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Broadband design of acoustic metasurfaces for the stabilization of a Mach 4 boundary layer flow

Advances in Aerodynamics 2022年第1期4卷 286-303页

作者： Rui Zhao Xiao Liu Chihyung Wen Xiaoyong Wang School of Aerospace Engineering Beijing Institute of TechnologyBeijing100081China Department of Aeronautical and Aviation Engineering The Hong Kong Polytechnic UniversityHong KongChina State Key Laboratory of High Temperature Gas Dynamics Institute of MechanicsChinese Academy of Sciences100190BeijingChina

A piecewise acoustic metasurface is designed to suppress the first mode while marginally amplifying the Mack second mode in a Mach 4 flat-plate boundary layer(BL)*** results of linear stability theory(LST)and the eN method demonstrate the stabilization effect and transition delay performance,***,the direct numerical simulation(DNS)results indicate that the designed broadband acoustic metasurface actually weakly excites the first mode with a slightly larger fluctuating pressure amplitude at the surface,which is in contrast to the analysis of *** discrepancies are found to lie in the‘roughness’effect caused by the recirculation zones inside the microslits and the alternating expansion and compression waves induced at the slit edges,which significantly amplifies the first *** further clarification of the competitive mechanism between the acoustic stabilization and‘roughness’destabilization effects of metasurfaces on the first mode,a carefully designed metasurface is installed at the maximum growth rate region,which excites the first mode on the metasurface but inhibits its development downstream.

关键词： Boundary layer stabilization acoustic metasurfaces Mack modes High-speed flow

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Refined acoustic holography via nonlocal metasurfaces

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Science China(Physics,Mechanics & Astronomy) 2024年第7期67卷 113-123页

作者： Shuhuan Xie Hongyu Ma Junmei Cao Fangshuo Mo Qian Cheng Yong Li Tong Hao Institute of acoustics School of Physics Science and EngineeringTongji UniversityShanghai 200092China Center for Spatial Information Science and Sustainable Development Applications Tongji UniversityShanghai 200092China College of Surveying and Geo-Informatics Tongji UniversityShanghai 200092China

Holography can provide the desired wavefront phase and/or amplitude for imaging,particle manipulation,bacteria trapping,and cell patterning in optics and ***,previous work on acoustic holography is mostly based on local design optimization,either using active control of the sound source or relying on the structural design to provide the desired *** precise control over the acoustic field remains a significant ***,we realize refined single-plane symmetric binary amplitude,asymmetric intensity gradient amplitude,and bi-objective hologram through the non-local holographic imaging theory that considers the acoustic coupling of structural units in *** taking into account the self-radiation and mutual radiation between many small units on a plate of well-designed thickness,as well as the transmission through the plate's apertures,we can effectively regulate the sound field behind the *** demonstrate the effectiveness of our approach through numerical simulations and experiments,showcasing a circle,a black hole,and a bi-objective with a circle and a square ***,the acoustic black hole hologram precisely reconstructs the intensity gradient distribution at two bright *** non-local holographic imaging theory is valuable for the fine-intensity regulation of the sound field and is expected to be applied in ultrasound diagnosis and treatment,medical imaging,and other fields.

关键词： acoustic holograms non-local interactions fine intensity modulation acoustic metasurfaces

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Controlling acoustic orbital angular momentum with artificial structures:From physics to application

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Chinese Physics B 2022年第9期31卷 41-55页

作者： Wei Wang Jingjing Liu Bin Liang Jianchun Cheng Key Laboratory of Modern acoustics MOEInstitute of AcousticsDepartment of PhysicsCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China

acoustic orbital angular momentum(OAM)associated with helicoidal wavefront recently attracts rapidly-growing attentions,offering a new degree of freedom for acoustic *** to the unique dynamical behavior and inherent mode orthogonality of acoustic OAM,its harnessing is of fundamental interests for wave physics,with great potential in a plethora of *** recent advance in materials physics further boosts efforts into controlling OAM-carrying acoustic vortices,especially acoustic metasurfaces with planar profile and subwavelength *** to their un-conventional acoustic properties beyond attainable in the nature,acoustic artificial structures provide a powerful platform for new research paradigm for efficient generation and diverse manipulation of OAM in ways not possible before,enabling novel applications in diverse scenarios ranging from underwater communication to object *** this article,we present a comprehensive view of this emerging field by delineating the fundamental physics of OAM-metasurface interac-tion and recent advances in the generation,manipulation,and application of acoustic OAM based on artificial structures,followed by an outlook for promising future directions and potential practical applications.

关键词： acoustic orbital angular momentum acoustic metamaterials acoustic metasurfaces acoustic communications

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