Stabilization effect of acoustic metasurfaces on broadband disturbances in a Mach 6 boundary-layer flow

Zhao, Rui; Fan, Yuxiang; Liu, Xiao; Wen, Chih-Yung

doi:10.1063/5.0131427

Physics of Fluids

2022

DOI: 10.1063/5.0131427

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Stabilization effect of acoustic metasurfaces on broadband disturbances in a Mach 6 boundary-layer flow

Rui Zhao

Yuxiang Fan

Xiao Liu

et al.

Abstract: In this study, acoustic metasurfaces are optimized to suppress the broadband frequencies of unstable modes in a Mach 6 boundary-layer (BL) flow. The metasurface is cut into five pieces, and the geometrical parameters of each piece are optimized to afford a comprehensive admittance response to the local frequencies of the first and second modes. It shows the designed broadband metasurface not only is advantageous for stabilizing disturbances above the metasurface region but also inhibits the fast growth rate of… Show more

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Cited by 3 publications

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Stabilization of hypersonic boundary layer by combining micro-blowing and a porous coating

Liu,

Zhao,

Wen

et al. 2023

Acta Mech

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Stabilization of hypersonic boundary layer by combining micro-blowing and a porous coating

Liu,

Zhao,

Wen

et al. 2023

Acta Mech

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Stabilization mechanisms of various acoustic metasurfaces on the second mode in hypersonic boundary-layer flows

Liu,

Dong,

Long

et al. 2023

Physics of Fluids

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Acoustic metasurfaces have been shown to stabilize the Mack second mode in the hypersonic boundary layer through various acoustic wave manipulations, but the stabilization mechanisms still lack unified clarification. In the present work, momentum potential theory is used to develop a physics-based analysis of the perturbance flow field above three kinds of acoustic metasurfaces: the absorptive, impedance-near-zero, and reflection-controlled metasurfaces. It found the thermal-acoustic source term Pta contributes the most to the instability, and the main differences in the stabilization mechanisms of the various metasurfaces can be derived from the distributions of Pta. The absorptive metasurface largely restrains the negative Pta term near the surface and slightly attenuates it near the critical layer. The impedance-near-zero metasurface generates a positive contour under the critical layer, while the reflection-controlled metasurface induces additional positive Pta intertwining along the critical layer. In addition, a uniform macroslit surface without particular acoustic characteristic is verified to stabilize the Mack second mode because the recirculation zones inside the macroslits attenuate the near-surface negative Pta. By deflecting the reflective waves, additional larger positive Pta could be produced and wrapped along the critical layer and that achieves a more prominent stabilization performance by designing a reflection-controlled macroslit surface.

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Roughness effect of an acoustic metasurface on supersonic boundary layer transition

Wang,

Yang,

Zhou

et al. 2023

Applied Physics Letters

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Roughness is a key property of an acoustic metasurface in determining the laminar-to-turbulent transition of a supersonic boundary layer, and the investigation of its effects requires consideration of the real microstructures inside the metasurface without any simplification. This work experimentally studies the transition behavior of the boundary layers over four different metasurfaces in a supersonic low-noise wind tunnel. Using a nanoparticle-based planar laser scattering technique and an intermittency factor analysis, it is found that the rough metasurfaces considered here tend to increase the probability of boundary layer transition more than a smooth flat plate. It is also found that the roughness of a metasurface as represented by its longitudinal scale is positively correlated with the turbulence onset probability and exhibits an interesting linear trend.

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Stabilization effect of acoustic metasurfaces on broadband disturbances in a Mach 6 boundary-layer flow

Cited by 3 publications

References 24 publications

Stabilization of hypersonic boundary layer by combining micro-blowing and a porous coating

Stabilization of hypersonic boundary layer by combining micro-blowing and a porous coating

Stabilization mechanisms of various acoustic metasurfaces on the second mode in hypersonic boundary-layer flows

Roughness effect of an acoustic metasurface on supersonic boundary layer transition

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