Stabilization Mechanism of Burner-attached Flames in Laminar Non-premixed Jets
文献类型：期刊论文
| 作者 | Li D(李丹)3,4; Liu Yu Cheng1,2; Wang SF(王双峰)3,4 ; Wang SF(王双峰)
|
| 刊名 | COMBUSTION SCIENCE AND TECHNOLOGY
 |
| 出版日期 | 2021-04-18 |
| 页码 | 21 |
| 关键词 | Burner-attached flame laminar non-premixed jets flame stabilization conductive heat transfer convective heat transfer |
| ISSN号 | 0010-2202 |
| DOI | 10.1080/00102202.2021.1901693 |
| 通讯作者 | Wang, Shuangfeng(sfwang@imech.ac.cn) |
| 英文摘要 | The stabilization mechanism of nozzle-attached flames in laminar non-premixed jets was studied experimentally and numerically. The local gas flow velocity and the flame propagation speed within the mixing layer at flame base were experimentally obtained before the blowout limit was reached. The experimental results show that, for burner-attached flames, the local flow velocity is much less than the burning speed, suggesting that the propagation of partially premixed flame within the mixing layer at flame base is stopped. The thickness of the fuel/air mixing layer at the attached flame base is quite narrow (1.1-1.5 mm) and less than the minimum quenching distance caused by conductive heat loss to the tube (or slit) wall in laminar premixed flame. Heat losses by the conduction from the flame base to the burner wall, and the convection between the flame base and the incoming flow (hereafter referred to as local convection) were studied through simulation. The significant roles of these effects in the stabilization of the attached flame were analyzed. While the heat loss by conduction to the fuel tube is neglected, the partially premixed flame at flame base can propagate along a much narrower mixing layer. On the contrary, a critical thickness of the mixing layer (in which the local partially premixed flame can sustain) exists near the flame base with considering the conductive heat loss. The conductive heat loss to the burner wall plays a relatively important role to flame stabilization without (or with a small amount of) coflow air. As the velocity of coflow air increases, the heat loss due to local convection gradually exhibits significant effects on flame stabilization. In addition, a simple theoretical model is provided based on the balance between the heat released by chemical reaction and the heat lost by conduction and local convection, suggesting clear dependence of the thickness of the fuel/air mixing layer on the local gas flow velocity and the laminar flame speed. The stability behaviors of flame base can be reasonably explained and predicted through such relation. |
| 分类号 | Q3 |
| 资助项目 | Strategic Pioneer Program on Space Science, Chinese Academy of Sciences[XDA15012800] |
| WOS研究方向 | Thermodynamics ; Energy & Fuels ; Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:000641380400001 |
| 资助机构 | Strategic Pioneer Program on Space Science, Chinese Academy of Sciences |
| 其他责任者 | Wang, Shuangfeng |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/86470]  |
| 专题 | 力学研究所_国家微重力实验室 |
| 作者单位 | 1.Tsinghua Univ, Dept Energy & Power Engn, Beijing, Peoples R China 2.Tsinghua Univ, Ctr Combust Energy, Beijing, Peoples R China; 3.Univ Chinese Acad Sci, School Engn Sci, Beijing, Peoples R China; 4.Chinese Acad Sci, Inst Mech, Key Lab Micrograv, Beijing, Peoples R China; |
| 推荐引用方式 GB/T 7714 | Li D,Liu Yu Cheng,Wang SF,et al. Stabilization Mechanism of Burner-attached Flames in Laminar Non-premixed Jets[J]. COMBUSTION SCIENCE AND TECHNOLOGY,2021:21. |
| APA | 李丹,Liu Yu Cheng,王双峰,&Wang SF.(2021).Stabilization Mechanism of Burner-attached Flames in Laminar Non-premixed Jets.COMBUSTION SCIENCE AND TECHNOLOGY,21. |
| MLA | 李丹,et al."Stabilization Mechanism of Burner-attached Flames in Laminar Non-premixed Jets".COMBUSTION SCIENCE AND TECHNOLOGY (2021):21. |
入库方式： OAI收割
来源：力学研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。