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首页> 外文期刊>Combustion Science and Technology >FUEL LEWIS NUMBER EFFECTS IN UNSTEADY BURKE-SCHUMANN HYDROGEN FLAMES
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FUEL LEWIS NUMBER EFFECTS IN UNSTEADY BURKE-SCHUMANN HYDROGEN FLAMES

机译：非稳态伯克-舒曼氢火焰中的燃料路易斯数效应

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摘要

Flame response (as determined by temperature and flame thickness) to unsteady hydrodynamics has been measured in acoustically pulsed Burke-Schumann hydrogen flames at two different oscillation frequencies and amplitudes. The effect of fuel Lewis number (Le_F) on flame dynamics is isolated by investigating steady and unsteady 40% H_2/60% He (Le_F> 1) and 40% H_2/60% Ar (Le_F<1) flames. For a given flame with Le_F<1, local temperature was found to increase with stretch imparted on the reaction zone by the unsteady flow, whereas the opposite trend was observed for the Le_F > 1 flame. Unsteadiness might qualitatively alter the effect of the fuel Lewis number. Notably, for Le_F < 1 flames under oscillations of sufficiently high frequency and amplitude, the temperature at the flame tip is higher than that in the shoulder regions, and is different from the temperature field of both steady and low-frequency oscillation flames. This suggests that the effect of unsteady flame stretch may overwhelm that of the flame curvature for sufficiently high unsteadiness.
机译：已经在两个不同的振荡频率和振幅的声脉冲Burke-Schumann氢火焰中测量了对不稳定流体力学的火焰响应（由温度和火焰厚度确定）。通过研究稳定和不稳定的40％H_2 / 60％He（Le_F> 1）和40％H_2 / 60％Ar（Le_F <1）火焰，隔离了燃料路易斯数（Le_F）对火焰动力学的影响。对于给定的Le_F <1火焰，发现局部温度随不稳定流动在反应区施加的拉伸而增加，而Le_F> 1火焰则呈现相反的趋势。不稳定可能会从质量上改变燃料路易斯数的影响。值得注意的是，对于在足够高的频率和振幅的振荡下的Le_F <1火焰，火焰尖端的温度高于肩部区域的温度，并且不同于稳定振荡和低频振荡火焰的温度场。这表明，对于足够高的不稳定度，不稳定火焰扩展的效果可能会超过火焰曲率的影响。

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