An investigation on the disturbance evolution and the transition by resonant-triad interactions with a side-frequency disturbance in a boundary layer
An investigation on the disturbance evolution and the transition by resonant-triad interactions with a side-frequency disturbance in a boundary layer
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边界层中共振三元组相互作用与边频扰动引起的扰动演化和转变的研究
DOI：
10.1063/5.0011298
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发表时间：
2020-07
影响因子：
4.6
通讯作者：
Chen Xiangzhen
中科院分区：
文献类型：
--
作者：
Zhang Yongming;Zhou Wenqiang;Chen Xiangzhen
在实际工程问题中，经常会出现频率与主频波频率接近的边频分量。在本文中，抛物化的稳定性方程研究的影响，侧频分量的发展上的一个主导频率的干扰和过渡的共振三和弦的相互作用。数值结果与实验数据和渐近分析结果定性一致。结果表明，共振波和平均流畸变不能单独触发转捩。我们确定了一个新的机制，我们称之为稳定展向波工作（SSWW）机制，这是必要的，以引起过渡，在稳定的展向波之间的非线性相互作用对三维波起着不可或缺的作用。对于带边频分量的共振三波相互作用引起的跃迁，边频波使跃迁提前，边频扰动的相对振幅而不是绝对振幅对跃迁提前起决定性作用。如果相对幅度达到40%的阈值水平，则过渡位置会受到显著影响。在这种相变中，SSWW机制仍然起作用，而边频扰动增强了SSWW机制的作用，使相变提前发生。
In practical engineering problems, there are always side-frequency components whose frequencies are close to those of the dominant-frequency waves. In this paper, the parabolized stability equations are employed to study the influence of a side-frequency component on the development of a dominant-frequency disturbance and on the transition by resonant-triad interactions. The numerical results are qualitatively consistent with the experimental data and the asymptotic analysis results. It is found that the resonant-triad waves and the mean flow distortion cannot trigger transition by themselves. We identify a new mechanism, which we refer to as the Steady-Spanwise-Waves-Working (SSWW) mechanism, which is necessary to cause transition, in that the steady spanwise waves generated by the nonlinear interaction between the pair of three-dimensional waves play an indispensable role. For the transition caused by resonant-triad interactions with a side-frequency component, the side-frequency wave makes transition occur earlier, and the relative amplitude rather than the absolute amplitude of the side-frequency disturbance plays the essential role in the transition advance. If the relative amplitude reaches the threshold level of 40%, the transition location can be affected substantially. In this kind of transition, the SSWW mechanism still works, and the side-frequency perturbation enhances the effects of the SSWW mechanism such that the transition occurs earlier.
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求解非线性抛物化稳定性方程的改进算法
影响因子：
1.7
作者：
Zhao Lei;Zhang Cun-bo;Liu Jian-xin;Luo Ji-sheng
通讯作者：
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DOI：
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发表时间：
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期刊：
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影响因子：
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3.7
作者：
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影响因子：
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作者：
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通讯作者：
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