Aerodynamic and Noise Characteristics of Bladed Multiple-Disk Fans. 1st Report, Effects of the Existence of Blades, the Gap of Disks and the Location of Blades.

概要

論文の詳細を見る
An experimental study of both noise and aerodynamic characteristics of a multiple-disk fan was carried out with respect to the effects of three parameters: (1) the existence of blades, (2) the gap of disks, (3) the location of blades. It was shown that the bladed multiple-disk fan exhibited higher pressure head and the fan efficiency than the non-bladed multiple-disk fan, though the noise generated from the former was higher by 3 to 6 dB than that of the latter. The fan efficiency and noise increased proportional to the gap of disks, and it was experimentally shown that a 0.7mm gap gave the lowest specific noise level among the impellers tested in this experiment. Concerning the location of blade, when the distance between the trailing edge of the blade and the cutoff was larger than 13mm, the discrete frequency noise generated by the interference between the blade and the cutoff became lower than the level of turbulent noise. We also obtained the experimental result that the multiple-disk fan with a 13mm distance between the blade and the cutoff had the lowest specific noise level.
一般社団法人日本機械学会の論文