Performance of film cooling under blockage has been extensively studied on flat plates. However, the ideal film cooling patterns obtained from flat plates may not be directly applicable to realistic engineering applications involving curved vanes or surfaces. The pressure gradient on a curved surface can significantly alter the behavior and trajectory of the coolant jet. This can result in variations in film cooling effectiveness and heat transfer characteristics compared to flat plate configurations. Therefore, in this study, a conjugate heat transfer numerical simulation was performed on the C3X vane under three sorts of cooling hole blockages including all-round blockage (RB), leading-edge blockage (LB), and trailing edge blockage (TB) with blockage ratio of 0.2, 0.35 and 0.5, respectively. Results show that RB changes the cooling effectiveness in the mid-span section nonlinearly, the cooling effectiveness was decreased by (0.019, 0.023, 0.038). LB is found beneficial to local film cooling downstream the cooling hole near the mid-span and tip area of a vane at blockage ratio of 0.2 with an increment of 0.021 in the mid-span section and 0.013 in 86% span section. As the blockage ratio increases to 0.35 and 0.5, LB produces adverse influences and the mid-span cooling effectiveness was decreased by 0.013 and 0.043, respectively. TB riseed the cooling hole outlet temperature marginally. The cooling effectiveness near the hole outlet in the mid-span section was decreased by (0.020, 0.034, 0.024). However, under blockage ratio of 0.2 and 0.35, the coolant jet is found to reattach the vane surface, resulting in improved film cooling effectiveness.

中文翻译：

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具有各种冷却孔堵塞情况的 C3X 叶片压力侧的流动和传热

堵塞情况下的气膜冷却性能已在平板上进行了广泛的研究。然而，从平板获得的理想气膜冷却模式可能无法直接适用于涉及弯曲叶片或表面的实际工程应用。弯曲表面上的压力梯度可以显着改变冷却剂射流的行为和轨迹。与平板配置相比，这可能会导致薄膜冷却效率和传热特性发生变化。因此，本研究对C3X叶片在全方位堵塞（RB）、前缘堵塞（LB）和后缘堵塞（TB）三种冷却孔堵塞情况下进行了共轭传热数值模拟，计算结果如下：阻塞比分别为0.2、0.35和0.5。结果表明，RB对跨中截面的冷却效果产生非线性变化，冷却效果降低了(0.019,0.023,0.038)。研究发现，在阻塞比为 0.2 时，LB 有利于叶片中跨和尖端区域附近冷却孔下游的局部薄膜冷却，其中跨中部分增量为 0.021，86% 跨段增量为 0.013。当堵塞率增加到0.35和0.5时，LB产生不利影响，跨中冷却效率分别下降0.013和0.043。 TB 略微提高了冷却孔出口温度。跨中断面孔出口附近的冷却效果降低了(0.020,0.034,0.024)。然而，在阻塞比为 0.2 和 0.35 时，冷却剂射流被发现会重新附着在叶片表面，从而提高了气膜冷却效率。