Experimental Study of the Darrieus-Landau instability on an inverted-‘V’ flame, and measurement of the Markstein number
作者:
JEAN-MARIE TRUFFAUT,
GEOFF SEARBY,
期刊:
Combustion Science and Technology
(Taylor Available online 1999)
卷期:
Volume 149,
issue 1-6
页码: 35-52
ISSN:0010-2202
年代: 1999
DOI:10.1080/00102209908952098
出版商: Taylor & Francis Group
关键词: Premixed laminar flames;instability;flame strain
数据来源: Taylor
摘要:
We present an experimental study of the growth rate of the Darrieus-Landau instability on propane-air and on oxygen enriched propane-air flames using a two-dimensional inverted-“V” flame on a slot burner. We use a novel system of electrostatic deflection to produce an initial perturbation of controlled wavelength and amplitude. The growth rate of this spatially growing perturbation is measured as a function of wavenumber of equivalence ratio and of oxygen enrichment using high speed flame imaging. The results are analyzed using the Clavin-Garcia laminar flame stability theory (including temperature dependent diffusivities). The dependence of the growth rate on wavenumber and flame speed is reasonably well represented by this theory. As a by-product of this analysis, we obtain values of the Markstein number, which, for rich flames, are found to decrease with equivalence ratio and to increase with oxygen concentration
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