A numerical investigation is performed to study the serrated trenched-hole film cooling performance on the convex and the concave surfaces, with the use of a plenum coolant-fed mode. In current study, the relevant curvature of curved surface is varied as 2r₁/d = 30, 60 and 90 at the convex side, 2r₂/d = 90, 120 and 180 at the concave side. In addition, three coolant injection angles (such as θ = 30°, 35° and 45°) are considered in a specific curved channel. The blowing ratio defined in terms of the local primary flow velocity is ranged from 0.25 to 1.5. From the present study, a critical parameter (I₀), in the form of Icos²θ, is preliminarily identified to be around 0.5 for the serrated trenched-hole film cooling. When Icos²θ<I₀, the film cooling effectiveness on the convex surface is better than that on the flat surface and concave surfaces. The situation is opposite when Icos²θ>I₀. In particular, this critical value for the serrated trenched-hole film cooling is obviously less than the unity that previously identified in the cylindrical-hole film cooling situation. The relevant curvature shows nearly rare influence on the film cooling effectiveness under small blowing ratios, either on the convex surface or the concave surface. However, under high blowing ratios, it has a pronounced impact on the film cooling effectiveness, in particular at the concave side. Under M = 1.5, the area-averaged adiabatic film cooling effectiveness in the region between s/d = 10 and s/d = 20 is increased up to 33% by the smallest relevant curvature case with respect to the biggest relevant curvature case. The coolant injection angle plays an important role on the mutual interaction of jet-in-corssflow of the serrated trenched-hole film cooling. The reduction in the coolant injection angle leads to an obvious film cooling enhancement, either on the convex surface or the concave surface. Moreover, the enhancing effect led by the reduction of coolant injection angle behaves more pronouncedly as the blowing ratio increases.

进行了数值研究，以使用充气冷却剂供料模式研究凸面和凹面上的锯齿状沟槽膜的冷却性能。在当前的研究中，曲面的相关曲率在凸侧为2r ₁ / d = 30、60和90，在凹侧为2r ₂ / d = 90、120和180。此外， 在特定的弯曲通道中考虑了三个冷却剂喷射角（例如θ = 30°，35°和45°）。根据局部主要流速定义的吹风比在0.25至1.5的范围内。从本研究中，一个关键的参数（我₀），的形式我余弦² θ对于锯齿状沟槽膜冷却，初步确定，其约为0.5。当我COS ² θ <我₀，膜的凸表面上冷却效率比平坦面和凹面上更好。的情况是相反的，当我余弦² θ >余₀。特别地，用于锯齿状沟槽膜冷却的该临界值明显小于先前在圆柱孔膜冷却情况下所确定的单位。相关的曲率在凸面或凹面的小吹塑比下对薄膜冷却效率几乎没有影响。但是，在高吹塑比下，它对薄膜的冷却效果有明显的影响，特别是在凹面。在M  = 1.5时，在s / d  = 10到s / d之间的区域中，绝热膜的平均冷却效率 相对于最大相关曲率情况，最小相关曲率情况下= 20增加到33％。冷却剂喷射角在锯齿状沟槽膜冷却的射流互作用中起重要作用。冷却剂喷射角的减小导致在凸面或凹面上的明显的膜冷却增强。而且，随着喷射比的增加，由冷却剂喷射角的减小导致的增强效果表现得更加明显。