TY - GEN
T1 - Modification of broadband trailing edge noise through hairy coating
AU - Zhou, Peng
AU - Zhong, Siyang
AU - Zhang, Xin
N1 - Funding Information:
Peng Zhou wishes to thank The Hong Kong University of Science and Technology (HKUST) and Hong Kong RGC PhD Fellowship (reference number: PF16-01286) for supporting part of the PhD thesis research. This work has been partially supported by Hong Kong Research Grants Council (RGC) [project number: 16203817].
Publisher Copyright:
© Proceedings of the 26th International Congress on Sound and Vibration, ICSV 2019. All rights reserved.
PY - 2019
Y1 - 2019
N2 - An experimental study on the effect of artificial hairy coating on the broadband trailing edge noise of a flat plate was conducted and presented in this paper. The study was inspired by the hairy feather structure of quiet-flying owls. The experiment was conducted at the HKUST low speed anechoic wind tunnel, UNITED, at chord-based Reynolds number ranging between 160,000 to 300,000 at zero angle of attack. Turbulent strips were applied at 12-20% of the chord to suppress the instability noise. Three different hairy coatings with varying lengths and diameters were tested. A 56-channel microphone array was used to acquire the induced noise, as well as to investigate the effect of hairy coating on the source distribution. It was observed that the presence of hairy coating significantly reduces the trailing edge noise above a critical chord-based Strouhal number, which depends on the hair length. However, the hairy coating also produces an apparent low frequency hump in the noise spectrum below that Strouhal number.
AB - An experimental study on the effect of artificial hairy coating on the broadband trailing edge noise of a flat plate was conducted and presented in this paper. The study was inspired by the hairy feather structure of quiet-flying owls. The experiment was conducted at the HKUST low speed anechoic wind tunnel, UNITED, at chord-based Reynolds number ranging between 160,000 to 300,000 at zero angle of attack. Turbulent strips were applied at 12-20% of the chord to suppress the instability noise. Three different hairy coatings with varying lengths and diameters were tested. A 56-channel microphone array was used to acquire the induced noise, as well as to investigate the effect of hairy coating on the source distribution. It was observed that the presence of hairy coating significantly reduces the trailing edge noise above a critical chord-based Strouhal number, which depends on the hair length. However, the hairy coating also produces an apparent low frequency hump in the noise spectrum below that Strouhal number.
KW - Aeroacoustics
KW - Airfoil self-noise
KW - Hairy coating
KW - Owl
UR - http://www.scopus.com/inward/record.url?scp=85084013772&partnerID=8YFLogxK
M3 - Conference article published in proceeding or book
AN - SCOPUS:85084013772
T3 - Proceedings of the 26th International Congress on Sound and Vibration, ICSV 2019
BT - Proceedings of the 26th International Congress on Sound and Vibration, ICSV 2019
PB - Canadian Acoustical Association
T2 - 26th International Congress on Sound and Vibration, ICSV 2019
Y2 - 7 July 2019 through 11 July 2019
ER -