Abstract
The purpose of this paper is to propose a sound localization method as an alternative of the time-resolved particle image velocimetry (PIV) system for detecting the aerodynamic sound source of a circular cylinder in a uniform flow. The sound source intensity of a circular cylinder in a uniform flow is evaluated by measuring the time-derivative of instantaneous velocity field in the flow field using a pair of planar PIV system. It allows the visualization of the sound source intensity distribution, which is the time-derivative of the vector product of vorticity and velocity. The experimental results indicate that the aerodynamic sound is generated from the separation point and the velocity fluctuation in the separating shear layer from the circular cylinder. These results agree qualitatively with the previous findings from experiment and numerical simulation, which supports the validity of the present experimental method for evaluating the sound source intensity distribution.
Highlights
The aerodynamic sound generated from a bluff body in a stream is an important topic of interest and has been studied in literature
It is found that the sound spectrum with the circular cylinder has a peak around 370 Hz due to the generation of vortex shedding from the circular cylinder
0.19, which is in close agreement with that of the vortex shedding from a circular cylinder in literature [5]
Summary
The aerodynamic sound generated from a bluff body in a stream is an important topic of interest and has been studied in literature. Knowledge about the pressure distribution, fluid forces, flow separation, mean and turbulence characteristics on and around the circular cylinder is fundamental to understand the mechanism of aerodynamic sound These analytical and experimental studies on the sound and the flow field are summarized in review papers [4] [5], while the numerical approach to the flow induced sound has been developed due to the recent advance of computational technology [6]. A variety of experimental methods for localizing the sound sources have been proposed in literature, such as the acoustic impedance method [7], microphone array method [8], cross-correlation method [9]-[11], and the method using time-resolved particle image velocimetry (PIV) [12] [13] Among these experimental methods, the last two methods allow for localization of the aerodynamic sound sources because they can evaluate simultaneously the velocity field, which supports the understanding of the generation mechanism for aerodynamic sound. It is preferable to develop an alternative cost effective method
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