多板式層流ファンに関する研究 : スクロール広がり角が性能に及ぼす影響

概要

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The effects of scroll divergence angles on the performance characteristics of a multiple-disk laminar flow fan and the flow condition around an impeller are experimentally investigated. The discharge angle of the fluid leaving the impeller is very tangential and the velocity is very large at the higher impeller efficiency point. The use of a large divergence angle scroll, for the conversion of the angular momentum in this flow to the high-pressure head, causes large pressure loss due to deceleration when the fluid leaving the impeller flows into the scroll casing. Moreover, in the case of the large divergence angle scroll, the flow conditions around the impeller are very nonuniform. On the other hand, in the case of the small divergence angle scroll, the flow conditions around the impeller are very uniform and the fan efficiency increases, but the pressure loss due to the scroll wall friction is very large at the large flow rate operating range.
社団法人日本機械学会の論文
1992-05-25