Author(s)

Yasuyuki Oguma^1*, Nobuyuki Fujisawa²

¹Department of Mechanical Engineering, Nihon University, Koriyama, Japan.
²Flow Visualization Research Center, Niigata University, Niigata, Japan.

In this paper, the measurement of an aerodynamic sound source for a semi-circular cylinder in a uniform flow is described using Particle Image Velocimetry (PIV). This experimental technique is based on vortex sound theory, where the time derivative of vorticity is evaluated with the aid of two sets of standard PIV systems. The experimental results indicate that the sound source for the semi-circular cylinder is located around the shear layer near the edge of the semi-circular cylinder. The sound source intensity and the area are reduced in the semi-circular cylinder compared with those of a circular cylinder. This result indicates that the aerodynamic sound of the semi- circular cylinder is smaller than that of the circular cylinder, which supports the microphone measurement result.

Aerodynamic Noise, Sound Source, Semi-Circular Cylinder, Vortex Sound Theory, Particle Image Velocimetry

Oguma, Y. and Fujisawa, N. (2016) Sound Source Measurement of a Semi-Circular Cylinder in a Uniform Flow by Particle Image Velocimetry. Journal of Flow Control, Measurement & Visualization, 4, 162-170. doi: 10.4236/jfcmv.2016.44014.