球形离散颗粒抑制尾喷流红外辐射传输数值模拟

Numerical simulation on infrared radiation suppressant of hot exhaust with the spherical particles

以气溶胶烟雾红外抑制技术为背景,以Mie散射理论为基础,利用Fluent软件计算获得气固两相流场,采用射线踪迹法（RTANM）编制红外辐射传输计算程序开展了球形固体微粒环尾喷流喷射抑制喷流红外辐射传输数值模拟研究.研究参数主要考虑颗粒本身的光学特性以及颗粒在喷流射流中的扩散规律对抑制效果的影响.研究表明,各种影响因素中粒径对红外抑制率的影响最为显著,3-5μm范围内粒径在1.0μm左右最佳.

Based on aerosol infrared radiation （IR） stealth technique, the characteristics of IR suppressant （3-5 μm） on hot exhausts with spherical particles has been numerically investigated. The extinction characteristic parameters including extinction efficiency factor and asymmetry factor were calculated based on Mie scattering theory, which is decided by diameter parameter and complex index of refraction. The flow field was achieved by Fluent software, and IR radiation intensity of the target was calculated by ray-tracing-method. The parameters investigated include diameter parameter, complex index of refraction, concentration of the particles, injection velocity of the particles and coefficient of heat conduction of the particles. The results show that IR suppressant affected by the diameter parameter of discrete particles is the most prominent. And the best IR suppressant exists when the diame- ter of particles is in the range of 1.0μm.