摘要
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%。
The surface-type infrared decoy has become an important method against infrared imaging guided missile.In this paper,foil-surface-type infrared decoy is regarded as the research object and the computational fluid dynamics（CFD）is used to obtain the aerodynamic coefficients of a single foil and two parallel foils at different angles of attack.With the analysis of foil movement in the air,the movement of the foil is divided into two phases,i.e.,the light-off and complete combustion considering the particularity of combustion pressure.And the motion models of the two stages are established.Based on the motion model of the single foil,thousands of foils＇ initial probability distribution of posture and rotating angular velocity are set and then the motion equations of thousands of foils are solved at the same time.In this way,the whole space motion diffusion rule of foil-surface-type infrared decoy is obtained.The simulation results show that the diffusion shape of surfacetype infrared decoy,which is launched vertically from high-speed motion platform,is the taper cloud with sparse front and dense rear approximately.The diffusion size and motion position of simulation are highly identical with the measured value,and the error is less than 5% of the diffusion size in x direction in particular.
出处
《航空学报》
EI
CAS
CSCD
北大核心
2016年第9期2634-2645,共12页
Acta Aeronautica et Astronautica Sinica
基金
国家自然科学基金(61471390)~~
关键词
箔片
红外面源诱饵
计算流体力学
气动力系数
燃烧力
扩散规律
foil
surface-type infrared decoy
computational fluid dynamics
aerodynamic coefficients
combustion force
dif fusion rule
