流れ場の時系列解析に基づく空力騒音の実験的評価法(流体工学,流体機械)

概要

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We propose experimental evaluation methods for dipole sound based on the vortex sound theory. By using time-resolved PIV in a wind tunnel test, we measured time series data of the unsteady two-dimensional flow around a circular cylinder which is suitable for applying the theory and validating the methods. The sound pressure in a far field estimated experimentally from PIV measurement is validated through comparison with 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 estimated dipole sound and measured flow field. As a result, 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 regions and the vortex formation region in the wake causes the estimated dipole sound.
2009-07-25