自然科学版 英文版
自然科学版 英文版
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中南大学学报(英文版)

Journal of Central South University

Vol. 27    No. 6    June 2020

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A non-monotonic blow-off limit of micro-jet methane diffusion flame at different tube-wall thicknesses
LI Dan(李丹)1, LIU Bing(刘冰)1, HUANG Long(黄龙)1, LIU Lei(刘磊)1, KE Wei-chang(柯炜昌)1, WAN Jian-long(万建龙)2, LIU Hao(刘豪)2

1. China Tobacco Hubei Industrial Limited Liability Company, Wuhan 430040, China;
2. State Key Laboratory of Coal Combustion, School of Energy and Power Engineering,
Huazhong University of Science and Technology, Wuhan 430074, China

Abstract:In order to provide guideline for choosing a suitable tube-wall thickness (d) for the micro-jet methane diffusion flame, the effect of tube-wall thickness on the blow-off limit is investigated via numerical simulation in the present work. The results show that the blow-off limit of micro-jet methane diffusion flame firstly increases and then decreases with the increase of tube-wall thickness. Subsequently, the underlying mechanisms responsible for the above non-monotonic blow-off limit are discussed in terms of the flow filed, strain effect and conjugate heat exchange. The analysis indicates that the flow field is insignificant for the non-monotonic blow-off limit. A smaller strain effect can induce the increase of the blow-off limit from d=0.1 to 0.2 mm, and a worse heat recirculation effect can induce the decrease of the blow-off limit from d=0.2 to 0.4 mm. The non-monotonic blow-off limit is mainly determined by the heat loss of flame to the tube-wall and the performance of tube-wall on preheating unburned fuel. The smallest heat loss of flame to the tube-wall and the best performance of tube-wall on preheating unburned fuel result in the largest blow-off limit at d=0.2 mm. Therefore, a moderate tube-wall thickness is more suitable to manufacture the micro-jet burner.

 

Key words: micro-jet diffusion flame; blow-off limit; flow field; strain effect; conjugate heat exchange

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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