冷却ファンから発生する広帯域騒音の予測に関する実験的研究

抄録

The experimental prediction methodology of the broadband noise as the first step to organize the blade elementary momentum theory for a cooling fan is proposed. For the prediction equation of the broadband noise, the theory on the acoustic radiation from airfoil with turbulent boundary layer is applied. The broadband noise of the cooling fan is predicted experimentally by using the measured flow regime in the wake of the actual fan based on the results of wind tunnel test on the aerodynamic noise of a flat plate. The prediction by the suggested methodology could explain that the broadband noise in the low frequency domain in the operation point of the cooling fan is influenced by the wake vortex noise in the pressure side separation.