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Effect of external acoustic wave on thermo-acoustic instability of downward propagating flame

机译：外声波对向下传播火焰热声不稳定性的影响

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This paper presents an experimental study on the interaction between premixed flame and a sinusoidal acoustic wave externally produced by a loudspeaker, considering both frequency and acoustic power. To do that, the loudspeaker is laterally positioned at the bottom of the combustion tube through a connecting tube. At a constant input acoustic power while the experiment condition is varied with input acoustic frequencies, the results showed that the growth rate of acoustic instability is experimentally found to be higher for the combustion at input frequencies corresponding to the first harmonic mode comparing to that at the fundamental mode. This result is subsequently inconsistent to a consequence characterized by velocity coupling. Moreover, at fundamental mode the input acoustic power has a significant effect on the position of parametric instability occurrence which dominates the growth rate of acoustic instability.
机译：本文介绍了一种关于扬声器外部产生的预混火焰和外部产生的正弦声波之间的相互作用的实验研究，考虑到频率和声学功率。为此，扬声器通过连接管横向地定位在燃烧管的底部。在恒定的输入声功率下，当实验条件随输入声频而变化时，结果表明，关于与第一谐波模式相对应的输入频率的燃烧在实验上发现了声学不稳定性的生长速率。基本模式。随后该结果与速度耦合的表征的结果不一致。此外，在基本模式下，输入声学功率对参数不稳定发生的位置具有显着影响，其主导了声学不稳定的生长速率。

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