Simplified analysis method of the surface temperature of complex structure camouflage screen with large surface
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摘要: 伪装遮障大都有复杂的表面结构,直接建模计算对计算能力要求极高。表面结构对周围流场产生扰动影响对流传热,进而影响伪装表面温度。文中通过不断调整参数得到对表面有相似影响的多孔介质,实现伪装遮障表面结构到多孔介质的简化。采用局部建模的方法,分析三种典型伪装遮障表面结构对周围流场以及其温度场的影响,进而将其简化为对应的多孔介质。结果表明:将伪装遮障表面结构类比为多孔介质,大大减少了计算量,能够模拟大表面覆盖伪装遮障之后的表面温度,评估其伪装效果。将该简化模型用于室外平房这一具体情境中,分别模拟平房不加表面伪装和外加不同伪装遮障情况下,其表面温度和表观温度在全天不同时段的变化。Abstract: The surface structure of camouflage screen is mostly complex, and modeling calculation has high requirements for computing power. Surface structure disturbs the flow field around to influence the convection heat transfer and affects the surface temperature of the camouflage. In this paper, porous medium parameters of different values were attempted to ensure it had the same effect on the surface to get the simplification from the camouflage screen surface model to the porous medium model. Local modeling was established to analyze the influence of three typical camouflage screen surface structure on flow field around and its temperature field so that the corresponding porous medium wss found. The results show that this simplified method can greatly reduce the computational cost. This method can simulate the surface temperature of camouflage screen with large suface to evaluate the camouflage effect. The simplified model is used for outdoor bungalow situation. The infrared characteristics of outdoor bungalows and the ambient are simulated under natural conditions and the situation added and without camouflage simplified model respectively to analyze camouflage effect in day and night.
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Key words:
- infrared radiation /
- porous media /
- camouflage screen /
- camouflage effect
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