収縮・拡大ノズルを流れるサブクール液体窒素のキャビテーション流動不安定現象

書誌事項

タイトル別名
  • Cavitation Flow Instability of Subcooled Liquid Nitrogen in Converging-Diverging Nozzles
  • シュウシュク カクダイ ノズル オ ナガレルサブクール エキタイ チッソ ノ キャビテーション リュウドウ フアンテイ ゲンショウ

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抄録

The cavitation flow instability of subcooled liquid nitrogen in two types of converging-diverging (C-D) circular nozzles with throat diameters of 1.5 and 2.0 mm was experimentally investigated. Flow observations were also performed to clarify the instability phenomenon and the differences in cavitation behavior between the two nozzles. The cavitation mode changed from continuous mode to intermittent mode as the temperature of the subcooled liquid nitrogen decreased. This change occurred in both C-D nozzles when the temperature of the liquid reached approximately 76 K. Occurrence of the intermittent mode accompanying large-flow oscillations was considered to be caused by a drastic reduction of the speed of sound in the single-component, vapor-liquid flow because the speed of sound restricted the throat velocity in the C-D nozzle during cavitation. Oscillation pressure values in intermittent mode were much larger than those in continuous mode, peaking between 74 and 76 K. The magnitude of the oscillation pressure in intermittent mode could be evaluated from the difference between the throat static-pressure immediately prior to the occurrence of cavitation and that during cavitation.

収録刊行物

  • 低温工学

    低温工学 46 (9), 539-550, 2011

    公益社団法人 低温工学・超電導学会 (旧 社団法人 低温工学協会)

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