Double-layer acoustic metasurface for the suppression of the Mack second mode in hypersonic boundary-layer flow

Xudong Tian, Tuo Liu, Tiantian Wang, Jie Zhu, Chihyung Wen

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

An acoustic metasurface consisting of two layers of perforated plates is proposed for suppression of the Mack second mode in hypersonic boundary-layer flow. The upper layer with very tiny holes is permeable to acoustic waves and hardly alters the background hypersonic boundary-layer flow, offering rather low resistive and inductive components of surface acoustic impedance. The bottom layer with large and sparse square holes is attached to a rigid wall surface and forms a periodic array of chambers, each covering multiple holes of the upper layer, which can adjust the impedance phase by working as a capacitive component. Based on a linear stability analysis of hypersonic boundary-layer instability, such an acoustic metasurface satisfying the required surface impedance is designed and numerically investigated. The results show that the metasurface can efficiently suppress the Mack second mode over a relatively wide bandwidth. This work provides an alternative strategy for the design of porous walls for hypersonic boundary-layer stabilization.

Original languageEnglish
Article number074105
JournalPhysics of Fluids
Volume34
Issue number7
DOIs
Publication statusPublished - 5 Jul 2022

ASJC Scopus subject areas

  • Computational Mechanics
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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