Modeling of thermal barrier coating temperature due to transmissive radiative heating
Modeling of thermal barrier coating temperature due to transmissive radiative heating
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DOI：
10.1007/s10853-009-3486-8
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发表时间：
2009-04
影响因子：
4.5
通讯作者：
Geunsik Lim;A. Kar
中科院分区：
文献类型：
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作者：
Geunsik Lim;A. Kar
热障涂层通常被设计成具有非常低的热导率，以减少从涂层表面到涂层下方的金属涡轮机叶片的传导热传递。然而，在高温发电系统中，在燃料燃烧期间产生相当大量的辐射热。该辐射热可传播通过涂层并加热金属刀片，从而降低涂层在降低刀片上的热负荷方面的有效性。因此，辐射性能是设计辐射阻挡涂层的基本参数。本文提出了一个辐射和传导相结合的传热模型，用于计算透明氧化钇稳定氧化锆（YSZ）涂层的稳态温度分布。该模型的结果表明，高反射率（80%）的YSZ相比，低反射率（20%）的YSZ的温度降低高达45 K。YSZ和金属叶片的反射率对温度分布有显著影响。此外，YSZ的吸收和散射系数，涂层的厚度，以及YSZ和金属刀片的导热系数影响温度分布。
Thermal barrier coatings are generally designed to possess very low thermal conductivity to reduce the conduction heat transfer from the coating surface to the metal turbine blade beneath the coating. In high-temperature power generation systems, however, a considerable amount of radiative heat is produced during the combustion of fuels. This radiative heat can propagate through the coating and heat up the metal blade, and thereby reduce the effectiveness of the coating in lowering the thermal load on the blade. Therefore, radiative properties are essential parameters to design radiative barrier coatings. This article presents a combined radiation and conduction heat transfer model for the steady-state temperature distribution in semitransparent yttria-stabilized zirconia (YSZ) coatings. The results of the model show a temperature reduction up to 45 K for YSZ of high reflectance (80%) compared to the YSZ of low reflectance (20%). The reflectivities of YSZ and metal blade affect the temperature distribution significantly. Additionally, the absorption and scattering coefficients of YSZ, the thickness of the coating, and the thermal conductivities of YSZ and metal blade affect the temperature distribution.