On the Racing Power of Impellers

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  • 羽根車の空転損失について
  • ハネグルマ ノ クウテン ソンシツ ニ ツイテ

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Abstract

Measurements of the torque consumed by an impeller rotating in a closed vessel were obtained under the various geometrical configurations by means of a torsion balance technique. The experimental results indicate the following conclusions : (1) When the boss ratio has a value between zero and 0.6, the resisting coefficient takes constant value approximately. (2) The resisting coefficient Cf takes the maximum value for a certain number of blades of the impeller and varys in proportion to (sin θ)1/2 (θ≠0) where θ is the attack angle of blades. (3) The relation between the resisting coefficient Cf and Reynolds number Re in a smooth vessel is given by Cf ∝Re-1/6. (4) When the width of the impeller is large, the resisting coefficient of the impeller is identical with that of a disc with ribs on both sides of the surfaces. (5) The effect of the number of the blade disappears when the impeller has a shroud and the angle of blade is larger than 45 degrees.

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