Experimental Investigation of Supercavitating Flow Over Parabolic Cavitators

In this paper experimental study was carried out to investigate supercavitation around parabolic cavitators. Various types of cavitators, such as disk, cone, and parabolic ones were designed and manufactured. Also, the shape of the cavities formed behind these bodies were considered and compared. Dimensionless parameters such as dimensionless length and diameter of cavity, as well as the dimensionless required air flow on the cavitators were obtained. The results showed that parabolic cavitators have an optimum design in comparison with disk and cone ones, due to their insignificant capability in reducing the drag force, yet the cavity’s length has a moderate size. It was also observed that this type of cavitator is capable of forming a cavity with a dimensionless length up to L/d= 33 and a dimensionless width up to D/d= 3.6. Moreover, parabolic cavitators require the highest amount of air injected in comparison with cone and disk types; therefore they operate in lower cavitation numbers. Since no other experimental data has been reported so far, this work is pioneer in experimentally reporting the behavior of parabolic cavitators