Impingement cooling is an important turbine blades cooling technique, but it is often not as efficient as required due to the deflection of downstream jets caused by crossflow. In this paper, a novel corrugated target surface is proposed to convert downstream oblique impingement into orthogonal impingement for higher heat transfer. To prove this design, the flow and heat transfer characteristics of impingement cooling with conventional flat target surface (Baseline case), full-corrugated (FC) target surface, and semi-corrugated (SC) target surface are compared over the jet Reynolds number ranging from 15,000 to 45,000. Results show that the Nusselt number of full-corrugated target surface is almost the same as that of flat target surface at the region corresponding to the first five jets, but its peak value and uniformity are significantly improved at the region corresponding to the last four jets, especially under high jet Reynolds numbers. In addition, with the increase of corrugation depth (H), the total heat transfer capacity and area-averaged Nusselt number increase, but this comes at the cost of increased friction loss. Comprehensively evaluating heat transfer and friction loss, only the FC with H = 0.8D case always has better thermal performance than Baseline case under all computed conditions, and the maximum improvement can reach 5.8%. Last but not least, the SC with H = 0.8D case is proposed based on the FC with H = 0.8D case to further reduce the friction loss, and results show that its thermal performance is improved significantly due to the decreased friction loss and almost unchanged heat transfer.

冲击冷却是一种重要的涡轮叶片冷却技术，但由于横流引起下游射流偏转，它通常不如所需的高效。在本文中，提出了一种新型波纹靶面，将下游斜向冲击转化为正交冲击，以实现更高的传热。为了证明这种设计，在射流雷诺数范围内比较了具有传统平坦目标表面（基线情况）、全波纹 (FC) 目标表面和半波纹 (SC) 目标表面的冲击冷却的流动和传热特性从 15,000 到 45,000。结果表明，在前五次射流对应的区域，全波纹靶面的努塞尔数与平坦靶面的努塞尔数几乎相同，但其峰值和均匀性在后四次射流对应的区域有显着提高，特别是在高射流雷诺数下。此外，随着波纹深度的增加（H )，总传热能力和面积平均努塞尔数增加，但这是以增加摩擦损失为代价的。综合评估传热和摩擦损失，在所有计算条件下，只有H  = 0.8 D情况下的 FC始终比 Baseline 情况具有更好的热性能，并且最大改进可以达到 5.8%。最后但并非最不重要的，与SC ħ  = 0.8 d情况下，基于与该FC提出ħ  = 0.8 d情况下以进一步降低摩擦损失，结果表明，由于减小的摩擦损耗和几乎在其散热性能得到显著改善热传递不变。