Laminated cooling coupled by surface thermal barrier coating (TBC) has a large potential to provide the effective protection to components in next-generation gas turbines. However, the conjugate heat transfer characteristics of coupling system is reported rarely. In this work, the combined effects of internal element layout, coating thickness and cooling air amount on the metal and TBC surface temperatures were discussed. The conjugate heat transfer experiments were conducted under engine-similar hot-side Biot (Bi) numbers and mainstream-to-coolant temperature ratio, and thus, a low conductivity material was applied to simulate the actual TBC. Four TBC thicknesses could cause Bi_TBC/Bi_Metal= 1.5, 3.0, 4.5 and 6.0 in the actual operating range. The results revealed the TBCs with Bi_TBC/Bi_Metal>= 4.5 can generate a large thermal resistance to reduce the metal temperature and hence a 50% increment in metal overall cooling effectiveness. However, the dominated internal cooling was also isolated to cause an increase of exterior surface temperature of entire cooling scheme, and a significant reduction of cooling air effect. The surface temperature variations were affected by the internal layout, when adopting the TBCs with Bi_TBC/Bi_Metal<= 3.0. Relative to the coolant amount and TBC thickness, the sensitivities of cooling effectiveness with internal layout were non-significant.

通过表面热障涂层（TBC）进行的分层冷却具有很大的潜力，可以为下一代燃气轮机的组件提供有效的保护。但是，偶合系统的共轭传热特性很少报道。在这项工作中，讨论了内部元素布局，涂层厚度和冷却空气量对金属和TBC表面温度的综合影响。共轭传热实验是在发动机相似的热侧比奥（Bi）数和主流与冷却剂温度比的条件下进行的，因此，采用低电导率材料来模拟实际的TBC。四种TBC厚度可能会导致在实际工作范围内，Bi _TBC / Bi _Metal = 1.5、3.0、4.5和6.0。结果揭示了TBC s的毕_TBC /铋_金属> = 4.5可以产生大的热阻，以减少在金属整体冷却效率的金属温度，因此50％的增量。然而，主要的内部冷却也被隔离，从而导致整个冷却方案的外表面温度升高，并且显着降低了冷却空气的影响。的表面温度的变化被受内部布局，采用当TBC s的毕_TBC /双_金属<= 3.0。相对于冷却剂量和TBC厚度，内部布局对冷却效率的敏感性不显着。