This study aims to evaluate the heat transfer performance of different pin fins under stationary and rotating conditions. Three kinds of pin fins (upright, curved and inclined) and two included angles (45° and 60°) between the pin fins and endwalls are studied for Ro varying from 0 to 0.5. Under stationary condition, curved pin fins and inclined pin fins are characterized with much lower friction factors. Among all the pin fins studied, the thermal performance factors of 45° curved pin fins and 45° inclined pin fins show significant improvement by 12.9% and 13.9% compared to upright pin fins, respectively. Jet-like flow, generated behind the curved pin fins and inclined pin fins, can enhance local heat transfer dramatically after impinging on the endwall. Under rotating condition, heat transfer enhancement of curved pin fins show much lower sensitivity to rotation speed compared to other two pin fins. A strong pressure gradient is established close to pin fin trailing edge due to rotation, and longitudinal secondary flow behind the pin fins is induced consequently. The moving direction and strength balance between the jet-like flow and longitudinal secondary flow play crucial roles on the heat transfer.

本研究旨在评估不同针翅在静止和旋转条件下的传热性能。研究了三种针翅（直立、弯曲和倾斜）和针翅与端壁之间的两种夹角（45°和60°），Ro从0变化到0.5。在静止状态下，弯曲的销翅片和倾斜的销翅片的特点是摩擦系数低得多。在研究的所有针翅中，与直立针翅相比，45°弯曲针翅和 45°倾斜针翅的热性能因素分别显着提高了 12.9% 和 13.9%。在弯曲的销翅片和倾斜的销翅片后面产生的射流状流在撞击端壁后可以显着增强局部热传递。在旋转条件下，与其他两个销翅片相比，弯曲销翅片的传热增强对转速的敏感性要低得多。由于旋转，在针翅后缘附近建立了一个强大的压力梯度，从而在针翅后面诱导了纵向二次流。射流和纵向二次流之间的运动方向和强度平衡对传热起着至关重要的作用。