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首页> 外文期刊>Combustion and Flame >Initiation and formation of the corrugated structure leading to the self-turbulization of downward propagating flames in a combustion tube with external laser absorption
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Initiation and formation of the corrugated structure leading to the self-turbulization of downward propagating flames in a combustion tube with external laser absorption

机译：波纹结构的形成和形成导致燃烧管中具有外部激光吸收的向下传播火焰的自湍流

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摘要

Combustion tube (length 45 cm, inner diameter 5 cm) experiments with flames of premixed gas of C_2H_4/ CO_2-O_2 (Le ＜ 1) were conducted. The flame fronts propagated downward to the closed bottom of an open-ended tube. An initially steadily propagating flat flame was deformed by an external laser irradiation method to investigate its evolution under the interaction with acoustic vibration. Results showed that the locally deformed flame evolved into a corrugated structure at the flame front followed by self-turbulization. The process to form this corrugated structure was investigated in detail based on the images captured using high-speed cameras. From the observations, a possible mechanism for the initiation of the corrugated structure, explained mainly by periodic acoustic acceleration, was proposed. Then, according to the mechanism an alternative definition for the inverse Froude number is proposed in this work and used as criterion for the initiation of the corrugated flame structure. To prove the validity of the criterion two mixtures having different flame speed were tested and it was confirmed that the criterion provided transition condition very well for both tested mixtures.
机译：用C_2H_4 / CO_2-O_2（Le ＜1）的预混气体火焰进行燃烧管（长45 cm，内径5 cm）的实验。火焰锋面向下传播到开口管的封闭底部。通过外部激光辐照方法使最初稳定传播的平面火焰变形，以研究其在与声振动相互作用下的演化。结果表明，局部变形的火焰在火焰前沿演变成波纹状结构，随后发生自湍流。基于使用高速相机捕获的图像，详细研究了形成这种波纹结构的过程。从观察结果中，提出了一种起波纹结构的可能机理，主要由周期性声加速来解释。然后，根据机理，在这项工作中提出了反弗洛德数的替代定义，并将其用作引发波纹火焰结构的标准。为了证明该标准的有效性，测试了两种具有不同火焰速度的混合物，并确认该标准为两种测试混合物提供了很好的过渡条件。

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