摘要
高速导弹光学窗口外存在激波层,为高度不均匀的高温气体介质。其热辐射效应使红外探测设备获得的红外遥感图像存在退化和畸变。通过对分子热运动的计算,分析高温气体分子、原子辐射吸收系数,将流场数据有限元处理,实现灰气体总体模型与逐线计算方法的改进结合;通过对气体介质求解辐射传递方程,基于离散传递法的思想,推衍出激波层的热辐射强度计算模型;结合光线传输模型寻找导引头探测口径内的视线路径,解析大气热辐射机理,发展激波层热辐射数值计算方法,两种定量计算模型互为比较验证。研究得出激波层热辐射噪声与来流参数之间的关系,并给出了经验公式。
The shock layer of high-speed missiles is highly uneven gas medium.Its aerothermal radiation effects degrade and distort the remote sensing images of infrared sensors.In this paper,emission and absorption coefficients of high-temperature gas molecules and atoms were calculated by investigating the thermal motion of molecules and atoms.Flow field data was processed into finite element so as to link and improve gray gas overall model and by-line calculation.With the idea of discrete transfer,the thermal radiation strength calculation model of shock layer was established by solving the radiative transfer equation.Based on the line of sight path along the seeker detectors found by the light transmission model,the mechanism of atmospheric thermal radiation was resolved and the quantitative model of the emission noise of high-temperature shock layer was obtained.The two models were compared and confirmed with each other.The relation between the shock wave thermal radiation noise and flow parameters was also analyzed.The empirical formula was given.
出处
《红外与激光工程》
EI
CSCD
北大核心
2011年第7期1199-1204,共6页
Infrared and Laser Engineering
基金
国家自然科学基金(61074184)
航空基金(20090151006)
关键词
热辐射
原子和分子
辐射传递
红外成像
thermal radiation
atoms and molecules
radiative transfer
infrared imaging
