Wind-tunnel studies are conducted to evaluate the potential of actuated forebody strakes to provide increased levels of yaw control on fighter aircraft at stall and post-stall angles of attack where conventional aerodynamic controls are ineffective. The studies involved low-speed wind-tunnel tests of actuated forebody strake concepts applied to a generic fighter model and included circumferential pressure and flow visualization surveys on an isolated forebody. Results showed that the actuated forebody strake concept can provide high levels of yaw control over wide angle-of-attack and sideslip ranges. However, significant interaction effects that reduced the yaw control effectiveness of the strakes or induced coupled rolling and pitching moments occurred when lifting surfaces were placed in close proximity to the forebody/strake combination. Two fundamentally different flow mechanisms were identified that were responsible for the yawing moments generated by the strakes.
Wind-Tunnel Investigation of Actuated Forebody Strakes for Yaw Control at High Angles of Attack
1987
95 pages
Report
Keine Angabe
Englisch