On the sound produced by flow interaction with a wall mounted finite length cylinder

Abstract

A cylinder immersed in flow is often considered a source of unwanted sound and is relevant to a wide range of engineering applications including aircraft landing gear, rail pantographs and automotive side-mirrors. To investigate this flow-induced noise source, this paper examines the sound generated by a wall mounted finite length circular cylinder in cross-flow. Noise measurements have been taken in an anechoic wind tunnel at the University of Adelaide at a range of flow speeds and for a variety of aspect ratios (cylinder length to diameter ratio) to determine the influence of these parameters on noise generation. The experimental data presented in this paper give further insight into the underlying sound generation mechanism and can be used to validate numerical predictions of flow-induced noise from wall mounted finite length cylinders.