Modal Analysis on MVG Controlled Supersonic Flow at Different Mach Numbers
Modal Analysis on MVG Controlled Supersonic Flow at Different Mach Numbers
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DOI：
10.3390/pr10081456
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发表时间：
2022-07
期刊：
影响因子：
3.5
通讯作者：
Yong Yang;Yonghua Yan;Caixia Chen;Qingquan Wu;T. Kwembe;Ryan Wu
中科院分区：
文献类型：
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作者：
Yong Yang;Yonghua Yan;Caixia Chen;Qingquan Wu;T. Kwembe;Ryan Wu
本文对不同马赫数下微涡发生器控制的超声速流动进行了模态分析。本研究的目的是阐明顺流和环状涡型的不同特性，以及不同马赫数对这些模式的影响，从而进一步了解从MVG向下传播到激波/边界层相互作用（SWBLI）区域的涡结构。为此，进行了高阶高分辨率大涡模拟（LES），识别了超音速坡道流动中不同马赫数1.5、2.0和2.5下MVG后方和激波/边界层相互作用（SWBLI）区域的涡旋结构。然后采用适当的正交分解（POD）对波动流场的模态进行了研究。结果表明，流型和环状涡型在能量分布、结构顺序、频率和振幅等方面存在差异。随着马赫数的增加，流向模态的能量增加，而环形模态的能量相反；流向模态结构的变化比环型模态变化更明显，各模态的频率变化不大。从MVG向SWBLI区域移动的过程中，流向涡吸收了环状涡的能量，但各模态的主导频率在此过程中几乎没有变化。
Modal analysis on micro-vortex generator (MVG)-controlled supersonic flow at different Mach numbers is performed in this paper. The purpose of this investigation is to clarify the different properties of streamwise and ring-like vortical modes, and the effects of different Mach numbers on these modes, to further understand the vortical structures as they travel from MVG down to the shock wave/boundary-layer interaction (SWBLI) region. To this end, a high order and high resolution large eddy simulation (LES) was carried out, which identified the vortical structures behind the MVG and in the shock wave/boundary-layer interaction (SWBLI) region in the supersonic ramp flow with flow speeds of three different Mach numbers 1.5, 2.0, and 2.5. The proper orthogonal decomposition (POD) then was adopted to investigate the modes of the fluctuation flow field. It emerged that the streamwise and ring-like vortical modes were disparate in energy distribution, structural order, frequency and amplitude. Furthermore, it showed that as the Mach number increased, the energy of the streamwise modes increased while the opposite was true for ring-like modes; and the streamwise modal structures were altered more significantly than the ring-like modes, and the frequency of each mode scarcely varied. It was also found that the streamwise vortices absorbed energy from the ring-like vortices while they traveled from the MVG down to the SWBLI region, but the dominant frequency of each mode rarely changed during this process.