Wind Tunnel Measurements of Rolling Moment in a Swept-Wing Vortex Wake

Abstract

Some measurements of the trailing vortex system behind a 35° sweptback, tapered wing have been made in a low-speed tunnel at a chord Reynolds number of 0.5 x 10. Detailed wing loading was obtained from pressure distributions. Mean flow properties have been measured, using a non-nulling 5-hole probe, at two stations 2Vi and 5 main wing spans downstream. Induced rolling moment on two trailing wings, which intercepted the mainwing vortex system, was also measured. Judged by the circulation around the core, the shear layers had not fully rolled up at the 2Vib station. Also no further appreciable roll-up occurred at the 5b station. Furthermore, there was very little difference between the induced rolling moments measured at the two stations.