Weakly Turbulent, Wrinkled Flames in Premixed Gases
Weakly Turbulent, Wrinkled Flames in Premixed Gases
复制标题
预混合气体中的弱湍流、皱纹火焰
DOI：
10.1080/00102208608959799
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发表时间：
1986
影响因子：
1.9
通讯作者：
P. Clavin
中科院分区：
文献类型：
--
作者：
G. Searby;P. Clavin
研究了在任意气体膨胀比条件下，内在稳定预混火焰锋面在弱湍流中向下传播的动力学行为。火焰以自由边界形式出现的完全流体动力学问题，用线性近似解析求解。在这种情况下，燃烧和湍流之间的相互作用在理论上得到了充分的描述。发现火焰的响应是入射湍流的频率和波数含量的函数。除了气体膨胀比之外，理论中只出现了另外两个参数，即表征弯曲火焰结构的Markstein数和基于火焰速度和火焰厚度的Froude数。湍流火焰速度对来流特性以及这些数字的敏感性被考虑在内。理论结果与最近的实验室实验结果进行了比较
Abstract The dynamic behaviour of an intrinsically stable premixed flame front, propagating downwards in a weakly turbulent incoming flow is investigated for an arbitrary gas expansion ratio. The complete hydrodynamic problem, in which the flame appears as a free boundary, is solved analytically in the linear approximation. In this case the mutual interaction between combustion and turbulence is fully described theoretically. The response of the flame is found as a function of both the frequency and wave number content of the incoming turbulence. In addition to the gas expansion ratio, only two other parameters appear in the theory, the Markstein number (characterizing the curved flame structure) and the Froude number (based on the flame speed and the flame thickness) Sensitivity of the turbulent flame speed to the characteristics of the incoming flow as well as to these numbers is considered. The theoretical results are illustrated by comparison with some recent laboratory experiments