TY - GEN
T1 - Assessing airfoil tonal noise reduction potential using flow-induced vibration of an elastic panel at various angles of attack
AU - Irsalan, Arif
AU - Lam, Garret C.Y.
AU - Leung, Randolph C.K.
N1 - Funding Information:
The first author gratefully acknowledge the research studentship tenable at Department of Mechanical Engineering, The Hong Kong Polytechnic University. The second and third authors gratefully acknowledge the support from the Research Grants Council of the Government of Hong Kong Special Administrative Region under Grant No A-PolyU503/15, and a research donation from the Philip K. H. Wong Foundation under grant number 5-ZH1X. The provision of computational resources by University Research Facility in Big Data Analytics (UBDA) at The Hong Kong Polytechnic University is gratefully acknowledged.
Publisher Copyright:
© Proceedings of 2020 International Congress on Noise Control Engineering, INTER-NOISE 2020. All rights reserved.
PY - 2020/8/23
Y1 - 2020/8/23
N2 - In this paper the potential of airfoil tonal noise reduction using flow-induced vibration of an elastic panel mounted on NACA 0012 airfoil at low Reynolds number of 5 × 104 and angle of attack of 3? by perturbation evolution method is studied. The panel is designed to resonate in conjunction with airfoil boundary layer instabilities to absorb the flow energy while sustaining its vibrational displacement. Initially, direct aeroacoustic simulation is carried out to analyze the flow characteristics of rigid airfoil. The location and structural parameters of elastic panel are carefully evaluated to achieve the desired resonance condition. Subsequently, perturbation evolution method is utilized to study the aeroacoustic-structural interaction between the flow field and elastic panel and analyze the effectiveness of designed panel in airfoil tonal noise reduction. For the selected flow condition, numerical results reveal an average tonal noise reduction of 3.5 dB as compared to 2.1 dB for elastic panel designed for angle of attack of 5?. The enhancement in panel effectiveness at lower angle of attack is attributed to the presence of longer separation bubble which enables the panel to absorb much more energy from boundary layer instabilities within the region of separated flow on the suction surface of airfoil.
AB - In this paper the potential of airfoil tonal noise reduction using flow-induced vibration of an elastic panel mounted on NACA 0012 airfoil at low Reynolds number of 5 × 104 and angle of attack of 3? by perturbation evolution method is studied. The panel is designed to resonate in conjunction with airfoil boundary layer instabilities to absorb the flow energy while sustaining its vibrational displacement. Initially, direct aeroacoustic simulation is carried out to analyze the flow characteristics of rigid airfoil. The location and structural parameters of elastic panel are carefully evaluated to achieve the desired resonance condition. Subsequently, perturbation evolution method is utilized to study the aeroacoustic-structural interaction between the flow field and elastic panel and analyze the effectiveness of designed panel in airfoil tonal noise reduction. For the selected flow condition, numerical results reveal an average tonal noise reduction of 3.5 dB as compared to 2.1 dB for elastic panel designed for angle of attack of 5?. The enhancement in panel effectiveness at lower angle of attack is attributed to the presence of longer separation bubble which enables the panel to absorb much more energy from boundary layer instabilities within the region of separated flow on the suction surface of airfoil.
UR - http://www.scopus.com/inward/record.url?scp=85101317313&partnerID=8YFLogxK
M3 - Conference article published in proceeding or book
AN - SCOPUS:85101317313
T3 - Proceedings of 2020 International Congress on Noise Control Engineering, INTER-NOISE 2020
SP - 2485
EP - 2499
BT - Proceedings of 2020 International Congress on Noise Control Engineering, INTER-NOISE 2020
A2 - Jeon, Jin Yong
PB - Korean Society of Noise and Vibration Engineering
T2 - 49th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2020
Y2 - 23 August 2020 through 26 August 2020
ER -