Experimental study of cavity flow behavior on a 2-D hydrofoil

To obtain information on the cavity flow behavior, an experimental study of the external and internal flows of a cavity occurring on a 2-D hydrofoil w as performed in a closed-type cavitation tunnel. The liquid phase velocitie s and their fluctuations in the flow field inside and outside the cavity we re measured by using a Laser Doppler Velocimeter (LDV) in different cavitat ion states. In addition, the corresponding cavitation aspects were observed photographically by means of a xenon flash lamp with an exposure time of 1 mu S and a high-speed video. The results show that the averaged velocity p rofiles inside the cavity are similar to those in the single phase boundary layer. However, strong fluctuation and intermittent reverse flow occur wit hin the cavity, especially in the region near the bottom.