论文部分内容阅读
目前红外面源诱饵已成为对抗红外成像制导导弹的重要方法。鉴于此,以箔片型红外面源诱饵为研究对象,利用计算流体力学(CFD)方法得到单个箔片和两平行箔片在不同迎角下的气动力系数。通过对箔片空中运动分析,特别是考虑到燃烧力作用的特殊性,将箔片的运动分为两个阶段:起燃阶段和完全燃烧阶段,并建立了两个阶段的运动模型。在单个箔片运动模型的基础上,设置上千个箔片初始姿态和旋转角速度的概率分布情况,同时对上千个箔片求解运动方程,即可得到整个红外面源诱饵的空间运动扩散规律。仿真结果表明:在高速运动平台上垂直向上发射红外面源诱饵,其扩散形状近似为前部稀疏后部密集的锥形云团;仿真得到的面源诱饵扩散尺寸和运动位置与实测数据吻合度较高,特别是面源诱饵在x轴方向扩散尺寸误差小于5%。
At present, infrared surface source decoy has become an important method to resist infrared imaging guidance missiles. In view of this, the aerodynamic coefficient of single foil and two parallel foils at different angles of attack is obtained by CFD method. Through the analysis of the airfoil movement, especially considering the particularity of the combustion force, the foil movement is divided into two phases: light-off phase and complete combustion phase, and a two-phase motion model is established. Based on the single foil motion model, the probability distribution of the initial attitude and rotational angular velocity of thousands of foils is set, and the equations of motion are solved for thousands of foils to obtain the spatial movement and diffusion rules of the entire infrared surface source decoy . The simulation results show that the diffuse shape of infrared decoy bait is emitted vertically upwards on a high-speed moving platform, and the shape of the diffuser is similar to that of the conical cloud with densely sparse front and rear. The diffusion size and the movement position of the simulated decoy decoy are in good agreement with the measured data Higher, especially non-point source bait diffusion size error of less than 5% in the x-axis direction.