中文摘要：

针对光学头罩热辐射干扰饱和问题,应用有限元法模拟了飞行高度为15 km,马赫数Ma=4时不镀膜CVD Zn S光学头罩和表面镀上1 300 nm Hf O2的CVD Zn S的光学头罩的温度场分布情况。根据光学头罩的温度场分布,仿真得到头罩干扰辐射强度的分布,从而对光学头罩的气动热辐射效应进行评估。模拟结果表明,不镀膜和镀膜CVD Zn S光学头罩的温度值相差不大,但是Hf O2薄膜对CVD Zn S光学头罩的热辐射干扰饱和产生明显的延迟,提高了光学头罩抗热辐射效应的能力。

英文摘要：

In order to study the jammer saturation of thermal radiation effect on optical domes,the finite element analysis was used to discover the distribution of thermal field around the optical dome when flying at Ma = 4,altitude15 km in a standard atmosphere,respectively for two optical domes- the chemical vapor deposition（ CVD） Zn S and the CVD Zn S with 1 300 nm Hf O2 films. Then,the radiation intensity distribution of the domes was obtained by simulation according to the nonhomogeneous temperature distribution. And then the pneumatic thermal radiation effect of optical dome was assessed. The numerical results show that the temperature of the optical dome CVD Zn S and that of CVD Zn S with Hf O2 films are almost the same. However,the Hf O2 films can noticeably delay the jammer saturation of thermal radiation effect,and thereby improve the optical dome＇s resistance to thermal radiation.