Acoustic response of structured and randomized porous blunt trailing edges subject to turbulent boundary layers

Author:

Arcondoulis Elias J. G.1ORCID,Ragni Daniele2ORCID,Fiscaletti Daniele3,Merino-Martinez Roberto2ORCID,Liu Yu4ORCID

Affiliation:

1. School of Civil Aerospace and Design Engineering, University Walk 1 , Bristol BS8 1TR, United Kingdom

2. Faculty of Aerospace Engineering 2 , Kluyverweg 1, 2629HS Delft, The Netherlands

3. Faculty of Mechanical Engineering 3 , Mekelweg 2628CD, Delft, The Netherlands

4. Southern University of Science and Technology 4 , Shenzhen, Guangdong, 518055, People's Republic of China

Abstract

The attachment of porous media to a blunt trailing edge (TE) can significantly suppress vortex shedding processes and the related tonal noise, yet the near-wall and internal flow fields of porous media are difficult to analyze experimentally and rely on numerical simulations to elucidate the internal flow features. A structured porous trailing edge (SPTE) has been recently designed that follows a methodology of a structured porous coated cylinder. The SPTE acoustic response was compared against randomized porous media with 10 and 30 pores/in. in an anechoic wind tunnel over a range of flow velocities. Acoustic beamforming revealed that the dominant acoustic sources were at the end of the solid plate, even when a porous TE was attached. A region of integration was used to extract acoustic spectra without additional noise sources, revealing that the SPTE possesses superior noise reduction capability. Dipolar directivity patterns were observed at the vortex shedding frequency for each TE, and the coherence between microphones revealed the complex acoustic propagation of the high-frequency content. A wavelet analysis revealed how the SPTE breaks periodic vortex shedding cycles into smaller cycles over a wider frequency range, leading to an overall noise reduction relative to the other TEs.

Funder

National Natural Science Foundation of China

Publisher

Acoustical Society of America (ASA)

Reference56 articles.

1. T. F. Brooks , D. S.Pope, and M. A.Marcolini, “ Airfoil self-noise and prediction,” NASA Reference Publication 1218, NASA, Washington, DC (1989).

2. A review of trailing edge noise generated by airfoils at low to moderate Reynolds number;Acoust. Aust.,2010

3. An experimental study of airfoil instability tonal noise with trailing edge serrations;J. Sound Vib.,2013

4. Aerofoil broadband noise reductions through double-wavelength leading-edge serrations: A new control concept;J. Fluid Mech.,2018

5. Effect of serrated trailing edges on aerofoil tonal noise;J. Fluid Mech.,2020

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1.5亿篇,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 © 2019-2024 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