An experimental investigation of drag and noise reduction from a circular cylinder using longitudinal grooves

Aerodynamic and aeroacoustic characteristics of a cylinder with longitudinal grooves were studied in an anechoic wind tunnel, emphasizing on drag and noise attenuation. The parallel mounted load cells and a single microphone measured the aerodynamic resistance and noise of a circular cylinder with l...

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Bibliographic Details
Published in:Physics of fluids (1994) 2021-11, Vol.33 (11)
Main Authors: Zheng, Chuntai, Zhou, Peng, Zhong, Siyang, Zhang, Xin, Huang, Xun, So, Raymond Chi-Hung
Format: Article
Language:English
Subjects:
Attenuation
Boundary layer transition
Circular cylinders
Drag reduction
Fluid dynamics
Fluid flow
Grooves
Load cells
Noise
Noise levels
Noise reduction
Physics
Reynolds number
Wind tunnels
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Summary:Aerodynamic and aeroacoustic characteristics of a cylinder with longitudinal grooves were studied in an anechoic wind tunnel, emphasizing on drag and noise attenuation. The parallel mounted load cells and a single microphone measured the aerodynamic resistance and noise of a circular cylinder with longitudinal grooves at Reynolds number ranging from 5.84 × 10 4 to 8.48 × 10 4, covering the flow regimes from the sub-critical to the post-critical states. The results show that longitudinal grooves can effectively trigger the boundary-layer transition started at a Reynolds number around 5.84 × 10 4, causing the so-called drag crisis. During the transition process, a drag reduction over 50% and a maximum noise attenuation over 15 dB can be achieved by longitudinal grooves. The variations of the drag and noise are linked to the near-field flow measurements using hot-wire in different regimes, enhancing our understanding of the problem.
ISSN:1070-6631
1089-7666
DOI:10.1063/5.0070959