Numerical Investigation of Grazing Flow on a Micro Perforated Plate Liner

Authors

1 PhD student, Ministry of Science, Research & Technology, Aerospace Research Institute, Iran.

2 Assist. Prof., Ministry of Science, Research & Technology, Aerospace Research Institute, Iran.

10.22044/jsfm.2025.15629.3932

Abstract

This study investigates the background flow field of a micro-perforated plate (MPP) liner for acoustic analysis under grazing airflow conditions. A segment of the MPP liner is modeled, and the three-dimensional Navier-Stokes equations are numerically solved using a carefully designed computational mesh. A turbulence model is employed to account for flow disturbances, and a fully developed flow boundary condition is applied at the channel entrance to optimize computational cost. The numerical results are validated against experimental data from previous studies. The impact of flow Mach number on two key mechanisms influencing the acoustic behavior of the liner is examined: (1) the vertical velocity component at the hole openings, and (2) vortex generation at and downstream of the holes. As the Mach number at the inlet of the duct increases, the amount of rotation of the vertical component of velocity along the hole also increases, which leads to changes in the acoustic properties of the liner, including its impedance. In other words, the generation of vortices downstream of the hole increases with increasing Mach number. Findings reveal that an increase in Mach number leads to higher acoustic impedance, highlighting the complex interplay between flow dynamics and acoustic performance.

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References

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Journal of Solid and Fluid Mechanics
Volume 15, Issue 3
July and August 2025
Pages 231-239

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