Experimental Study of the Darrieus-Landau instability on an inverted-‘V’ flame, and measurement of the Markstein number
Experimental Study of the Darrieus-Landau instability on an inverted-‘V’ flame, and measurement of the Markstein number
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倒“V”型火焰上 Darrieus-Landau 不稳定性的实验研究以及马克斯坦数的测量
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发表时间：
1999
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通讯作者：
G. Searby
中科院分区：
文献类型：
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作者：
Jean;G. Searby
本文介绍了在狭缝燃烧器上用二维倒“V”形火焰对丙烷-空气和富氧丙烷-空气火焰的Darrieus-Landau不稳定性增长率的实验研究。我们使用了一种新的静电偏转系统，以产生一个初始扰动的控制波长和振幅。这种空间增长的扰动的增长率测量作为波数的当量比和富氧使用高速火焰成像的函数。结果进行了分析，使用Clavin-Garcia层流火焰稳定性理论（包括温度依赖的扩散）。增长率对波数和火焰速度的依赖性是合理的，很好地代表了这个理论。作为这种分析的副产品，我们得到了Markstein数的值，对于富燃火焰，发现Markstein数随当量比减小而随氧浓度增大
Abstract 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