チューブラー遠心送風機の空力特性と騒音特性の実験的研究 : 羽根車入口と出口の面積比の影響

概要

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An experimental investigation of a centrifugal fan was conducted with special attention to the effects of the casing shape on the aerodynamic and fan noise characteristics. A comparison of the fan noise and the aerodynamic characteristics of the tubular casing with those of scroll casing was made. As a result it was concluded that the aerodynamic characteristics of the fan with scroll casing were superior to those with tubular casing. The measured values of overall sound pressure level for both fans are roughly coincident. When the ratio of inlet area to the outlet area of the impeller becomes nearly unity, the fan characteristics improve. For tubular fan, the rotating noise can be controlled by proper selection of the number of impeller blades and the number of stator vanes.
長崎大学の論文