水雾红外隐身的冷/热目标效应

人工水雾对抗红外成像制导导弹时，会因为蒸发对流强、辐射热流弱而使水雾形成冷目标;也可能因为辐射热流过强、散热弱而形成热目标。为详细揭示该现象，以Mie理论为基础，通过辐射传递方程和能量守恒方程的耦合计算，建立了水雾红外隐身产生冷目标或热目标效应的数学模型。应用蒙特卡洛法与本文算法作对比，验证了模型的正确性;将水雾视为吸收、发射、各向异性散射介质，考虑水雾自身辐射、多重散射和各种换热过程，比如辐射热流、两相流的热传导、热对流、紊流热扩散以及雾滴蒸发等，反映了水雾热遮蔽所产生的冷/热目标效应。

Cool/Hot Target Effect of the Water Fog Infrared Stealth

Artificial spray fog will come into being cool target because of the strong evaporation and convection but weak radiation heat flux, when it is used for defence of infrared imaging guided missile. Also, when it is the contrary condition, the water fog will come into being hot target. In order to open out the phenomenon particularly, a math model which can account for the cool/hot effect produced by water fog shielding the thermal radiation is established by coupling the calculation of radiation transfer equation and energy conversation equation, based on the Mie theory. This model is proved to be accurate in comparison with the Monte-Carlo method and Lambert-Beer’ law. The water fog is seemed as absorbing, emitting and anisotropic scattering medium, and the medium radiation, multiple scattering, target radiation flux, and environment influence such as the conductivity, convection turbulent heat diffusion and evaporation is calculated. The phenomenon of cool/hot target effect can be shown in detail with this model.