後縁騒音モデルに基づく低速プロペラファンの広帯域騒音の予測

概要

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Recent years, the trailing-edge noise model proposed by Prof. Michel Roger et al. in 2005 is utilized in the field of the aerodynamic noise prediction. In this report, the analytical theory is explained focusing on the mathematical description about the back-scattering model. Moreover, the prediction on the broadband noise spectra generated by a propeller fan with the semi-empirical models of the flow regime is discussed. The radiation integral of the disturbance pressure on the blade wall is given by the Amiet's model which is the scattering equivalent sources as if the airfoil were infinite in the upstream direction; the Corcos' model is employed for the span-wise correlation length. Furthermore, the wall pressure spectrum of the Gliebe's model on the blade is used. It was clarified that the aerodynamic noise sources formed by the back-scattering of the disturbance in the vicinity of the trailing edge produce the broadband noise in the high frequency domain.