Effects Of Lewis Number On The Blowout Process Of Jet Flames


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.

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International Symposium on Combustion Abstracts of Works-in-Progress Posters

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Article; Proceedings Paper

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0036936503 (Scopus)

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