Numerical Research on Effect of Base Bleed Type on Operation Process of Base Bleed Projectile

The edge base bleed type is presented in this paper. Based on the advantages of computational fluid dynamics and the firing range prediction of base bleed projectile, the flight ballistic of base bleed projectile with two kinds of base bleed type is solved by using the computational aerodynamics coupled with particle trajectory, obtained the change laws of operation parameter, flow filed of base bleed projectile with time. The results show that: The performance of the edge base bleed type is better than that of the traditional center base bleed type, and the fire range of the base bleed projectile with edge type is about 2 km higher than that of the center type. The base bleed parameter of the two kinds of base bleed type at the state of drag reduction increase first and then decrease with the increase of time. For the center base bleed type, the drag coefficient increases with time. For the edge base bleed type, the drag coefficient is nearly stable at the reduction state, and is always smaller than that of the center base bleed type. The base flow structure of the edge base bleed type does not change with both the time and base bleed parameter. The base bleed gas always forms the main recirculation zone at the bottom of projectile and plays the role of drag reduction.