Abstract Flow features and film cooling performance of five configurations of double-row, cylindrical holes, upstream of an E3 vane, in a linear cascade are numerically investigated. This simulation is completed using a verified turbulence model at four blowing ratios (M = 0.5, 1.0, 1.5, 2.0). The first three configurations have two rows of cylindrical holes, each row with the same compound angle (β=-45°, 0° or 45°), while the other two have two rows with opposite compound angles (β=-45°, 45° and β=45°, -45°), which are also referred to as double-jet film cooling (DJFC) holes. The primary effects on the downstream endwall and the secondary effects on the nearby airfoil of the cooled passage are analyzed and discussed in detail. Results show that at low blowing ratios the movement of the coolant is denominated by the interaction between the jets and vortices resulting in similar film coverage on both the endwall and airfoil. The effect of vortices is reduced at high blowing ratios. It is also shown that the movement of the coolant is determined by the initial velocity direction, as well as the film cooling configuration.

中文翻译：

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上游、双排、圆柱孔对端壁流动和薄膜冷却的一次和二次影响的分析

摘要 数值研究了线性叶栅中E3叶片上游的5种双排圆柱孔结构的流动特征和气膜冷却性能。该模拟使用经过验证的湍流模型在四种吹气比 (M = 0.5、1.0、1.5、2.0) 下完成。前三种配置有两排圆柱孔，每排具有相同的复合角（β=-45°、0°或45°），而另外两种配置有两排具有相反的复合角（β=-45°、 45° 和 β=45°, -45°)，也称为双喷气膜冷却 (DJFC) 孔。对下游端壁的主要影响和对冷却通道附近翼型的次要影响进行了详细分析和讨论。结果表明，在低吹气比下，冷却剂的运动由射流和涡流之间的相互作用决定，导致端壁和翼型上的薄膜覆盖率相似。涡流的影响在高吹气比下会降低。还表明，冷却剂的运动由初始速度方向以及薄膜冷却配置决定。