回転曲がりダクトによる遠心羽根車内の二次流れと損失生成機構の解明 : 第1報,Rossby数の影響(流体工学,流体機械)

概要

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The objective of this study is to reveal the effects of the passage vortex on the loss generation within a centrifugal impeller by numerically analyzing the flow within the rotating curved duct which is considered to be a simplified model for centrifugal impeller channels. In a centrifugal impeller, the behavior of passage vortex is strongly influenced by the centrifugal force caused by the curvature of the impeller passage and the Coriolis force induced by the rotation. Therefore, the Rossby number, which is defined as the ratio of the former force to the latter, is chosen as the major parameter in the present study. The computed results revealed that the location of the high loss region at the exit of the bend strongly depended on the Rossby number. Moreover, the strength of the secondary flow and the associated losses were remarkably increased by the decrease of the Rossby number less than 1.0.
一般社団法人日本機械学会の論文
2008-01-25