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Le effect on primary acoustic instability of downward propagating flame in a tube with external laser irradiation method

机译：用外部激光照射法在管中向下传播火焰的主要声学不稳定性的影响

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The effect of Le on the primary acoustic instability of downward propagating flame is experimentally investigated through controlling flame front structure by external laser irradiation. The convex curvature was generated immediately after laser exposure, and then the concave structure of flame front by buoyancy induced flow follows. In primary acoustic instability region, the deformations of the flame front structure by laser irradiation gives significantly difference depending on the timing of laser irradiation start, and such difference influences on acoustic pressure fluctuation. When the laser irradiation starts before the primary acoustic instability is fully saturated in Le<1, the growth rate of acoustic pressure is increased with increasing laser power during convex flame front is formed. For Le>1, the growth of acoustic pressure is very small under the presence of the convex structure. When the laser irradiation starts after primary acoustic instability is fully developed, a significant change of acoustic pressure is not observed. The experimental results show that the Lewis number affects the onset of primary acoustic instability.
机译：通过外部激光照射通过控制火焰前结构来实验研究了LE对向下传播火焰的主要声学不稳定性的影响。在激光曝光后立即产生凸曲率，然后通过浮力诱导的流动进行火焰前部的凹形结构。在主要声学不稳定区域中，通过激光照射的火焰前结构的变形根据激光照射开始的定时和对声压波动的这种差异影响而显着差异。当激光照射开始之前，在Le <1中的主声不稳定性完全饱和时，形成凸起火焰前部的激光功率增加了声压的生长速率。对于Le> 1，在凸结构的存在下，声压的生长非常小。当激光照射在主要声学不稳定性完全开发后，未观察到声压的显着变化。实验结果表明，刘易斯号码影响主要声学不稳定性的发作。

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