Aerodynamic noise simulation of porous medium-coated cylinder: Broadband hump noise mechanism and effects of permeability and pores distribution on tonal noise

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration Pub Date : 2025-03-05 DOI:10.1016/j.jsv.2025.119046

Weimeng Kong , Jin Zhang , Peiqing Liu

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引用次数: 0

Abstract

The porous medium layer can effectively control the aerodynamic noise generated by the flow around a cylinder. To analyze the internal flow within porous media and the impact on aerodynamic noise, a quasi-microscopic porous medium model composed of a square cylinder array is adopted. Based on the lattice Boltzmann method (LBM), simulations under different porosities and pores per inch (PPI) at

R e = 8.2 \times 10^{4}

have been performed. The results indicate that the porous medium induces additional mid-to-high-frequency broadband hump noise, which is generated from vortex shedding of the porous medium skeleton units (PSUs). This study investigates the impact of varying permeability on the frequency and maximum sound pressure level (SPL) of tonal noise while keeping effective mean diameter and porosity constant respectively. With a fixed effective mean diameter, an increase in permeability leads the frequency and maximum SPL of tonal noise firstly decreasing and then stabilization. Under a fixed porosity, no discernible correlation is observed between variations in the permeability and the maximum SPL and frequency of tonal noise. The research on PPI reveals that the circumferential PPI does not exert a significant influence on tonal noise maximum SPL, and reducing radial PPI yields a substantial decrease in tonal noise maximum SPL.

查看原文本刊更多论文

多孔介质涂层气缸的空气动力噪声模拟：宽带驼峰噪声机理以及渗透率和孔隙分布对音调噪声的影响

多孔介质层可以有效地控制圆柱绕流产生的气动噪声。为了分析多孔介质内部流动及其对气动噪声的影响，采用了方柱阵列组成的准微观多孔介质模型。基于晶格玻尔兹曼方法（LBM），在Re=8.2×104处进行了不同孔隙率和每英寸孔隙率（PPI）下的模拟。结果表明，多孔介质会产生额外的中高频宽带驼峰噪声，这是由多孔介质骨架单元（psu）的涡流脱落产生的。本文研究了在保持有效平均直径和孔隙度不变的情况下，不同渗透率对音调噪声频率和最大声压级的影响。在有效平均直径一定的情况下，渗透率的增加导致音调噪声的频率和最大声压级先降低后稳定。在孔隙度固定的情况下，渗透率的变化与最大声压级和音调噪声频率之间没有明显的相关性。PPI的研究表明，周向PPI对音调噪声最大声压级的影响不显著，降低径向PPI可显著降低音调噪声最大声压级。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Sound and Vibration 工程技术-工程：机械

CiteScore

9.10

自引率

10.60%

发文量

551

审稿时长

69 days

期刊介绍： The Journal of Sound and Vibration (JSV) is an independent journal devoted to the prompt publication of original papers, both theoretical and experimental, that provide new information on any aspect of sound or vibration. There is an emphasis on fundamental work that has potential for practical application. JSV was founded and operates on the premise that the subject of sound and vibration requires a journal that publishes papers of a high technical standard across the various subdisciplines, thus facilitating awareness of techniques and discoveries in one area that may be applicable in others.