Effects of Lewis number on the blowout process of jet flames

Yei Chin Chao, Chih Yung Wu, Ruey Hung Chen, Kuo Yuan Lee, Tsarng Sheng Cheng

Research output: Contribution to conferencePaperpeer-review


The effect of Lewis number on blowout process of jet flames was studied experimentally. Various fuels (H2, CH4, and C3H8) and diluents (Ar, N2, and CO2) were used to vary the Lewis number of fuel. For H2 and CH4 flames, the blowout velocity increased linearly with the fuel Lewis number (LeF) in LeF < 1 and LeF > 1 regions, respectively. However, for the C3H8 flame, the blowout velocity decreased linearly with increasing LeF in the LeF < 1 region. The large discrepancies found between the measured blowout parameters and the theoretical critical values proposed by Broadwell et al. indicated that Lewis number effects must be included in the theoretical models. Local effective Lewis number affected flame structures during blowout process. The Lewis number affected the stability characteristics and the instability modes in the lifted flame base that may modify the blowout process leading to the onset of flame receding and consequently change the blowout velocity.

Original languageEnglish
Number of pages1
Publication statusPublished - 2002 Dec 1
Event29th International Symposium on Combustion - Sapporo, Japan
Duration: 2002 Jul 212002 Jul 26


Other29th International Symposium on Combustion

All Science Journal Classification (ASJC) codes

  • Engineering(all)


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