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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.

nihon kikai gakkai ronbunshū. b

Investigation for Secondary Flow and Loss Generation Mechanisms within Centrifugal Impeller by Using Rotating Curved Duct (1st Report, Influence of Rossby Number)