Film cooling technique is one of the gas turbine components saving from thermal failure. This article presents a numerical study of film cooling effectiveness due to two rows of simple and compound angle holes. The holes are inclined with 30° on a flat surface for all studied cases. Two orientation angles of the film cooling holes are applied (0° and 30°). Six cases are used to represent different configurations for the two rows. Three different values of velocity ratios (namely 0.5, 1.0 and 2.0) are represented during this study. The numerical model is validated through comparing the results of single row with simple holes with the available experimental works in the literature. As an interesting observation, it is found that the staggered arrangement provides better film cooling effectiveness than the in-line one for zero orientation angle configurations, while the in-line arrangement represents the highest effectiveness if all holes in the two rows have 30° orientation angle. The enhancement ratio of overall effectiveness corresponding to averaged film cooling has been calculated. The maximum enhancement ratio has been achieved with compound/compound in-line configuration with about 336.5% at velocity ratio equal 2. Using compound angle holes enhances the film cooling effectiveness with inline arrangement, while using it with staggered arrangement reduces the overall averaged film cooling effectiveness, especially at high velocity ratio.

薄膜冷却技术是避免因热故障而节省的燃气轮机组件之一。本文对由于两排简单和复合角孔而产生的薄膜冷却效果进行了数值研究。对于所有研究的案例，孔在平面上倾斜30°。施加两个薄膜冷却孔的定向角（0°和30°）。六个案例用于代表两行的不同配置。在这项研究中代表了三种不同的速度比值（分别为0.5、1.0和2.0）。通过将单行带简单孔的结果与文献中可用的实验工作进行比较，验证了数值模型的有效性。作为一个有趣的观察，已经发现，对于零取向角构造，交错布置比直列布置提供了更好的膜冷却效果，而如果两排中的所有孔都具有30°取向角，则直列布置表示最高的效率。已经计算出与平均薄膜冷却相对应的总体有效性的提高率。化合物/化合物串联配置在速度比等于2时达到了约336.5％，实现了最大增强比。使用化合物角孔可以通过串联布置提高薄膜冷却效率，而采用交错布置则可以降低整体平均薄膜冷却效果，特别是在高速比时。而如果两排中的所有孔都具有30°的定向角，则直列式排列方式的效率最高。已经计算出与平均薄膜冷却相对应的总体有效性的提高率。化合物/化合物串联配置在速度比等于2时达到了约336.5％，实现了最大增强比。使用化合物角孔可以通过串联布置提高薄膜冷却效率，而采用交错布置则可以降低整体平均薄膜冷却效果，特别是在高速比时。而如果两排中的所有孔都具有30°的定向角，则直列式排列方式的效率最高。已经计算出与平均薄膜冷却相对应的总体有效性的提高率。化合物/化合物串联配置在速度比等于2时达到了约336.5％，实现了最大增强比。使用化合物角孔可以通过串联布置提高薄膜冷却效率，而采用交错布置则可以降低整体平均薄膜冷却效果，特别是在高速比时。