计算空气动力学飞机红外辐射强度估算方法

Estimation Method of Aircraft Infrared Radiant Intensity Based on Aerodynamic Computation

结合CFD技术和红外辐射理论发展了一种飞机红外辐射强度估算方法。首先通过欧拉方程数值模拟来获得飞机表面温度场分布,然后应用结合粘性附面层理论进行壁面温度计算分析。在获得了飞机表面温度分布数据之后,采用灰体辐射理论估算全机红外辐射强度。进行某喷气式飞机红外辐射强度估算研究,分析有/无尾焰情况的飞机红外辐射强度计算结果,初步验证了所提出方法的可行性。所提出的红外辐射估算理论对于飞机红外隐身与高生存力设计具有一定的参考价值。

According to aerodynamic computation and infrared radiant theory,a method is proposed to estimate the aircraft infrared radiant intensity.Firstly,the aircraft surface temperature field is obtained by solving the flow control equation,namely the Euler equation.Then,the aircraft wall temperature is computed by using the viscous boundary layer theory.After getting the distribution of aircraft surface temperature,using the grey body radiant concept,the aircraft infrared radiant intensity is analyzed.Taking the infrared radiant intensity computation of a jet plane as an example,the infrared radiant intensity considering the exhaust plume is compared with that not considering the exhaust plume,and the feasibility of the proposed method is verified.The proposed infrared radiant intensity estimation method is useful for aircraft infrared stealth and survivability design.