Abstract
Aerodynamic noise reduction of a circular cylinder using longitudinal grooves was experimentally investigated by measuring noise and velocity fields with a microphone and particle image velocimetry, respectively. Experiments were performed in an acoustic wind tunnel operating at subcritical Reynolds numbers, Re = (2–6) × 104. The results indicate that the aerodynamic noise from a circular cylinder decreased by 8 and 5 dB compared with a smooth circular cylinder when the ratio of groove-depth to cylinder-diameter is set to 0.010 and 0.017, respectively. Velocity field measurements suggested a downstream shift in flow separation on the circular cylinder and a corresponding decrease in turbulence intensities near the wake of the grooved circular cylinder. Furthermore, the spanwise correlation of streamwise velocity fluctuations decreased near the wake of the grooved circular cylinder. These results demonstrated that aerodynamic noise reduction and variation in turbulence structure occurred in circular cylinders with longitudinal grooves at subcritical Reynolds numbers.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of Wind Engineering and Industrial Aerodynamics
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
