Abstract: Based on the advantages of computational fluid dynamics and the firing range prediction of base bleed projectile, the flight ballistic trajectory of base bleed projectile is solved by using the computational aerodynamics coupled with particle trajectory, and the change laws of operating parameter, operating state, and flow filed of base bleed projectile with time are obtained. The results show that the base bleed parameters of the base bleed projectiles launched at different altitudes increase with the increase in time in early drag reduction stage, but it varies slowly with the increase in time in the late drag reduction stage; with the increase in altitude for launching, the drag coefficient of the base bleed projectile increases slowly with the increase in time in the drag reduction stage, and even it decreases with the time. For the base bleed projectile launching at altitude of 0 km, the base bleed device in the early drag reduction stage operates in the mode of base bleed. And in the late stage, the base bleed device operates between base bleed mode and rocket mode.

Key words: ordnance science and technology, computational fluid dynamics, base bleed projectile, particle trajectory, firing range