噴流クラウドキャビテーションのリエントラント挙動

（のど部長さを持つ収縮拡大ノズルにおいて）

抄録

Reentrant behavior of jet-type cloud cavitation was observed and examined by high-speed observation and image analysis in the flow inside an axis-symmetrical convergent divergent nozzle with different divergent angles. Nozzle A has a relatively small divergent angle, and the nozzle B has a larger divergent angle. For nozzle A, periodic cloud cavitation behavior is observed and reentrant behavior due to pressure waves can be confirmed. On the other hand, for nozzle B there is no periodic behavior as well as no reentrant behavior. It is found that the presence or absence of reentrant behavior of cloud cavitation changes depending on the size of divergent angle.