Rudder Force and Moment Measurements on a 1/4-Scale SES 100 Rudder,

摘要

Force and moment measurements were obtained in the NSRDC 36-in. variable-pressure water tunnel on a high-speed rudder with a geometric aspect ratio of 1.47. Data presented adhere to Froude scaling with an attempt to scale appropriate cavitation number. The cavitation index was varied from 3.4to 0.16for angles of attack of 0to 29deg. Lift,drag,and rudder stock torque were all significantly affected by variations in the cavitation number. Additional data are presented for Froude scaling only without considering the effect of cavitation number. The report also indicates a decrease in forces and moments with ventilation of the rudder at the trailing edge versus no ventilation. (Author)