Aerodynamic and Noise Characteristics of Bladed Multiple-Disk Fans. 2nd Report, Effects of Setting Angle of the Blade, Thickness of the Disk, Inner Radius of the Disk and Number of the Blades.

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The effects of four parameters-the setting angle of the blade, the thickness of the disk, the inner radius of the disk and the number of blades-on both noise and fluid dynamic characteristics of bladed multiple-disk fans were experimentally investigated and discussed, with consideration of the measured velocity field at the outlet of the impeller. The results showed that as the setting angle increased, the pressure rise of the fan and the fan noise increased. A thicker disk produced a lower pressure rise of the fan. If the number of blades BB was less than 24, the sound power of the fan was proportional to the number of blades. However, this did not hold for BB of 36, because of the interference among blades. Judging from the specific noise level, it was recommended that the optimum design conditions be number of blades of approximately 24, the span length of 0.7mm and the setting angle of 35°.
一般社団法人日本機械学会の論文