宇航材料工艺2012，Vol.42Issue(2)：30-33,4.
气动加热下光学窗口传热特性的数值模拟
Numerical Simulation on Heat Transfer Characteristics of Optical Windows Under Aerodynamic Heating
摘要
Abstract
The radiation and conduction coupled heat transfer processes in optical windows under aerodynamic heating are studied in order to understand the thermal emission characteristics and the thermal protection properties. A computational model for the coupled heat transfer in optical windows with Fresnel interfaces is established by FVM, MCM and spectral band model. The heat transfer characteristics for a specific optical window with two SiO2 glass layers are numerically simulated. Results show that the glass layer under aerodynamic heating has net radiation emission and the other layer has net radiation absorption. Radiative flux in the optical window is greater than conductive flux except in the vicinity of the heated surface. The radiative flux in the wavelength between 2. 9 μm and 4. 2 μm is greater than in the wavelength between 0.4 μm and 2. 9 μm where the radiative flux going into spacecraft interior through the optical window has the lowest value in the visible spectrum and the highest value in the mid infrared spectrum. In the case of the optical window total thickness unvaried, decrease in both the gas conductivity and the gas layer thickness can effectively lower the steady state temperature of the optical window's unheated surface.关键词
气动加热/光学窗口/耦合传热/辐射/谱带模型Key words
Aerodynamic heating/Optical window/Coupled heat transfer/Radiation/Spectral band model引用本文复制引用
李东辉,夏新林,艾青..气动加热下光学窗口传热特性的数值模拟[J].宇航材料工艺,2012,42(2):30-33,4.基金项目
国家自然科学基金(90816022,51176038) （90816022,51176038）
