类HTV-2高超声速滑翔飞行器的本体光辐射特性分析

The Analysis of Infrared Radiation Characteristics of HTV-2-like Hypersonic Gliding Vehicle Body

第二代"猎鹰"高超声速技术飞行器(Falcon Hypersonic Technology Vehicle 2,HTV-2)长时间在大气层中飞行时,气动热是导致本体光辐射特性的主要原因。气动热预测和复杂结构传热温度求解是本体光辐射特性研究的关键。基于类HTV-2高超声速滑翔飞行器的结构以及飞行弹道特点,建立了适用于高超声速滑翔飞行器的气动热、三维有限元传热和本体光辐射耦合计算方法。在算法验证的基础上,通过计算获得了类HTV-2高超声速滑翔飞行器沿假定弹道飞行的本体光辐射特性。结果表明,红外探测器从地面70°方向观测的辐射强度大于从天上-70°方向观测的辐射强度;中波3~5μm光辐射强度明显大于长波8~12μm和短波0.4~0.7μm,因此选择3~5μm波段更有利于对类HTV-2高超声速滑翔飞行器进行探测。

When falcon hypersonic technology vehicle 2(HTV-2) flies in the atmosphere for a long time, aerodynamic heating is the main reason of body infrared radiation characteristics. Aerodynamic thermal prediction and heat transfer in complex structures are key points of the research on infrared radiation characteristics. Based on the structure and flight trajectory characteristics of HTV-2-like hypersonic gliders, coupling calculation methods of aerodynamic heat, three-dimensional finite element heat transfer and body infrared radiation for hypersonic gliding vehicles are established in this paper. On the basis of algorithm verification, the infrared radiation characteristics of HTV-2-like hypersonic gliders which fly along the assumed trajectory are calculated. The radiation intensity observed by the infrared detector from the ground in the 70° direction is greater than that from the sky in the-70° direction. The infrared radiation intensity at 3~5 μm medium waveband is obviously greater than that of 8~12 μm long waveband and 0.4~0.7 μm short waveband. Choosing 3~5 μm band is more beneficial to detect HTV-2-like hypersonic gliding vehicles.