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针对易受敌方红外制导武器攻击的地面军事目标,模拟并计算出其红外辐射特征。通过合理的假设,将复杂的三维辐射与对流耦合传热问题简化为一维瞬态传热问题,运用多层有限差分的数值计算方法计算模拟出目标瞬时温度变化方向图,得出其动态红外特征。在此基础之上,分别研究了地面目标不同部位(顶部与侧面)隐身所需要的表面发射率与温差的关系。分析了在不同温差条件下目标隐身所需表面发射率随时间的变化关系。计算模拟得出目标与背景在一日之中都存在明显的温差,最大温差可达10℃左右。分析得出利用水雾隐身使目标与背景的温差控制在2℃以内可达到良好的隐身效果。
For the vulnerability of enemy infrared guided weapons attack ground military targets, simulated and calculated its infrared radiation characteristics. Through reasonable assumptions, the complex three-dimensional radiation and convective heat transfer problem is reduced to one-dimensional transient heat transfer problem. The multi-layer finite difference numerical method is used to calculate and simulate the target instantaneous temperature variation pattern. The dynamic infrared feature. On this basis, the relationship between the surface emissivity and the temperature difference required for stealth in different parts of the ground target (top and side) was studied respectively. The relationship between the surface emissivity and the time required for target stealth under different temperature conditions was analyzed. Computational simulation shows that there is a clear temperature difference between the target and the background in a day, and the maximum temperature difference can reach about 10 ° C. Analysis shows that the use of water fog stealth so that the target and the background temperature control within 2 ℃ can achieve a good stealth effect.