Measurement of Aerodynamic Sound Source around a Circular Cylinder by Particle Image Velocimetry  

作　　者：Yasuyuki Oguma Takayuki Yamagata Nobuyuki Fujisawa 

机构地区：[1]Department of Mechanical Engineering, Nihon University, Koriyama, Japan [2]Visualization Research Center, Niigata University, Niigata, Japan

出　　处：《Journal of Flow Control, Measurement & Visualization》2014年第3期105-109,共5页流量控制、测量及可视化（英文）

摘　　要：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.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.

关 键 词：Aerodynamic Sound PIV Noise Source Circular CYLINDER VORTEX SHEDDING Experimental Technique 

分 类 号：O3[理学—力学]