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Study on surface tension modeling for mechanistic evaluation of vortex cavitation

液中渦キャビテーション現象を機構論的に評価するための表面張力モデル研究

伊藤 啓; 江連 俊樹; 大島 宏之; 河村 拓己*; 中峯 由彰*

Ito, Kei; Ezure, Toshiki; Ohshima, Hiroyuki; Kawamura, Takumi*; Nakamine, Yoshiaki*

ナトリウム冷却高速炉における液中渦キャビテーション研究の一環として、半径方向圧力分布と蒸気圧、気液界面における圧力ジャンプ条件に基づいてキャビティ半径を計算する表面張力モデルの開発を行い、液中渦キャビテーション評価手法を改良した。基本検証として基礎実験を対象とした評価を行い、流速の増加によって渦中心圧力が低下してキャビティ半径が大きくなるという現象が定性的に再現できることを確認した。また、液中渦キャビテーション挙動に大きな影響を与える粘性について評価を行った。

The authors have been studied the vortex cavitation in sodium-cooled fast reactors. In this paper, the authors present a modified evaluation method for vortex cavitation, in which a surface tension is modeled mechanistically. Namely, the cavity radius is calculated in consideration of radial pressure distribution, saturated vapor pressure and the pressure jump condition at an interface. As the basic validation of the developed surface tension model, numerical analyses of a simple experiment under various velocity conditions are performed. The evaluation results give qualitatively appropriate tendency, that is, the cavity radius becomes larger with the higher liquid velocity and/or lower reference pressure which cause the larger pressure drop at the vortex. In addition, the authors evaluate the influence of the kinematic viscosity which plays an important role in the vortex cavitation occurrences in the experiments.

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