Abstract: 3D flow field of high spinning base bleed projectile is simulated using sliding mesh technology. Drag reduction characteristics of base bleed projectile at different spinning speed are studied, and the influence of rotating effect on drag reduction is also analyzed. The constraint relation between bleed parameter and spining speed under the condition of a given drag coefficient is discussed. Research results show that the drag coefficientl decreases when spinning speed increases for a same bleed parameter; the drag coefficient fisrt decreases and then increases when the bleed parameter increases at a same spinning speed; the drag reduction effect is better when the projectile spins at a high speed; the bleed parameter is an inverse relationship with the spinning speed for a given drag reduction; there is a best bleed parameter for the base bleed projectile with a certain spinning speed. These results offer reference for the research and engineering application of spinning base bleed projectile. Key

Key words: ordnancescienceandtechnology, basebleedprojectile, highspinning, dragcoefficient, bleedparameter, dragreductioncharacteristic