Entropy generation is employed to quantify second law losses, and aerodynamic gains, which are associated with a film cooled boundary layer produced by a unique full-coverage compound angle hole configuration. With this arrangement, an alternating sign for the compound angle β is employed from one streamwise row of holes to another, such that compound angle β is + 30⁰ in one row of holes, followed by − 30⁰ in the next row of holes. Results from this arrangement are compared to simple angle arrangement with β = 0⁰. Determined from isothermal flow field measurements of local total pressure variations from film cooling, are the entropy change, entropy generation, and mass-averaged overall exergy destruction, relative to the freestream flow outside of the boundary layer. Because stagnation pressure values, associated with film cooling in the boundary layer, are higher than freestream stagnation pressure values, the present film arrangements and conditions produce aerodynamic gains relative to the freestream flow. Film cooling blowing ratio values range from 2.9 to 6.0, and mainstream Reynolds numbers range from 89 000 to 141 000. Entropy generation and exergy destruction are compared for the compound and simple angle full-coverage film cooling arrangements. Variations of these quantities are evident with boundary layer location, and as the blowing ratio, streamwise development location, and main flow Reynolds number vary. Differences for the two film cooling configurations, as these parameters vary, are a consequence of significantly different film cooling behavior and characteristics, as related to entropy generation and exergy destruction distributions.

熵生成用于量化第二定律损失和空气动力增益，这些损失与由独特的全覆盖复合角孔配置产生的薄膜冷却边界层相关。使用这种布置，复合角β的交替符号从一排孔流向另一排被采用，使得在一排孔中复合角β为+ 30 ⁰，随后在下一排孔中为- 30 ⁰。将这种布置的结果与 β = 0 ^{0 的}简单角度布置进行比较. 由薄膜冷却引起的局部总压力变化的等温流场测量确定的是熵变、熵产生和质量平均的整体火用破坏，相对于边界层外的自由流流动。因为与边界层中的薄膜冷却相关的滞止压力值高于自由流滞止压力值，所以当前的薄膜布置和条件产生相对于自由流流动的空气动力学增益。薄膜冷却吹气比值范围为 2.9 至 6.0，主流雷诺数范围为 89 000 至 141 000。比较了复合和简单角度全覆盖薄膜冷却装置的熵产生和火用破坏。这些量的变化随着边界层的位置而明显变化，并且随着吹塑比，流向发展位置，与主流雷诺数不同。由于这些参数不同，两种薄膜冷却配置的差异是显着不同的薄膜冷却行为和特性的结果，与熵产生和火用破坏分布有关。