Analysis of thermal radiation effects on temperatures in turbine engine thermal barrier coatings
Analysis of thermal radiation effects on temperatures in turbine engine thermal barrier coatings
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DOI：
10.1016/s0921-5093(97)00845-9
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发表时间：
1998-05
期刊：
影响因子：
6.4
通讯作者：
R. Siegel;C. M. Spuckler
中科院分区：
文献类型：
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作者：
R. Siegel;C. M. Spuckler
燃烧室衬里、涡轮叶片和旋转叶片上的热障涂层对于降低当前和先进涡轮发动机的金属温度具有重要意义。一些涂层材料，如氧化锆，对热辐射是部分透明的，对于效率更高的发动机，随着温度的升高，涂层内的辐射会增加。因此，有必要确定涂层中的辐射效应是否是设计考虑因素。为此，首先就影响辐射换热的因素对发动机热环境进行了总结。然后讨论了氧化锆的辐射和热性质，并简要讨论了辐射分析的方法。通过对叶片、旋转叶片和燃烧室衬里表面可能被烟尘覆盖的氧化锆热障涂层的分析，给出了典型的温度分布和热流密度。研究了不同的热条件和热传递参数的影响，以表明在涡轮发动机涂层内辐射效应可能是显著的。在涂层受到较大入射辐射的燃烧室中，影响最大。对于远离燃烧室的涡轮叶片上的涂层，因此没有大的入射辐射，辐射的影响被发现非常小。
Thermal barrier coatings on combustor liners and on turbine vanes and rotating blades are important for reducing metal temperatures in current and advanced turbine engines. Some coating materials such as zirconia are partially transparent to thermal radiation, and radiation within a coating will increase as temperatures are raised for higher efficiency engines. Hence, it is necessary to determine if radiation effects in a coating are a design consideration. For this purpose, the engine thermal environment is first summarized with regard to factors affecting radiative heat transfer. Radiative and thermal properties of zirconia are then considered, and methods of radiative analysis are briefly discussed. Typical temperature distributions and heat fluxes are given from the analysis of zirconia thermal barrier coatings on vanes and rotating blades, and on a combustor liner where the coating surface is expected to be covered with soot. The effects of various thermal conditions and heat transfer parameters are examined to indicate when radiation effects might be significant within a coating in a turbine engine. The largest effects were found in the combustor where coatings are subjected to large incident radiation. For coatings on turbine blades away from the combustor, and hence without large incident radiation, effects of radiation were found to be very small.