| On the transition modes and mechanisms for laminar to turbulent lifted jet diffusion flames at normal- and micro-gravity | |
Li D(李丹); Wen, Yuzhe; Liu, Yu Cheng; Wang SF(王双峰)
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| Corresponding Author | Wang, Shuangfeng([email protected]) |
| Source Publication | COMBUSTION AND FLAME
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| 2024-02-01 | |
| Volume | 260Pages:10 |
| ISSN | 0010-2180 |
| Abstract | Experiments of laminar-to-turbulent jet diffusion flames were conducted in microgravity (mu g) and normal gravity (ng) to investigate effects of liftoff and buoyancy on the flame transition. Characteristics of flame shape and flame stability during the transitional process as well as the transition mechanism were examined. Theoretical analyses were conducted by considering influences of buoyant flow on flame shape. Results show that for a lifted flame the transition from laminar to turbulent is mainly caused by incipient turbulent flow near the flame base, and the flow turbulence arises from fuel jet breakup developed upstream of the flame. Buoyancy has little effects on the flame transition mechanism. It was found therefore that the ranges of jet Reynolds number corresponding to the transitional stage in ng and mu g are nearly the same (1720 +/- 2650). During the transitional process, the flame heights in mu g were approximately doubled comparing to that in ng, and the flame liftoff heights in mu g were persistently smaller than that in ng. Besides, the transitional flames in mu g appeared to increase soot intensity comparing to those in ng. In the absence of buoyancy intrusion, limits of liftoff and blowout were both extended. In addition, a 2/3 power law correlation between the non-dimensional flame height and the flame Froude number was derived with certain theoretical basis. It was found to agree well with the experimental data for transitional and turbulent lifted flames. |
| Keyword | Lifted flame Non-premixed jet Transition to turbulence Flame stability Microgravity |
| DOI | 10.1016/j.combustflame.2023.113269 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:001146689000001 |
| WOS Keyword | STABILIZATION MECHANISM ; OFF HEIGHTS ; COFLOW ; INSTABILITY ; BLOWOUT ; GRAVITY ; LIFTOFF ; EDGE |
| WOS Research Area | Thermodynamics ; Energy & Fuels ; Engineering |
| WOS Subject | Thermodynamics ; Energy & Fuels ; Engineering, Multidisciplinary ; Engineering, Chemical ; Engineering, Mechanical |
| Funding Project | National Key Research and Development Program of China[2021YFA0716202] ; National Key Research and Development Program of China[2022YFF0504500] |
| Funding Organization | National Key Research and Development Program of China |
| Classification | 一类/力学重要期刊 |
| Ranking | 1 |
| Contributor | Wang, Shuangfeng |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/94217 |
| Collection | 微重力重点实验室 |
| Recommended Citation GB/T 7714 | Li D,Wen, Yuzhe,Liu, Yu Cheng,et al. On the transition modes and mechanisms for laminar to turbulent lifted jet diffusion flames at normal- and micro-gravity[J]. COMBUSTION AND FLAME,2024,260:10.Rp_Au:Wang, Shuangfeng |
| APA | 李丹,Wen, Yuzhe,Liu, Yu Cheng,&王双峰.(2024).On the transition modes and mechanisms for laminar to turbulent lifted jet diffusion flames at normal- and micro-gravity.COMBUSTION AND FLAME,260,10. |
| MLA | 李丹,et al."On the transition modes and mechanisms for laminar to turbulent lifted jet diffusion flames at normal- and micro-gravity".COMBUSTION AND FLAME 260(2024):10. |
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