Influence of heat loss, preferential diffusion, and stretch on a conical flame in an impinging jet flow

Shuhn Shyurng Hou, Wei Dong Hsieh, Ta Hui Lin

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


In this study, we aim at studying the structure of a negatively stretched conical methane/air flame in a positively stretched flow under the influence of preferential diffusion, curvature stretch, flow stretch, and external heat loss by using large activation energy asymptotics. Parameters for the open and closed flame tips in the analysis consist of the curvature stretch and aerodynamic straining coupled with Lewis number (Le). The curvature stretch, which is negative stretch or compression, strengthens and weakens the burning intensity of the Le>1 and Le<1 conical flame, respectively. The opposite holds for aerodynamic straining, which is positive stretch. Additionally, irrespective of Le>1 or Le<1, the external heat loss weakens the burning intensity and has a significant influence on the structure of conical flame tips. For rich methane/air conical flames (Le>1), closed tip solutions are obtained. Furthermore, the burning intensity is enhanced with increasing curvature stretch or decreasing flow stretch. Conversely, the curvature stretch weakens the burning intensity of the lean methane/air conical flames (Le<1) and eventually leads to tip opening, that is, local flame extinction. The burning intensity is further reduced with the increase of curvature stretch or external heat loss, or with the decrease of flow stretch. Note that the openings become wider for open-tip conical flames when the external heat loss increases or flow stretch decreases.

Original languageEnglish
Pages (from-to)461-471
Number of pages11
JournalJournal of the Chinese Institute of Engineers, Transactions of the Chinese Institute of Engineers,Series A
Issue number4
Publication statusPublished - 2012 Jun

All Science Journal Classification (ASJC) codes

  • Engineering(all)


Dive into the research topics of 'Influence of heat loss, preferential diffusion, and stretch on a conical flame in an impinging jet flow'. Together they form a unique fingerprint.

Cite this