Effects of buoyancy on open turbulent lean premixed methane-air V-flames

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	Effects of buoyancy on open turbulent lean premixed methane-air V-flames
	Wang, Y; Konig, J; Eigenbrod, C
刊名	MICROGRAVITY SCIENCE AND TECHNOLOGY
	2003
卷号	14 期号:3 页码:25-37
英文摘要	The behavior of lean premixed methane-air open V-flames of wrinkled flame fronts was studied both numerically and experimentally. In the numerical simulation, the mean flow fields of the flames were investigated when gravity was switched on and off to see the buoyancy influence on velocity and flame stretch. The results show that buoyancy accelerates the upward motion of the hot product plumes and hence changes the flow field. However the changes are mainly concentrated in the far field area and not apparent in the area near flame brushes. The mean stretch of the flame brushes does change under the influence of gravity, but it seems that this does not influence the flame brushes strongly since the stretch rate is rather low. The experiments were done in the Bremen drop tower and the flame wrinkles were observed under both 1g(0) and mug by using OH-PLIF It can be clearly seen that the flame wrinkles were augmented under mug especially in the cases of weak turbulence. Thickness of the flame brushes was calculated according to the iso-lines of mean progress variable (c) over bar in order to see the buoyancy influence on the flame wrinkles. It was found that the impact of buoyancy is inversely related to the intensity of turbulence. The two possible mechanisms of the buoyancy influence on flame wrinkles, baroclinic mechanism and the impact of mean stretch, are discussed according to the numerical and experimental results. It seems that baroclinic mechanism is the controlling factor.
WOS标题词	Science & Technology ; Technology ; Physical Sciences
类目[WOS]	Engineering, Aerospace ; Thermodynamics ; Mechanics
研究领域[WOS]	Engineering ; Thermodynamics ; Mechanics
关键词[WOS]	STABILIZATION ; GRAVITY ; LAMINAR
收录类别	SCI
语种	英语
WOS记录号	WOS:000186913100005
公开日期	2015-12-22
内容类型	期刊论文
源URL	[http://ir.etp.ac.cn/handle/311046/106180]
专题	工程热物理研究所_中国科学院工程热物理所（论文库）_期刊论文（SCI）
作者单位	Chinese Acad Sci, Inst Engn Thermophys, Beijing 100080, Peoples R China
推荐引用方式 GB/T 7714	Wang, Y,Konig, J,Eigenbrod, C. Effects of buoyancy on open turbulent lean premixed methane-air V-flames[J]. MICROGRAVITY SCIENCE AND TECHNOLOGY,2003,14(3):25-37.
APA	Wang, Y,Konig, J,&Eigenbrod, C.(2003).Effects of buoyancy on open turbulent lean premixed methane-air V-flames.MICROGRAVITY SCIENCE AND TECHNOLOGY,14(3),25-37.
MLA	Wang, Y,et al."Effects of buoyancy on open turbulent lean premixed methane-air V-flames".MICROGRAVITY SCIENCE AND TECHNOLOGY 14.3(2003):25-37.