具有复杂围护结构光学窗口的传热特性分析

Analysis of Heat Transfer Characteristics of Optical Window with Complex Envelopment

针对具有复杂围护结构光学窗口传热特性,建立了高热流作用下的光学窗口及其复杂围护结构的辐射-导热传热模型,分别讨论了窗口的辐射半透明、光谱选择性、外部加热热流以及窗口尺寸对其瞬态温度响应的影响。结果表明,忽略窗口半透明特征会产生最大31.4%误差,忽略光谱选择性会产生最大40.4%误差;窗口外部气动加热热流影响显著,温度响应随热流的增大而急剧增大;窗口厚度对其传热特性的影响较大,随着厚度的增大窗口温度响应减小;而窗口半径产生的影响可忽略不计。

In order to study the heat transfer characteristics of an optical window with complex envelopment,a radiative-conductive coupled model of optical window with complex envelopment under the action of high heat flux is established.Subsequently,the effects of the radiant semitransparent feature,spectral selectivity,external heat flux and window size on the transient temperature response of the window are discussed respectively.The results show that the maximal 31.4%error occurs when the window semitransparent feature is ignored,and the maximal 40.39%error occurs when the spectral selectivity is ignored.The influence of the aerodynamic heating heat flux loading outside is significant,and the temperature response increases sharply with the increase of the heat flux.The thickness of the window also has a great impact on its heat transfer characteristics,and the temperature response of the window decreases with the increase of the thickness.However,the impact generated by the change of window’s radius is negligible.