プロペラファンの騒音低減化に関する実験的研究 : 第1報, 空力特性

概要

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Both the aerodynamic- and the noise-characteristics were investigated focussing on the effects of various parameters such as the axial position of propeller fan relative to the duct, the duct width, the shape of the duct inlet and the tip clearance in order to design a lower-noise and higher-efficiency propeller fan. In this paper, the aerodynamic characteristics are discussed. The peak efficiency increases to a level much higher than that of an ordinary ducted fan provided that the location of the propeller fan is beyond the upstream end of the duct. The peak efficiency is highest when half of the propeller fan width is outside the upstream end under the condition that the duct length is about a half of the fan width. Also the peak efficiency increases as the tip clerance becomes smaller.
1990-11-25