【摘要】 基于计算流体力学的优点以及目前底部排气弹射程预示问题,采用计算空气动力学和质点外弹道学耦合的方法求解底部排气弹的飞行弹道,获得在整个减阻阶段底部排气弹底排装置工作参数、工作状态、底排流场等随时间的变化规律。研究结果表明:不同海拔发射的底部排气弹在减阻阶段的排气参数均随着时间的增加而呈增大的趋势,但在减阻末阶段,变化趋势变缓;随着海拔高度的增加,阻力系数随时间的增大而增加的趋势变得平缓,甚至会出现下降的趋势;在海拔0 km发射的底部排气弹在减阻阶段前期,底排装置以底排减阻模式工作,到减阻阶段中后期,底排装置的工作模式介于底排减阻模式和火箭增程模式之间。更多还原

【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.更多还原