Compact customizable acoustic metamaterial liner with robust broadband performance under grazing flow
Phys. Rev. Applied 25, 034024 – Published 6 March, 2026
DOI: https://doi.org/10.1103/4r54-w468
Abstract
Acoustic liners with a compact configuration and robust performance under grazing flow are an effective approach for attenuating noise in aircraft engines, yet their practical realization remains challenging. Here, we propose a metaliner composed of double-neck embedded Helmholtz resonators (DNEHRs) covered by a wire mesh. The coupling among the liner components enables a compact design, while the intrinsic loss introduced by the wire mesh effectively suppresses resonance-induced dispersion, thereby achieving flexible and high-performance sound attenuation within an ultrathin configuration. As a proof of concept, we develop metaliners with a thickness of 45 mm, including a broadband sample achieving an average transmission loss of 20 dB from 500 to 3200 Hz and a customized sample providing spatially selective noise attenuation within 600–3200 Hz. Experimental results further demonstrate that the flow-stabilizing effect of the wire mesh endows the metaliner with enhanced stability, enabling it to maintain effective sound attenuation under grazing flow of distinct speeds. This study provides a feasible design strategy for efficient acoustic liners, with promising applications in aeroengine noise reduction and potential extensions to other flow-duct ventilation systems.
