Film Cooling Effectiveness Measurements With Periodic Unsteady Inflow on Highly Loaded Blades With Main Flow Separation
Film Cooling Effectiveness Measurements With Periodic Unsteady Inflow on Highly Loaded Blades With Main Flow Separation
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DOI：
10.1115/1.4000568
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发表时间：
2011-04
影响因子：
1.7
通讯作者：
R. Gomes;R. Niehuis
中科院分区：
文献类型：
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作者：
R. Gomes;R. Niehuis
在高负荷高压涡轮机叶片的直线叶栅上进行了气膜冷却实验。在压力面上有一个较大的主流分离区域，在该区域内有三排圆柱形或扇形孔提供气膜冷却。测量包括绝热气膜冷却效率和剖面静压测量。利用热色液晶和色调温度相关性获得表面温度。所示的结果是在发动机相关水平和冷却剂质量流量的主流马赫数和雷诺数的变化。在平行于叶栅的平面内向上游移动的圆柱形棒产生的高湍流尾流的稳定和周期性非定常来流的结果作为二维表面图、横向平均气膜冷却效率和整个表面的整体效率进行比较。
Film cooling experiments were performed using a highly loaded high pressure turbine blade blade linear cascade. A large region with main flow separation is found on the pressure side and film cooling is provided into this area with three rows of either cylindrical or fan-shaped holes. The measurements comprise adiabatic film cooling effectiveness and profile static pressure measurements. The surface temperature was acquired with thermochromatic liquid crystals and using a hue to temperature correlation. The results shown are for variations in main flow Mach and Reynolds numbers at engine relevant levels and of coolant mass flows. The results for steady and periodic unsteady inflows with highly turbulent wakes created by cylindrical bars moving upstream in a plane parallel to the cascade are compared as two-dimensional surface plots, laterally averaged film cooling effectiveness and overall effectiveness over the entire surface.