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高温环境中的金属部件 ,通常采用表面涂层技术以降低金属材料的温度和热力梯度。氧化锆、陶瓷等涂层材料对热辐射是半透明的 ,因此 ,高温下涡轮发动机的热分析需要考虑涂层内辐射换热的影响。本文考虑了各种界面辐射特性 :不透明界面和半透明界面 ,镜反射和漫反射。采用光线踪迹 /节点分析法计算了吸收、各向同性散射性介质内的辐射传递系数。结合控制容积法数值模拟了涡轮叶片和燃烧室衬垫涂层内的辐射与导热瞬态耦合换热。
Metal parts in high temperature environments typically employ surface coating techniques to reduce the temperature and thermal gradient of the metal material. Coating materials such as zirconia, ceramics and the like are translucent to thermal radiation and therefore, the thermal analysis of turbine engines at high temperatures needs to take into account the effects of radiation heat transfer within the coating. This article considers various interface radiation characteristics: opaque and translucent interfaces, specular and diffuse reflectance. The radiation transfer coefficient in the isotropic and isotropic scattering medium was calculated by ray tracing / node analysis. Combined with the control volume method, the transient coupling of heat transfer and radiation between turbine blade and combustor liner coating was simulated.