Abstract
The effects of the shape of the blade, the tip clearance and the sectional profile of the tip blade on fan noise were investigated experimentally. Analyzing the boundary layer for the suction side of blade, the effects of the seperation point on sound pressure level were clarified. It was found that the most suitable construction for the fan noise reduction was the blade inclined toward the rotative direction, the small tip clearance and the cut-off blade of the tip section in the pressure side.
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