Vortex-Shedding Sound Generated by Two Circular Cylinders Arranged in Tandem

Abstract

Aerodynamic sound generated by vortices shed from two circular cylinders with different diameters arranged in tandem was investigated experimentally. The diameter ratio d/D was smaller than or equal to 1, where d and D are the diameters of the upstream and downstream cylinders respectively. The sound was represented as a function of the spacing between the cylinders L and the diameter ratio. The magnitude of sound from the upstream cylinder was found to change periodically with L. This change was explained by assuming a feedback mechanism for the flow between the cylinders.