Experimental Investigation of the 5-Inch Chord Model of the Buships Parent Supercavitating Hydrofoil

摘要

Results of lift and drag measurements performed on a 5inch chord model of the BuShips parent hydrofoil are presented and compared with theoretical predictions. The tests were conducted in the high-speed, variable pressure, free surface, circulating water channel. They cover angles of attack ranging from 3 degrees to 15 degrees, vapor cavitation numbers from 0.06 to 2.34, depths of submergence of 1/2 and 1 chord and velocities from 30 to 52 fps. It was found that at vapor cavitation numbers which are low enough so as to approach prototype values, the ventilation hysteresis is eliminated. Results are presented in the form of tables and graphs of lift and drag coefficients for variations of angle of attack and vapor cavitation numbers. Excellent agreement was found between theory and experiment. The problems of ventilation inception are also discussed. (Author)