高速旋转底部排气弹的三维流场数值模拟与分析

为研究高速旋转条件下底部排气弹的减阻特性，运用滑移网格技术进行底部排气弹三维流场的数值模拟。研究了不同转速条件下底部排气弹的减阻特性，分析了旋转效应对减阻性能的影响以及一定阻力系数下排气参数与弹丸转速的约束关系。研究结果表明：同一个排气参数下，阻力系数随转速增大而减小；同一个转速下，阻力系数随排气参数的增大呈现先减小、后增大的变化规律；高速旋转使得底部排气弹具有更好的减阻效果；减阻期望一定时，排气参数与弹丸转速呈现此消彼长的关系，对于确定转速的底部排气弹，存在着最优的排气参数。

Numerical Simulation and Analysis of 3D Flow Field for High Spinning Base Bleed Projectile

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.