Linear stability analysis of a premixed flame in curved micro-combustors
文献类型：期刊论文
| 作者 | Chen, Lu1,3; Lv Y(吕钰)2,3 |
| 刊名 | PHYSICS OF FLUIDS
 |
| 出版日期 | 2025-08-01 |
| 卷号 | 37期号:8页码:12 |
| ISSN号 | 1070-6631 |
| DOI | 10.1063/5.0278544 |
| 通讯作者 | Lv, Yu(lvyu@imech.ac.cn) |
| 英文摘要 | A micro-combustor is an attractive concept to enable a high-energy-density power supply for microelectromechanical applications. This work concerns the combustion instability in micro-combustors with curved geometries. We calculate the base-flame solutions and present a systematic linear stability analysis of anchored premixed flames suited in curvatured-affected flow fields with the focus on the so-called intrinsic thermoacoustic (ITA) modes. By varying the ratio of channel radius of curvature to channel height, R-c/H, the global eigen spectrum shows that the first ITA mode tends to destabilize with the growth of R-c/H and then stabilize at a very strong curvature where a significant flame bending is present. A flame-transfer function based on streamwise velocity perturbations confirms that the classical -pi phase-lag criterion remains valid even under strong curvature. To pinpoint the regions most responsible for mode growth or decay, we perform an adjoint-based structural sensitivity analysis. The resulting wavemaker maps reveal two key loci: one enveloping the flame front and another upstream in the inflow region, highlighting the critical role of convective velocity disturbances in ITA formation. Unlike straight channels, curved geometries support multiple ITA branches, each exhibiting dominant sensitivity to inlet perturbations. Our findings not only elucidate the physical origins of curved-channel ITA instabilities but also verify a rapid criterion-based prediction in non-planar ducts. The identified "safe" curvature intervals offer practical guidance for the geometry of micro-thermophotovoltaic combustors. |
| 分类号 | 一类/力学重要期刊 |
| WOS关键词 | THERMAL PERFORMANCE ; HEAT-TRANSFER ; HYDROGEN-AIR ; DYNAMICS ; NUMBER ; LIMIT ; INSTABILITY ; CONVERSION ; INTERPLAY ; GEOMETRY |
| 资助项目 | Bureau of International Cooperation, Chinese Academy of Sciences10.13039/501100005200[025GJHZ2022112FN] ; International Partnership Program of the Chinese Academy of Sciences |
| WOS研究方向 | Mechanics ; Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:001544653500012 |
| 资助机构 | Bureau of International Cooperation, Chinese Academy of Sciences10.13039/501100005200 ; International Partnership Program of the Chinese Academy of Sciences |
| 其他责任者 | 吕钰 |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/102199]  |
| 专题 | 力学研究所_非线性力学国家重点实验室 |
| 作者单位 | 1.Natl Univ Singapore, Dept Mech Engn, Singapore 117575, Singapore; 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 101408, Peoples R China 3.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China; |
| 推荐引用方式 GB/T 7714 | Chen, Lu,Lv Y. Linear stability analysis of a premixed flame in curved micro-combustors[J]. PHYSICS OF FLUIDS,2025,37(8):12. |
| APA | Chen, Lu,&吕钰.(2025).Linear stability analysis of a premixed flame in curved micro-combustors.PHYSICS OF FLUIDS,37(8),12. |
| MLA | Chen, Lu,et al."Linear stability analysis of a premixed flame in curved micro-combustors".PHYSICS OF FLUIDS 37.8(2025):12. |
入库方式： OAI收割
来源：力学研究所
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