Abstract: In order to study the aerodynamic characteristics of the solid fuel ramjet guided projectile in different ballistic stages, three aerodynamic configurations corresponding to the states of ramjet assisting, climbing flight and gliding control are designed according to the working principle and flight characteristics of projectile. The Renault transition model is used to simulate and numerically calculate the three-dimensional flow field and aerodynamic characteristics of solid fuel ramjet guided projectile. The results show that comparison of the three aerodynamic configurations with the same shape parameters（except for canard and head bus）do not adopt the ramjet of the duck-type layout guided projectile (reference projectile), the lift resistance coefficient is the same; the drag coefficients of punching boost, gliding control, and climbing flight shape under the same conditions are increased by 50.5%,42.9% and 33%, respectively, compared to the reference drag coefficient; the gliding control shape is unfolded due to the duck rudder. The lift coefficient is larger than the other two shapes under the same conditions, and the duck rudder area is limited by the air inlet. The lift coefficient is smaller than that of the reference bomb under the same conditions; and the flow path structure inside the shape has a slight influence on the lift.Key

Key words: guidedprojectile, ramjetassisting, splicinggrid, aerodynamiccharacteristic