Study on High Specific Speed Airfoil Fans : 1st Report, Effects of Tongue Clearance & Mouth Ring Clearance

概要

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The performance and noise level of the high specific speed airfoil fan are affected by the structural factors of its casing. Of such factors the following two are thought to produce particularly pronounced effects : (1) clearance and shape of the tongue; and (2) clearance and lap of the suction cone and mouth ring. The work presented here is a study to determine the effects of such structural factors. For experimental purposes two types of tongues were developed: a skew type slanting in the direction parallel to the vane outlet width; and a modified type having a clearance changed in the same direction as above. A series of experiments was performed in single suction type airfoil fans in which these parameters were incorporated. As a result, their effects on the performance, noise level and noise spectrum of the fan were clarified, thus enabling us to obtain useful information for fan design optimization.
一般社団法人日本機械学会の論文