为研究船用燃气轮机高温涡轮叶片尾缘受冷却空间布置限制而承受较高热负荷的问题。将楔形矩阵肋冷却结构应用于涡轮叶片尾缘，通过“流-固-热”耦合数值模拟，从传热特性、冷却效率及其均匀性和流动特性三大角度对比分析了不同射流配置的影响。结果表明，通过优化射流设计，“底进+侧出+顶出”的配置传热性能可提高7%至80%；此外，温度梯度引起的热应力不超过3.1%，相对温度偏差不超过8%，进一步说明了矩阵肋结构在调节冷却均匀性方面有较好的优势；同时，不同的射流设计对速度大小的分布产生了强烈的影响，纵向涡在形成高协同角的流场中起着至关重要的作用。这些发现强调了楔形矩阵肋结构耦合传热特性在涡轮叶片尾缘冷却设计中的作用，也为设计微通道换热器提供了重要指导。

In order to study the problem of the high-temperature turbine blade trailing edge of a ship gas turbine, which is subject to significant heat load due to the constraints in cooling space arrangement. The wedge-shaped latticework cooling structure is employed for the turbine blades trailing edge. Using "fluid-solid-thermal" coupled numerical simulations, the effects of different ejection configurations were analyzed from three perspectives: heat transfer behaviors, cooling efficiency, cooling uniformity and flow characteristics. The result indicates that the "bottom inlet + lateral outlet + top outlet" configuration’s heat transfer can be improved by 7% to 80% via optimizing ejection flow configuration. Besides, thermal stress caused by temperature gradient is no more than 3.1% and relative temperature deviation is no more than 8%, indicating the advantage of latticework in regulating cooling uniformity. At the same time, distribution of velocity magnitude is intensively affected by ejection flow configurations and the longitudinal vortexes play an essential role in creation of highly synergetic thermo-hydrodynamic field. These findings highlight the significance of the coupled heat transfer characteristics of the wedged latticework structures in the cooling design of turbine blade trailing edges, also provide important guidelines for designing of micro-channel heat exchangers.

TK221

国家自然科学基金项目（面上项目，重点项目，重大项目）