Influence of angle of attack on airfoil tip noise

IF 4.9 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration Pub Date : 2025-08-27 DOI:10.1016/j.jsv.2025.119376

Guang C. Deng , Satoshi Baba , Philippe Lavoie , Stéphane Moreau

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引用次数: 0

Abstract

This study investigates the aerodynamic and aeroacoustic characteristics of airfoil tip noise for a supercritical airfoil profile at

α = 5 °

and

α = 10 °

using a hybrid noise computation approach. Wall-Resolved Large Eddy Simulations (WR-LES) were performed and validated against experimental data from the University of Toronto. The simulations captured a tri-vortex system (TVS) comprising primary, secondary, and tertiary vortices. At

α = 10 °

, upstream shifts in the primary vortex trajectory intensified interactions with the airfoil surface, resulting in amplified surface-pressure fluctuations and increased far-field noise levels. Dynamic Mode Decomposition (DMD) pinpoints dominant acoustic sources and their radiation patterns, distinguishing between duct acoustic modes below 1500 Hz and localized sources above this frequency with clear dipole radiation patterns stemming from three noise sources: the leading-edge, trailing-edge, and side-edge noise. The far-field acoustic predictions, computed using the Ffowcs Williams–Hawkings (FW-H) analogy, showed good agreement with experimental results. Both the solid and porous FW-H formulations accurately captured noise levels, with a 3 dB increase in spectral levels observed at

α = 10 °

due to enhanced aerodynamic loading and vortex dynamics. Noise decomposition showed a shift in dominant sources: trailing-edge noise prevailed at

α = 5 °

, while tip noise, driven by vortex impingement and crossover, dominated at

α = 10 °

, highlighting the complex aerodynamic-acoustic interplay.

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迎角对翼型尖噪声的影响

本文采用混合噪声计算方法研究了α=5°和α=10°超临界翼型型尖噪声的气动和气动声学特性。利用多伦多大学的实验数据进行了壁面分辨大涡模拟（WR-LES），并进行了验证。模拟捕获了一个由初级、次级和三级涡组成的三涡系统（TVS）。在α=10°时，主涡轨迹的上游偏移加剧了与翼型表面的相互作用，导致表面压力波动放大，远场噪声水平增加。动态模态分解（DMD）可以精确定位主要声源及其辐射模式，区分1500 Hz以下的管道声模式和高于该频率的局部声源，这些声源具有清晰的偶极子辐射模式，来自三个噪声源：前缘、尾缘和侧缘噪声。使用Ffowcs - williams - hawkins （FW-H）类比计算的远场声学预测结果与实验结果非常吻合。固体和多孔的FW-H配方都能准确捕获噪声水平，在α=10°时，由于气动载荷和涡流动力学的增强，光谱水平提高了3 dB。在α=5°处，尾缘噪声占主导地位，而在α=10°处，由涡流撞击和交叉驱动的叶尖噪声占主导地位，突出了复杂的气动声相互作用。

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.