激波层气体热辐射特性的计算

红外成像制导导弹在大气层内超音速飞行时光学头罩外存在激波层,为不均匀的高温气体介质。由其产生的热辐射将降低探测器信噪比,使红外图像发生畸变。为计算激波层红外辐射特性,首先采用Fastran流体分析软件实现球头外部流场的数值模拟,通过逐线计算法细致计算了外部绕流气体辐射特性,并模拟辐射传输过程,进而得到气体与光学头罩交界面上气体向光学头罩的光谱辐射亮度以及积分辐射亮度。

Calculation of Shock Wave Radiation Emissivity

When supersonic flying inside aerosphere, the shock layer of imaging IR missiles is highly uneven gas medium. Its aerothermal radiation effects degrade and distort the remote sensing images of infrared sensors. In this paper, the numerical simulation of external flow field is achieved by Fastran, and the field is calculated exactly by line-by-line method. Moreover, radiative transfer process is simulated, and the spectral radiance and integral radiance of interface between gas and dome are calculated.