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※ 半角英数字
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Effects of fluid viscosity on occurrence behavior of vortex cavitation; Vortex structures and occurrence condition

流体粘性が液中渦キャビテーション発生挙動に与える影響; 渦構造と発生条件

江連 俊樹; 伊藤 啓; 木村 暢之; 小野島 貴光; 上出 英樹; 亀山 祐理*

Ezure, Toshiki; Ito, Kei; Kimura, Nobuyuki; Onojima, Takamitsu; Kamide, Hideki; Kameyama, Yuri*

液中渦キャビテーションついて、流体の粘性が発生に与える影響を明らかにするため、円筒の水体系における実験研究を実施した。水の動粘性及び吸込み管流速をパラメータとして数条件変化させ、流速鉛直及び水平断面における流速分布を把握した。試験の結果、フローパターンや、渦周囲の循環の大きさなど渦構造について把握するとともに、容器底面から吸込みノズルへ向けて渦が発達する過程を明らかにした。これらの結果を液中渦キャビテーション発生条件の整理に反映した。

An experimental study on vortex cavitation was carried out in a cylindrical water tank to clarify how the viscosity of fluid influences on vortex cavitation occurrences. Vertical and horizontal velocity distributions were obtained under several experimental conditions, where the kinematic viscosity of water and the velocity of suction flow were varied as parameters. As the results, the flow patterns and the vortex structures, such as the circulation around the vortex, were grasped. And also, the acceleration behavior of vortex from the bottom of tank towards the intake of suction nozzle was clarified. Then, the occurrence map of vortex cavitation was also improved by using the present experimental data.

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