Noise reduction mechanism of airfoils with leading-edge serrations and surface ridges inspired by owl wings

Author:

Wang LeiORCID,Liu XiaominORCID,Li DianORCID

Abstract

The remarkable characteristics of the silent flight of owls provide infinite inspiration for the low-noise operation of the rotating impeller machinery. However, how the characteristics of owl wings, including the leading-edge serrations, trailing-edge serrations, and plumed surfaces, affect the aerodynamic noise has not been studied comprehensively. According to previous research, the noise reduction level of an airfoil with an extensive sinusoidal profile is limited to a certain degree. In this paper, as a new coupling element, the surface ridge of owl wings is added to the airfoils with leading-edge serrations. Based on the NACA0012 (National Advisory Committee for Aeronautics) airfoil, the bionic airfoils with sinusoidal, serrated, and iron-shaped leading-edge serrations and surface ridges are reconstructed and studied to reveal the noise reduction mechanism of the coupled elements. The hybrid numerical method of large eddy simulation combined with the acoustic analog equations is adopted to predict the far-field acoustic characteristics. The vortex dynamic method is used to exposit the noise reduction mechanism of biomimetic flow control. The results demonstrate that the airfoil with iron-shaped leading-edge serrations has the best effect of noise reduction. Relative to the original airfoil, the sound pressure level is reduced by 14.3 dB. The change of streamwise vortices caused by the biomimetic structures leads the regular large-scale tubular vortices to separate into smaller horseshoe vortices. In addition, the correlation coefficient of spanwise is reduced, and the change of time-averaged vorticity in the space field promotes the attenuation effect of sound source caused by sound pressure fluctuation radiation.

Funder

Foundation for Innovative Research Groups of the National Natural Science Foundation of China

National Key Research and Development Program of China

Publisher

AIP Publishing

Reference40 articles.

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.7亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2025 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3