単独翼形のキャビテーション流れに及ぼす溶存空気の影響

抄録

The aim of this study is to clarify effects of dissolved air on cavitating flow around an isolated Clark Y hydrofoil. We conducted observations of instantaneous cavity shapes by high-speed camera, measurements of lift and drag forces and number density distribution of bubble nuclei in different conditions of dissolved air at two angles of attack. As a result, the number density of bubble nuclei increased with growth of cavity in high dissolved air condition. On the other hand, such increase is not observed regardless of cavity development in low dissolved air condition. Inception cavitation number and characteristics of lift and drag forces are different between the conditions of dissolved air particularly in the case of small angle of attack.