Turbulent flame and the darrieus–landau instability in a three-dimensional flow
Turbulent flame and the darrieus–landau instability in a three-dimensional flow
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DOI：
10.1088/1364-7830/7/4/008
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发表时间：
2003-11
影响因子：
1.3
通讯作者：
V. Akkerman;V. Bychkov
中科院分区：
文献类型：
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作者：
V. Akkerman;V. Bychkov
基于模型非线性方程，研究了三维几何中弱湍流火焰的速度受达里厄-朗道不稳定性的影响。该方程实际地考虑了燃烧物质的大热膨胀、外部湍流和与小而有限的火焰厚度相关的热传导。用符合柯尔莫哥洛夫定律的模型来模拟外部湍流。首先分别研究了DL不稳定性和外部湍流对火焰动力学的影响，然后研究了它们在不同湍流强度值、燃烧物质的不同热膨胀和由理想绝热壁的假设管的宽度控制的不同流体动力运动长度尺度下对火焰动力学的影响。在湍流强度较弱的情况下，计算得到的速度增量与实验结果吻合较好。
The velocity of a weakly turbulent flame influenced by the Darrieus–Landau (DL) instability in a three-dimensional geometry is investigated on the basis of a model nonlinear equation. The equation takes into account realistically large thermal expansion of burning matter, external turbulence and thermal conduction related to small, but finite flame thickness. An external turbulent flow is imitated by a model obeying the Kolmogorov law. The effects of the DL instability and external turbulence are studied, first separately and then as they influence the flame dynamics together for different values of the turbulent intensity, different thermal expansion of the burning matter and different length scales of the hydrodynamic motion controlled by the width of a hypothetic tube with ideally adiabatic walls. The velocity increase obtained is in a good agreement with experimental results in the case of relatively weak turbulent intensity.