and combustion of the fuel in the cavity. The development rate of the initial combustion reaction region of ethylene to the upstream cavity was about 170 m/s.
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