采用瞬态球状热斗篷方法的浅层地下目标红外隐身技术

Infrared stealth for subsurface target using transient spherical thermal cloak method

由于浅层地下目标与背景土壤的热物性不同,影响了整个区域表面的温度场分布,容易被敌方探测系统发现并击毁。针对这一问题,考虑太阳辐射、天空辐射以及风速的影响,建立了埋藏地下目标的区域温度分布传热模型,揭示了不同时段埋藏地下目标对区域表面温度场的影响。在变换热力学的基础上,通过坐标变换的方法,推导出球状瞬态热斗篷的导热系数的通解表达式。根据等效介质理论,对设计的热物性参数进行均质化,并通过数值实验方法验证了基于热斗篷地下目标红外隐身技术的可行性。

Because of the difference of thermal physical properties between subsurface target and the soil,the temperature field distribution on the surface of the whole soil area is under its influence and the target is easily detected and destroyed by enemy.To solve this problem,taking into account the influence of solar radiation,sky radiation and wind speed,the heat transfer model of temperature distribution of the region containing buried target was established,which revealed the impact of buried target on the regional temperature field during different time.Based on the transformation thermodynamics,the thermal conductivity general expressions of spherical transient thermal cloak was derived by the means of coordinate transformation.According to the equivalent medium theory,the designed thermal physical parameters were homogenized and the feasible of target infrared stealth technology was verified based on the thermal cloak by numerical method.