Study on the Effect of Sub-Caliber Asymmetry Canards on the Aerodynamics of Trajectory Correction Projectiles

To investigate the aerodynamics of trajectory correction projectiles (TCP) with sub-caliber asymmetry canards, a numerical model was established based on the assembling mesh, and its accuracy was validated by the results of wind tunnel tests. The effect of canards on TCP was analyzed in three aspects: flow around canards, lift and drag coefficients as well as the roll moment supplied by spin canards. The results indicate that the drag coefficient increases by 14% than conventional projectiles, but the lift created by maneuver canards improves the percentage of range reduction to 10%. The cant angles of canards have more significant effect on lift than drag. The TCP's lift is contributed by two parts: surfaces of maneuver canards and the asymmetry pressure distribution on projectiles for the existence of canards. A simplified model was utilized to express the lift coefficient with a confounding factor obtained by curve fitting.