This paper presents a modified analytical model to evaluate the trajectories of various lift separation sabot configurations.The aerodynamic forces acting on the sabot surfaces during a supersonic flight are modeled i...This paper presents a modified analytical model to evaluate the trajectories of various lift separation sabot configurations.The aerodynamic forces acting on the sabot surfaces during a supersonic flight are modeled in the present analytical model by incorporating the pressures on the windward side of the sabot due to the detached/attached shock and its reflections and then integrated using the 3-DoF dynamical equations.The trajectory and the aerodynamic coefficients were obtained for these configurations at a projectile Mach number of 3.The sabot configurations,which include two new designs,are compared with each other and with the conventional free flight trajectory data of the conventional sabots.The mechanical interaction between the sabot and projectile is also addressed in the present work.The comparison shows that the new designs with the aerodynamic surfaces close to the center of gravity,lift-off from the projectile with minimal mechanical interaction compared to a conventional sabot.展开更多
With the advantages of simpler structure, smaller disturbance and no self-hurt while discarding sabot, the gas-propelled amor-piercing projectile with discarding sabot (APDS) owns its promissing prospect. This paper h...With the advantages of simpler structure, smaller disturbance and no self-hurt while discarding sabot, the gas-propelled amor-piercing projectile with discarding sabot (APDS) owns its promissing prospect. This paper has studied the gas-filling and ejecting characteristics between the gas chamber iir saber and the environment. A dynamical model describing the sabot-discarding process I?as been established The authors have also given the starling condition and the parting criterion of the parting motion during the sabot-discarding. The mellon of fire gas-propelled APDS has been carefully calculated. Finally, the effect of the gashole area has been analyzed not only on the pressure in the gas chamber near the barrel exit, but also on the sabot-discarding time and distance away from the barrel.展开更多
在飞行过程中,弹托要减小对弹体的干扰并实现快速分离,其基本前提是自身结构设计合理。为优化弹托结构设计,本文采用用户自定义函数(User-Defined Functions,UDF)和动网格技术,耦合计算流体力学和六自由度(Six Degrees of Freedom,6DOF...在飞行过程中,弹托要减小对弹体的干扰并实现快速分离,其基本前提是自身结构设计合理。为优化弹托结构设计,本文采用用户自定义函数(User-Defined Functions,UDF)和动网格技术,耦合计算流体力学和六自由度(Six Degrees of Freedom,6DOF)外弹道方程,通过仿真计算了尾翼稳定脱壳穿甲弹在不同弹托结构下的弹托分离过程,得到了弹托分离过程流场的演变情况、弹托与弹体之间的激波和气流相互耦合作用效果、弹托的6DOF轨迹参数及其对弹体各项气动力和力矩系数的影响规律。结果表明:长弹托的脱壳过程相对平稳,轴向运动较弱,同时刻弹托俯仰角更小,前腔面积较大时分离后期翻转和偏航运动更加突出,中腔面积对弹托运动影响较小;适当减小弹托长度、增大前腔面积和减小中腔面积可有效减小对弹体气动力和力矩系数的扰动,加快弹托分离,提高弹体的飞行稳定性。展开更多
文摘This paper presents a modified analytical model to evaluate the trajectories of various lift separation sabot configurations.The aerodynamic forces acting on the sabot surfaces during a supersonic flight are modeled in the present analytical model by incorporating the pressures on the windward side of the sabot due to the detached/attached shock and its reflections and then integrated using the 3-DoF dynamical equations.The trajectory and the aerodynamic coefficients were obtained for these configurations at a projectile Mach number of 3.The sabot configurations,which include two new designs,are compared with each other and with the conventional free flight trajectory data of the conventional sabots.The mechanical interaction between the sabot and projectile is also addressed in the present work.The comparison shows that the new designs with the aerodynamic surfaces close to the center of gravity,lift-off from the projectile with minimal mechanical interaction compared to a conventional sabot.
文摘With the advantages of simpler structure, smaller disturbance and no self-hurt while discarding sabot, the gas-propelled amor-piercing projectile with discarding sabot (APDS) owns its promissing prospect. This paper has studied the gas-filling and ejecting characteristics between the gas chamber iir saber and the environment. A dynamical model describing the sabot-discarding process I?as been established The authors have also given the starling condition and the parting criterion of the parting motion during the sabot-discarding. The mellon of fire gas-propelled APDS has been carefully calculated. Finally, the effect of the gashole area has been analyzed not only on the pressure in the gas chamber near the barrel exit, but also on the sabot-discarding time and distance away from the barrel.
文摘在飞行过程中,弹托要减小对弹体的干扰并实现快速分离,其基本前提是自身结构设计合理。为优化弹托结构设计,本文采用用户自定义函数(User-Defined Functions,UDF)和动网格技术,耦合计算流体力学和六自由度(Six Degrees of Freedom,6DOF)外弹道方程,通过仿真计算了尾翼稳定脱壳穿甲弹在不同弹托结构下的弹托分离过程,得到了弹托分离过程流场的演变情况、弹托与弹体之间的激波和气流相互耦合作用效果、弹托的6DOF轨迹参数及其对弹体各项气动力和力矩系数的影响规律。结果表明:长弹托的脱壳过程相对平稳,轴向运动较弱,同时刻弹托俯仰角更小,前腔面积较大时分离后期翻转和偏航运动更加突出,中腔面积对弹托运动影响较小;适当减小弹托长度、增大前腔面积和减小中腔面积可有效减小对弹体气动力和力矩系数的扰动,加快弹托分离,提高弹体的飞行稳定性。
