Abstract: The aerodynamics of trajectory correction projectile (TCP) could be expressed as the function of geometry and flight state, of which model can decide the accuracy of the dynamic system directly. An engineering model suiting for the trajectory correction projectile with decoupled canards (TCPDC) is established based on the results of wind tunnel test. This model, including drag, lift, side force and pitch moment, takes the effects of complex angle of attack (AoA) and the phase angles of canards into account. The least square method is utilized to identify the parameters, and the predicted results are validated by CFD. The results show that the yaw drag caused by canards is relatively small and the error of TCP’s drag fitted by symmetry model is lower than 3.3% within the small AoA. Under the effects of complex AoA and the phase angles of canards, the lift keeps the sinusoidal feature while a secondary sinusoidal vibration arises along the curve of side force for γ_P=180°. The innovative aerodynamic model makes a foundation for the research on TCPDC’s flight characteristics.

Key words: fluid mechanics, trajectory correction, dual-spin projectile, aerodynamics, canard