燃烧室
超燃冲压发动机
冲压发动机
超音速
材料科学
机械
燃烧
马赫数
点火系统
空腔壁
航空航天工程
物理
化学
工程类
复合材料
有机化学
作者
Jianheng Ji,Zun Cai,Taiyu Wang,Zhenguo Wang,Mingbo Sun
出处
期刊:AIAA Journal
[American Institute of Aeronautics and Astronautics]
日期:2023-12-20
卷期号:62 (3): 915-927
被引量:1
摘要
This study conducted experiments to investigate flame behaviors in a cavity-based scramjet combustor operating under Mach 2.92 supersonic inflow. Pressure measurements and flame chemiluminescence observations were combined to study the initial flame formation and combustion mode transitions. In addition, flame luminosity standard deviation and fast Fourier transform power spectral density (PSD) were post-processed to assess the impact of equivalence ratio and aft wall height on combustion modes as well as oscillations. It is indicated that increasing the equivalence ratio leads to a transition from lifted shear-layer mode to ramjet mode. Elevating the cavity aft wall height improves the combustor’s self-ignition capability and promotes the transition from lifted shear-layer mode to ramjet mode as long as flame stabilization is achieved. It is found that increasing the equivalence ratio and aft wall height also results in more intense combustion oscillations; besides, raising the cavity aft wall height could accentuate the predominant frequency of low-frequency oscillations in the combustor. Finally, it is demonstrated that the application of spark plasma effectively suppresses these low-frequency combustion oscillations, which is a promising active control method in the scramjet engine.
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