In this paper, the internal cooling structure of a second-stage rotor blade is designed by using a multi-level highly efficient design platform. The design process is divided into schematic design and detailed design in sequence. The calculations of pipe-network and heat conduction are presented to preliminary evaluate the cooling structures derived from the schematic design stage. The flow field and heat transfer characteristics of the revised cooling structures are analyzed in the detailed design by using the three-dimensional conjugated heat transfer calculation method. Topological structure, mass flow rate, pressure distribution, heat transfer coefficient and temperature distribution of the cooling channels are presented. It is found that the schematic design results based on one-dimensional to three-dimensional solution method are in good agreement with the detailed design results. Meanwile, the introduction of the schematic design is helpful to shorten the cooling design cycle and reduce the dependence of the design experience. In this work, a five-pass serpentine passage with single cooling air inlet in the cooling system may lead to low flow rate at the trailing edge, which is prone to cause hot gas back-flow and local high heat load. The cooling system with a right-angle channel and a three-pass serpentine channel helps to distribute the flow reasonably and reduce the thermal gradient on the blade surface. The optimal cooling structure meet the requirements well. Compared with the uncooled blade, the average temperature of the blade decrease over 530 K with limited cooling air.

本文采用多层高效设计平台设计了二级转子叶片的内部冷却结构。设计过程按顺序分为原理图设计和详细设计。提出了管网和热传导的计算，以初步评估从方案设计阶段得出的冷却结构。采用三维共轭传热计算方法，对修正后的冷却结构的流场和传热特性进行了详细设计。给出了冷却通道的拓扑结构，质量流量，压力分布，传热系数和温度分布。结果表明，基于一维到三维求解方法的原理图设计结果与详细的设计结果吻合良好。同时，原理图设计的引入有助于缩短冷却设计周期并减少对设计经验的依赖。在这项工作中，冷却系统中具有单个冷却空气入口的五通蛇形通道可能会导致后缘的流速较低，这容易导致热气回流和局部高热负荷。具有直角通道和三通道蛇形通道的冷却系统有助于合理地分配流量并减少叶片表面的热梯度。最佳的冷却结构可以很好地满足要求。与未冷却的刀片相比，