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

Abstract

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.