TY - GEN
T1 - Fluid-structure interactions and aeroacoustic coupling of airfoil with flexible membrane(s)
AU - Irsalan, Arif
AU - Leung, Randolph C.K.
AU - Lam, Garret C.Y.
AU - Naseer, Muhammad Rehan
N1 - Funding Information:
The authors gratefully acknowledge the support from a research donation from the Philip K. H. Wong Foundation under grant number 5-ZH1X. The first and fourth authors gratefully acknowledge the support with research studentship tenable at Department of Mechanical Engineering, The Hong Kong Polytechnic University (PolyU). The second and third authors are grateful to the support from the Research Grants Council of the Government of Hong Kong Special Administrative Region under grant number A-PolyU 503/15 and the ANR/UGC International FlowMatAc number ANR-15-CE22-0016-01.
Publisher Copyright:
© 2022 Internoise 2022 - 51st International Congress and Exposition on Noise Control Engineering. All rights reserved.
PY - 2022/8/22
Y1 - 2022/8/22
N2 - In this paper, fluid-structure interactions of a NACA 0012 airfoil mounted with short membrane(s) and its coupling effect on airfoil aeroacoustics are presented. A time-domain direct aeroacoustic simulation coupled with structural dynamics is carried out at a low Reynolds number of 50,000 to explore the aeroacoustic-structural interactions. Two different airfoil configurations based on single and dual membranes are analyzed. The membrane displacements and their impact on the flow field are characterized in wavenumber-frequency domain to analyze the structural dynamics due to flow unsteadiness within the laminar boundary layer and the resulting acoustic waves emanating from the airfoil trailing edge. A strong correlation between the membrane displacement and downstream propagating flow is observed for both configurations whereas the correlation is considerably weakened between the membrane displacement and upstream acoustic waves which ultimately results in the airfoil self-noise reduction without affecting the airfoil aerodynamics. The extent of noise reduction for dual membranes airfoil configuration is observed to be considerably higher than the single membrane airfoil configuration which corresponds to a much lower correlation among the upstream propagating acoustic waves and membrane displacement resulting in the redistribution of upstream flow energy into different frequencies.
AB - In this paper, fluid-structure interactions of a NACA 0012 airfoil mounted with short membrane(s) and its coupling effect on airfoil aeroacoustics are presented. A time-domain direct aeroacoustic simulation coupled with structural dynamics is carried out at a low Reynolds number of 50,000 to explore the aeroacoustic-structural interactions. Two different airfoil configurations based on single and dual membranes are analyzed. The membrane displacements and their impact on the flow field are characterized in wavenumber-frequency domain to analyze the structural dynamics due to flow unsteadiness within the laminar boundary layer and the resulting acoustic waves emanating from the airfoil trailing edge. A strong correlation between the membrane displacement and downstream propagating flow is observed for both configurations whereas the correlation is considerably weakened between the membrane displacement and upstream acoustic waves which ultimately results in the airfoil self-noise reduction without affecting the airfoil aerodynamics. The extent of noise reduction for dual membranes airfoil configuration is observed to be considerably higher than the single membrane airfoil configuration which corresponds to a much lower correlation among the upstream propagating acoustic waves and membrane displacement resulting in the redistribution of upstream flow energy into different frequencies.
UR - http://www.scopus.com/inward/record.url?scp=85147428381&partnerID=8YFLogxK
M3 - Conference article published in proceeding or book
AN - SCOPUS:85147428381
T3 - Internoise 2022 - 51st International Congress and Exposition on Noise Control Engineering
SP - 22
BT - Internoise 2022 - 51st International Congress and Exposition on Noise Control Engineering
PB - The Institute of Noise Control Engineering of the USA, Inc.
T2 - 51st International Congress and Exposition on Noise Control Engineering, Internoise 2022
Y2 - 21 August 2022 through 24 August 2022
ER -