渦巻ポンプ羽根車内のキャビテーション気泡の挙動

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  • Behavior of cavitation bubbles in a centrifugal pump impeller.
  • ウズマキ ポンプ ハネグルマナイ ノ キャビテーション キホウ ノ キョドウ

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To obtain the behavior cavitation bubbles in a radial-flow impeller pump, the equation of motion of a bubble and the Rayleigh equation expressing the change in the bubble diameter are solved simultaneously based on the flow field calculated numerically by a three-dimensional finite element method for an idealized potential flow. Also the effects of suction pressure, size of bubble, and discharge rate of water are discussed. When the bubble is in the range of pressure lower than the critical one, it grows abruptly, and the trajectories of the bubble shift toward the shroud surface and the direction of impeller rotation. In such ranges, the cavitation bubbles grow to a visible size. When the discharge rate of water becomes larger, the shift of bubble trajectories is intensified.

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