Abstract
We propose an experimental evaluation method of dipole sound based on the vortex sound theory. In order to obtain an unsteady two-dimensional flow field phenomena essential to apply the theory, we measured time series data of the flow field around a circular cylinder in a wind tunnel test by using dynamic PIV. The calculated sound pressure at the far field is validated by the correlation analysis with the measured sound pressure. Furthermore, we performed a correlation analysis between the source intensity defined as the integrand in the equation of the vortex sound theory and the measured sound pressure to clarify the relationship between the calculated dipole sound and measured flow field. It is shown that the estimated sound pressure can detect the Aeolian tone due to the Karman vortex shedding. Periodic fluctuation around the shear layer separation points and the vortex formation region in the wake causes the estimated dipole sound.
