Enhanced thermal performance of a pin-fin cooling channel for gas turbine blade by density-based topology optimization
Enhanced thermal performance of a pin-fin cooling channel for gas turbine blade by density-based topology optimization
复制标题
通过基于密度的拓扑优化增强燃气轮机叶片针翅式冷却通道的热性能
DOI：
10.1016/j.ijthermalsci.2022.107783
复制
发表时间：
2022
影响因子：
4.5
通讯作者：
H.
中科院分区：
文献类型：
--
作者：
Yeranee;K.;Rao;Y.;Li;Y.;Li;H.
针翅阵列通常用于燃气轮机叶片的后缘区域，以增强传热并增强叶片的完整性，但传统的针元件可能会导致通道中的热性能较低。先前的研究提出了不同的策略来通过经验设计来减少流动摩擦和控制对流换热，从而导致极其昂贵和耗时。这项工作利用考虑湍流的基于密度的拓扑优化来提高冷却通道的热性能，并选择压力损失最小化作为目标。结果表明，优化设计中不同元件产生的复杂流动提供了更好的温度均匀性。与相同固体体积的情况相比，在相当的端壁传热情况下，优化模型的压力损失降低了约156.7%。在这项研究中，优化模型在比较模型中显示出最高的热性能，因为它在低压损失下促进了适当的更高的传热。优化结果还表明，本工作中采用的基于密度的方法可用于优化不同的通道配置，从而最大限度地改善冷却通道。
Pin-fin arrays are commonly used in the trailing edge region of gas turbine blades to enhance heat transfer and strengthen the blade's integrity, but the traditional pin elements may cause low thermal performance in the channel. Previous studies have proposed different strategies to reduce the flow friction and control convective heat transfer by empirical designs, leading to extremely cost- and time-consuming. Density-based topology optimization considering a turbulent flow is leveraged in this work to improve the thermal performance of the cooling channel, and the pressure loss minimization is selected as the objective. The results show that complex flow generated by different elements in the optimized design provides a better temperature uniformity. Compared with the same solid volume case, the optimized model causes a lower pressure loss, by about 156.7%, at comparable endwall heat transfer. In this study, the optimized model shows the highest thermal performance among the comparative models due to promoting applicably higher heat transfer at a low-pressure loss. The optimized results also show that the density-based method leveraged in this work can be used to optimize different channel configurations, which maximize the improvement of the cooling channel.