Numerical study of periodic flame flashback in a cavity-based scramjet combustor

doi:10.1063/5.0142210

	Numerical study of periodic flame flashback in a cavity-based scramjet combustor
	Guo SZ(郭升祖); Zhang X(张旭); Liu QL(刘起立); Yue LJ(岳连捷)
发表期刊	PHYSICS OF FLUIDS
	2023-04
卷号	35 期号:4 页码:45108
ISSN	1070-6631
摘要	The periodic flame flashback phenomenon in an ethylene-fueled cavity-based scramjet combustor was numerically investigated by a three-dimensional unsteady Reynolds-averaged Navier-Stokes solver with two-step kinetics. The air inflow stagnation temperature is 1225 K, and its Mach number is 2.6. Spectral analyses revealed the combustion oscillations with flame flashbacks maintained in the separated scramjet mode with the establishment/vanishment of flow separation near the fuel injector, differing from previous studies of flame flashbacks connected to the ramjet/scramjet mode transitions. A mechanism with four evolution stages was proposed to elucidate the flow-flame interaction. In stage I, a rapid flame flashback upstream and shock-train extension were caused by the high-temperature induced auto-ignition tendency of well-mixed unburned gas in the near-sidewall low-speed region. In stage II, the combustion-induced back pressure and shock train gradually achieved an aerodynamic balance. The combustion flow barely changed in stage III. Meanwhile, a simplified model suggested that the gradual temperature rises occurring upstream of the cavity and away from the sidewall were caused by spanwise heat conduction. The higher temperatures would cause upstream flame propagation with enhanced heat release due to auto-ignition. However, the enhanced heat release occurred mostly in the subsonic flow, resulting in pressure decreases according to one-dimensional flow equations. A smaller near-sidewall separation was produced by the lower back-pressures, which prompted the rapid flame recession downstream in stage IV. Moreover, a simplified flame-spreading model was proposed to illuminate the flame propagation nature. The comparison of flame speeds with theoretical estimations indicated that the current flame was in the regime of turbulent flame propagation, rather than the C-J detonation or deflagration speculated in previous studies.
DOI	10.1063/5.0142210
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000969142200052
项目资助者	National Natural Science Foundation of China [U2141220, 11672309]
论文分区	一类/力学重要期刊
力学所作者排名	1
RpAuthor	Zhang, X ; Yue, LJ
引用统计	被引频次：8[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/92258
专题	高温气体动力学国家重点实验室
作者单位	1.(Guo Shengzu, Zhang Xu, Liu Qili, Yue Lianjie) Chinese Acad Sci Inst Mech State Key Lab High Temp Gas Dynam Beijing 100190 Peoples R China 2.(Guo Shengzu, Liu Qili, Yue Lianjie) Univ Chinese Acad Sci Sch Engn Sci Beijing 100049 Peoples R China
推荐引用方式 GB/T 7714	Guo SZ,Zhang X,Liu QL,et al. Numerical study of periodic flame flashback in a cavity-based scramjet combustor[J]. PHYSICS OF FLUIDS,2023,35,4,:45108.
APA	郭升祖,张旭,刘起立,&岳连捷.(2023).Numerical study of periodic flame flashback in a cavity-based scramjet combustor.PHYSICS OF FLUIDS,35(4),45108.
MLA	郭升祖,et al."Numerical study of periodic flame flashback in a cavity-based scramjet combustor".PHYSICS OF FLUIDS 35.4(2023):45108.

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