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- W120108124 abstract "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." @default.
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- W120108124 date "1990-01-01" @default.
- W120108124 modified "2023-09-24" @default.
- W120108124 title "Experimental study on the noise reduction of a propeller fan. 1st Report. Aerodynamic characteristics." @default.
- W120108124 doi "https://doi.org/10.1299/kikaib.56.3378" @default.
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