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Laminar premixed flame fuel consumption rate modulation by shocks and expansion waves

机译：层流预混火焰燃料消耗率通过冲击波和膨胀波调制

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摘要

The main contributing effects leading to premixed laminar flame fuel consumption rate changes following variable strength shock or expansion wave passage were studied analytically and numerically. The effects were separated into two groups: gas compression, or one-dimensional effects, and flame front distortion, or two-dimensional effects. The first group was examined analytically using a one-dimensional flame model and solution of shock and expansion wave refraction. Two-dimensional effects were examined numerically using both shock and expansion wave passage through a sinusoidally perturbed propane-air laminar flame. Flame fuel consumption amplification due to the gas compression increased rapidly (from 1.3 to 24 times for Mach 1.1-1.7 shocks), while flame length amplification peaked (~15 times) at a given shock strength (~Mach 1.3). Thus gas compression became the dominant effect for stronger shocks. In contrast to the shocks, a slower reaction kinetic produced by the expansion wave passage allowed for a significantly longer period of flame length growth. This resulted in a temporary burning rate increase above initial values. The negative chemical kinetic effect of the weak expansion wave passage was temporarily offset by the flame length increase. The overall reaction rate amplification was up to four times stronger in fast/slow refractions. Also, the observed values of the flame stretch are reported in the paper.
机译：分析和数值研究了导致可变强度冲击或膨胀波通过后预混合层流火焰燃料消耗率变化的主要影响。这些效果分为两组：气体压缩或一维效果，以及火焰前畸变或二维效果。使用一维火焰模型以及冲击波和膨胀波折射的解决方案对第一组进行了分析性检查。使用冲击波和膨胀波通过正弦扰动的丙烷-空气层流火焰，对二维效应进行了数值检查。由于气体压缩，火焰燃料消耗的增加迅速增加（对于1.1-1.7马赫冲击，从1.3倍增加到24倍），而在给定的冲击强度（1.3马赫）下，火焰长度增加达到峰值（约15倍）。因此，气体压缩成为强震的主要作用。与冲击相反，膨胀波通过所产生的较慢的反应动力学使火焰长度的增长明显延长。这导致暂时燃烧速率增加到高于初始值。弱扩展波通道的负面化学动力学效应被火焰长度的增加暂时抵消了。在快速/慢速折射中，总的反应速率增强高达四倍。另外，在本文中还报告了火焰拉伸的观测值。

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