描述:
随着末敏子弹威力半径的提高,一次抛撒很难把大量末敏子弹均匀散布到较大目标面积,进行二次抛撒成为末敏子母弹抛撒的发展方向。 本文以航空子母弹二次抛撒系统为研究对象,设计了二次抛撒具体方案,选择小型固体火箭发动机作为二次抛撒的动力装置,确定了相应的抛撒机构和发动机总体方案。使用内弹道理论,进行内弹道性能的预估,根据发动机的工作压强,得到了发动机的转速;在以上基础上对燃烧室壳体强度和喷管二维定常流进行仿真计算,确定了燃烧室壳体的厚度和喷管的型面。 在结构方案的基础上,采用经典外弹道理论,建立了子母弹二次抛撒系统抛撒过程的外弹道模型,确定出第一次抛撒条件;通过对第二次抛撒落点散布进行仿真计算后,得出方案的落点散布满足设计要求;对模拟子弹药进行气动力数值模拟,为以后的弹道研究提供数据参考;设计了发动机性能测试的试验方案。本文为具体的工程实践提供了有益借鉴。With the increase of the terminal sensing ammunition’s power radius these years, it is difficult to throw more terminal sensing ammunition over a larger target area only by once throwing. This promotes the development of twice throwing, which is now the research direction of terminal sensing ammunition throwing system. This thesis focuses on the twice-throwing technology of subminution throwing system. The detailed design of the twice throwing system is presented. The small solid rocket motor is employed to perform as the power of the twice throwing system, and then we confirm the collective design of the throwing framework and the rocket motor. We verify the effectiveness of the design via simulation of the rocket motor's interior ballistics, and obtain the rotate speed of the rocket motor. Finally, we obtain the thickness of firebox shell and the model of nozzle through the numerically simulation. According to the proposed framework, we establish the models of exterior ballistic trajectory during the throwing procedure of cargo-projectile using the classic exterior ballistic theory. Through the simulations of the obliquitous angle and the attacked angle, the condition of the first projection is then deduced. The distribution of the falling point is also evaluated by the simulation of moving laws of the sub-projectile, which shows that our design meets the design requirements; The numerically simulations about the aerodynamic characteristics of artillery projectile,will be potential basis for the latter researching in this topic;Finally, the proposed practical experiments scheme in this thesis, which can evaluate the validity and efficiency of the motor in throwing system. This thesis can be used as reference for detailed engineering practice.