Study Of Two-dimension Trajectory Correction Projectile Aerodynamic Characteristic

The modern warfare proposed high requirement of high precision and low price of the armament, trajectory correction projectile is one of this products. It could improve the hit rate by adding control system to the conventional ammunition and correcting its trajectory. At present, one-dimensional trajectory correction technology has matured and is currently the mainstream of trajectory correction projectiles; two-dimensional trajectory correction projectile will be put on the agenda, It has broad application prospects, and also is the future trends.This article taked the two-dimension trajectory correction projectile which use a drag brake and canard rudders as the research object. By numerical simulations, it analyzed that how the drag brake and canard affected the projectiles' drag coefficient, lift coefficient, pitching-moment coefficient and the pressure center coefficient. The results showed that the drag coefficient of projectile with drag brake increased significantly, and have less impact on the lift coefficient, the pressure center moved back, which is conducive to flight stability; canard have little effect on the drag coefficient, but lift coefficient increased significantly, the pressure center moves forward, which is not conducive to flight stability. The gyroscopic dynamic coefficient and dynamic stability factor of the projectile at subsonic, transonic and supersonic speeds were also calculated. The results showed that projectile has a good flight stability. The research provided references for the design of two-dimensional trajectory correction projectiles.