遠心羽根出口の絶対流れの予測 : 第1報,速度分布のひずみを考慮した予測法

概要

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The analytical method of predicting the flow characteristics at the outlet of centrifugal impellers is presented taking into account the influence of velocity distortion in both the peripheral and the shroud-to-hub directions, and its effectiveness was confirmed with the measurements of flow characteristics around pump impellers. The results show that the increase of wall friction due to mixing of flow just after the impeller exit should be adequately considered to get successful prediction, and the influence of velocity distortion in the hub-to-shroud direction should also be considered for the case of parallel-walled channel width being larger than that of impeller exit, while it is negligible for the case of the channel width being equal to the latter. It is pointed out that the peripheral velocity component of the outlet absolute flow used for the determination of slip factor and theoretical head should be defined by the mass-averaged value of the section.
1984-11-25