Evacuation Characteristics of a Grooved Axial Flow Pump. Effects of turbulent flow transition at high back pressures.

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  • Kanki Tatsuo
    Department of Chemical Engineering, Faculty of Engineering, Himeji Institute of Technology
  • Kanbe Toshikazu
    Department of Chemical Engineering, Faculty of Engineering, Himeji Institute of Technology

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Other Title
  • ねじ溝型軸流ポンプの排気特性　高背圧域における乱流遷移とその効果
  • ネジ ミゾガタ ジクリュウ ポンプ ノ ハイキ トクセイ コウ ハイアツイキ
  • Effects of turblent flow transition at high back pressures
  • 高背圧域における乱流遷移とその効果

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Abstract

Turblent flow in a rectangular groove faced with a moving plate was analyzed numerically based on the mixing-length theory. The numerical results for the flow were applied to the pressure-smoothed model, to evaluate the evacuation characteristics at high back-pressures of a screw-grooved axial flow pump. The results are compared with the experimental results. Evacuation performance is found to be improved when operation is at high back-pressures. This is attributed to the entry of gas flow in the groove into the turblent regime. Evacuation performance is also found to be greater for a heavier gas rather than a lighter one, as well as when operation is at low back-pressure. Relations of attainable pressure difference against back-pressure at a given rotational speed of the rotor are explained well by the smoothed pressure model.

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