Aerodynamic configuration design of gliding extended range guided bomb

To improve the range of guided bomb, the scheme of aerodynamic configuration of extended range GPS guided bomb was put forward based on the gliding extended range technique. The designed aerodynamic configuration was the tail control configuration having great span-chord ratio up-wing and the tail/rudder with "×" form. By aerodynamic characteristics calculation and analysis, the parameters of configuration geometry were determined. Wind tunnel experiments were conducted for two models of wing stretch-out and wing folded model, respectively. The experiment conditions were as follows. The rolling angles are φ=0 (wing is horizontal, tail is"×"form), 22.5° and 45.0°. The Mach number are Ma=0.6, 0.8 and 1.0. The angles of attack are α=0~12°. The rudder deflection angles are δ _z=0; δ _z=-5°, -10°(pitching control); δ _y=-5°, -10°(yawing control); δ _x=-5°, -10°(rolling control). Experiment results indicate that the designed GPS guided bomb's longitudinal stability and controllability match well, and the controlling efficiency of tail rudder is very high. The angle of attack being propitious to gliding flight is from 4° to 6° and the maximal lift-drag ratio is greater than 10. From the experiment result, it could be concluded that the effective range of the guided bomb would over 120 km while it is released at 12 km altitude.