TY - GEN
T1 - Control of flow-induced noise by structural compliance
AU - Naseer, Muhammad Rehan
AU - Arif, Irsalan
AU - Leung, Randolph Chi Kin
N1 - Funding Information:
The authors gratefully acknowledge the support from the Research Grants Council of the Government of Hong Kong Special Administrative Region under grant number 15208520. The first author is grateful to stipend support to his study from the Department of Mechanical Engineering, The Hong Kong Polytechnic University. The second and third authors are grateful to a generous research donation from Philip K. H. Wong Foundation under grant number 5-ZH1X (now N-ZH1X).
Publisher Copyright:
© ICA 2022.All rights reserved
PY - 2022/10/25
Y1 - 2022/10/25
N2 - Flow-induced noise generation by external flow devices operating at low to intermediate Reynolds number is an overriding concern associated with their design and operations. Over the years, a number of passive noise control methods have been proposed and developed, however their implementation is limited by the associated aerodynamic performance degradation. In this regard, we propose a novel method of utilizing the structural compliance for noise reduction of external flow devices with minimum or no sacrifice in the overall aerodynamic characteristics. The key idea is to design a structurally compliant elastic surface that vibrates in structural resonance fluid loading for absorbing the energy from the flow to sustain its vibration. We have implemented the method for the two unique noise generation problems: a deep cavity flow driven by flow-acoustic resonance and a symmetric airfoil exhibiting feedback phenomenon. The effectiveness of the compliant surface in tonal noise reduction for both test cases is analyzed numerically using high-fidelity direct aeroacoustic simulations. Despite the prevalence of different flow regimes, the application of compliant surface provides a significant overall noise reduction for each case up to different extents. Design strategy of the compliant surface along with its limitations are also discussed.
AB - Flow-induced noise generation by external flow devices operating at low to intermediate Reynolds number is an overriding concern associated with their design and operations. Over the years, a number of passive noise control methods have been proposed and developed, however their implementation is limited by the associated aerodynamic performance degradation. In this regard, we propose a novel method of utilizing the structural compliance for noise reduction of external flow devices with minimum or no sacrifice in the overall aerodynamic characteristics. The key idea is to design a structurally compliant elastic surface that vibrates in structural resonance fluid loading for absorbing the energy from the flow to sustain its vibration. We have implemented the method for the two unique noise generation problems: a deep cavity flow driven by flow-acoustic resonance and a symmetric airfoil exhibiting feedback phenomenon. The effectiveness of the compliant surface in tonal noise reduction for both test cases is analyzed numerically using high-fidelity direct aeroacoustic simulations. Despite the prevalence of different flow regimes, the application of compliant surface provides a significant overall noise reduction for each case up to different extents. Design strategy of the compliant surface along with its limitations are also discussed.
KW - Airfoil Tonal noise
KW - Deep Cavity
KW - Structural Compliance
UR - http://www.scopus.com/inward/record.url?scp=85162279048&partnerID=8YFLogxK
M3 - Conference article published in proceeding or book
AN - SCOPUS:85153701127
T3 - Proceedings of the International Congress on Acoustics
SP - 169
EP - 173
BT - 24th International Congress on Acoustics, ICA 2022
T2 - 24th International Congress on Acoustics, ICA 2022
Y2 - 24 October 2022 through 28 October 2022
ER -