细水雾遮蔽红外辐射的数值分析

细水雾对热辐射有着强烈的散射和吸收，可用于舰船等军事目标的红外隐身。将水雾视为吸收、发射、各向异性散射介质，通过谱带离散处理水雾的非灰特性，利用Mie氏理论计算离散谱带内的平均光学系数，建立了8~14 m红外辐射在细水雾中的传输模型，并利用有限体积法进行了分析计算。研究发现，采用均值粒径假设计算辐射透射率时会有一定误差，应用数量矩均值粒径时Sauter粒径误差最小，线性平均粒径误差最大；水雾自身辐射与内散射对透射率的影响较大，计算中应考虑；提高水雾浓度，减小均值粒径，可有效抑制透射率。

Numerical analysis fine water sprays shielding infrared radiation

For strongly attenuating the heat radiation through scattering and absorbing effect, fine water sprays are used in military object infrared stealth. The 8-14 m infrared radiation attenuation model by water sprays was established, in which water sprays were treated as absorbing, emitting, and anisotropic scattering medium and non-grey properties were dealt with bands discretion method. The average optical parameters in the discrete spectral bands were got by Mie theory and the radiation transfer process was carried out with finite volume method. It is found that there would be some errors when the polydisperse sprays are treated as monodispersion. The errors resulting from Sauter radius is minimum, where as that from the linear average radius is maximum. The inner radiation and scatter of the sprays have biggest influence on the transmission, so it should be considered during calculations. For restraining the radiative transmission effectively, the measures of increasing the sprays concentration and decreasing the geometry average radiuses should be done.