TY - GEN
T1 - An experimental investigation of turbulent flow over two-dimensional obstacles on a flat plate
AU - Sundeep, Shivam
AU - Bu, Huanxian
AU - Zhou, Peng
AU - Zhong, Siyang
AU - Zhang, Xin
N1 - Funding Information:
The author would like to thank The Hong Kong Research Council (RGC 16202519) for supporting this work. This work was performed at the Aerodynamics Acoustics and Noise control Technology Centre (aantc.ust.hk).
Publisher Copyright:
© INTER-NOISE 2021 .All right reserved.
PY - 2021
Y1 - 2021
N2 - Aeroacoustic and aerodynamic characteristics of the turbulent boundary layer encountering a large obstacle are experimentally investigated in this work. Obstacles with a uniform square and semicircular cross-section mounted on a flat plate are studied in wind tunnel tests, with particular interests in the shear layer characteristics, wall pressure fluctuations, and far-field noise induced by the obstacles. Synchronized measurements of the far-field noise and the wall pressure fluctuations were conducted. Additionally, the streamwise and wall-normal velocity fluctuations behind the obstacle were measured using an X-wire probe. The measured velocity profiles, spectra and the wall pressure spectra are compared, showing that the square obstacle has a significant impact on both the turbulent flow and far-field noise. The large-scale vortical structures shed from the obstacles can be identified in the wall pressure spectra, the streamwise velocity spectra, and the wall pressure coherence analysis. Within the shear layer, the pairing of spanwise vortices occurs, and the frequency of the broadband peak in the wall pressure coherence decreases as the shear layer grows downstream. The eddy convective velocities of large-scale vortical structures inside the shear layer were analyzed based on the wall pressure fluctuations.
AB - Aeroacoustic and aerodynamic characteristics of the turbulent boundary layer encountering a large obstacle are experimentally investigated in this work. Obstacles with a uniform square and semicircular cross-section mounted on a flat plate are studied in wind tunnel tests, with particular interests in the shear layer characteristics, wall pressure fluctuations, and far-field noise induced by the obstacles. Synchronized measurements of the far-field noise and the wall pressure fluctuations were conducted. Additionally, the streamwise and wall-normal velocity fluctuations behind the obstacle were measured using an X-wire probe. The measured velocity profiles, spectra and the wall pressure spectra are compared, showing that the square obstacle has a significant impact on both the turbulent flow and far-field noise. The large-scale vortical structures shed from the obstacles can be identified in the wall pressure spectra, the streamwise velocity spectra, and the wall pressure coherence analysis. Within the shear layer, the pairing of spanwise vortices occurs, and the frequency of the broadband peak in the wall pressure coherence decreases as the shear layer grows downstream. The eddy convective velocities of large-scale vortical structures inside the shear layer were analyzed based on the wall pressure fluctuations.
UR - http://www.scopus.com/inward/record.url?scp=85117400997&partnerID=8YFLogxK
U2 - 10.3397/IN-2021-2711
DO - 10.3397/IN-2021-2711
M3 - Conference article published in proceeding or book
AN - SCOPUS:85117400997
T3 - Proceedings of INTER-NOISE 2021 - 2021 International Congress and Exposition of Noise Control Engineering
BT - Proceedings of INTER-NOISE 2021 - 2021 International Congress and Exposition of Noise Control Engineering
A2 - Dare, Tyler
A2 - Bolton, Stuart
A2 - Davies, Patricia
A2 - Xue, Yutong
A2 - Ebbitt, Gordon
PB - The Institute of Noise Control Engineering of the USA, Inc.
T2 - 50th International Congress and Exposition of Noise Control Engineering, INTER-NOISE 2021
Y2 - 1 August 2021 through 5 August 2021
ER -