Combing the advantages of film cooling, impingement cooling, and enhanced cooling by pin fins, laminated cooling is attracting more and more attention. This study investigates the effects of geometric and thermodynamic parameters on overall cooling effectiveness of laminated configuration, and model experiments were carried out to validate the numerical results. It is found that the increases in film cooling hole diameter and pin fin diameter both result in the increase in cooling effectiveness, but the increases in impingement hole diameter, impingement height, and spanwise hole pitch degrade the cooling performance. The increase of the coolant flow rate causes the increase in cooling efficiency, but this effect becomes weaker at a high coolant flow rate. The coolant-to-mainstream density ratio has no obvious effect on cooling effectiveness but affects wall temperature obviously. Moreover, based on the numerical results, an empirical correlation is developed to predict the overall cooling efficiency in a specific range, and a genetic algorithm is applied to determine the empirical parameters. Compared with the numerical results, the mean prediction error (relative value) of the correlation can reach 8.3%.

中文翻译：

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层状冷却配置的参数研究：整体冷却效率

结合薄膜冷却，冲击冷却和针状散热片增强冷却的优点，层压冷却越来越受到关注。这项研究调查了几何和热力学参数对层压结构整体冷却效果的影响，并进行了模型实验以验证数值结果。发现膜冷却孔直径和销翅片直径的增加都导致冷却效率的提高，但是冲击孔直径，冲击高度和翼展方向孔距的增加降低了冷却性能。冷却剂流量的增加导致冷却效率的提高，但是在高冷却剂流量时该效果变弱。冷却剂与主流的密度比对冷却效率没有明显影响，但对壁温的影响却明显。此外，基于数值结果，建立了经验相关性以预测特定范围内的总体冷却效率，并应用遗传算法确定经验参数。与数值结果相比，相关性的平均预测误差（相对值）可以达到8.3％。