A numerical study was carried out to explore the influence of triangular with concave edge shaped (TCES) upstream ramp on the film cooling effectiveness (FCE) and flow characteristics. The main objective of this study is to obtain the performance of the newly proposed upstream ramp on FCE and to establish that it provides better thermal protection by increasing the lateral diffusion of coolant on the surface compared to the baseline case and continuous triangular-shaped (TS) upstream ramp. Four different cases were investigated, including baseline case, TCES with s/d = 1, TCES with s/d = 1.5 and triangular-shaped (TS) upstream ramp. Coolant streams were injected through a circular jet hole on the target surface with an inclination angle of α_c = 35˚. Computations were carried out with different blowing ratio (M), including, 0.40, 0.85, 1.00, and 1.25. Results showed that TCES has a significant potential of improving coolant dispersion towards the lateral direction on the surface by means of generating a pair of strong anti-counter rotating vortex (anti-CRV) in the jet flow region compared to the baseline case. Correspondingly TCES with s/d = 1 upstream ramp is the best design especially considering thermal protection. Moreover, area-averaged FCE enhances 441.35% by using TCES with s/d = 1 upstream ramp on the surface under inspection compared with the baseline case for the blowing ratio of M = 1.25.

进行了数值研究，以探索具有凹边形状的三角形（TCES）上游斜面对薄膜冷却效率（FCE）和流动特性的影响。这项研究的主要目的是获得新提议的FCE上游斜坡的性能，并通过与基线情况和连续三角形（TS）相比增加表面上的冷却剂横向扩散来提供更好的热保护。 ）上游坡道。研究了四种不同的情况，包括基线情况，s / d = 1的TCES，s / d = 1.5的TCES和三角形（TS）上游斜坡。冷却剂流是通过一圆形喷射孔喷射在目标表面上与α的倾斜角_Ç =35˚。以不同的吹塑比（M）进行计算，包括0.40、0.85、1.00和1.25。结果表明，与基线情况相比，通过在喷射流区域产生一对强烈的抗逆旋转涡流（anti-CRV），TCES具有改善冷却剂在表面上横向扩散的巨大潜力。相应地，s / d = 1上游斜坡的TCES是最佳设计，尤其是考虑到热保护时。此外，与M = 1.25的鼓风比的基准情况相比，在受检表面上使用s / d = 1上游斜面的TCES，面积平均FCE提高了411.35％。