Reduction of interaction noise using grooved cylinder and wavy leading edge airfoil

IF 3.4 2区工程技术 Q1 ENGINEERING, MECHANICAL

Journal of Fluids and Structures Pub Date : 2024-02-22 DOI:10.1016/j.jfluidstructs.2024.104082

Xiaowei Sun , Chengchun Zhang , Chun Shen , Wen Cheng , Zhen Cui , Zhengyang Wu , Zhengwu Chen , Longwu Zhao

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Abstract

The grooved and the wavy leading edge structures have been designed to reduce the interaction noise generated by the cylinder-airfoil model. The wind tunnel tests conducted at different incoming velocities ranging from 40 to 60 m/s, revealing that the wavy leading edge structure only exhibits a noise reduction effect within the mid-frequency band (800∼4000 Hz). However, the combination of the two structures compensates for the insensitivity to low-frequency peak noise. At the velocity of 60 m/s, there are reductions of 14.7 dB for peak noise and 5.4 dB for average noise within the mid-frequency band. Numerical simulations based on large eddy simulation and the Ffowcs Williams–Hawkings acoustic analogy are performed to further explore the mechanisms of noise reduction. The results indicate that integrating the two structures has a substantial impact on reducing the pulsation pressure and enhancing the decorrelation and decoherence effects among the noise sources. The strong phase interference effect leads to a decrease in the radiation efficiency of the interaction noise.

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利用凹槽气缸和波浪形前缘翼面降低相互作用噪音

为降低气缸-翼面模型产生的相互作用噪声，设计了凹槽和波浪形前缘结构。在 40 至 60 米/秒的不同进气速度下进行的风洞试验显示，波浪形前缘结构仅在中频段（800∼4000 Hz）表现出降噪效果。然而，两种结构的结合弥补了对低频峰值噪声不敏感的问题。在速度为 60 米/秒时，中频段的峰值噪声降低了 14.7 分贝，平均噪声降低了 5.4 分贝。基于大涡流模拟和 Ffowcs Williams-Hawkings 声学类比的数值模拟进一步探讨了噪声降低的机制。结果表明，整合两种结构对降低脉动压力、增强噪声源之间的去相关性和退相干效应具有重大影响。强烈的相位干扰效应导致相互作用噪声的辐射效率下降。

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 Fluids and Structures 工程技术-工程：机械

CiteScore

6.90

自引率

8.30%

发文量

173

审稿时长

65 days

期刊介绍： The Journal of Fluids and Structures serves as a focal point and a forum for the exchange of ideas, for the many kinds of specialists and practitioners concerned with fluid–structure interactions and the dynamics of systems related thereto, in any field. One of its aims is to foster the cross–fertilization of ideas, methods and techniques in the various disciplines involved. The journal publishes papers that present original and significant contributions on all aspects of the mechanical interactions between fluids and solids, regardless of scale.