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首页> 外文期刊>Journal of Heat Transfer >Film Cooling and Heat Transfer on Two Cutback Trailing Edge Models With Internal Perforated Blockages
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Film Cooling and Heat Transfer on Two Cutback Trailing Edge Models With Internal Perforated Blockages

机译：两种带内部穿孔堵塞的后缘模型的薄膜冷却和传热

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Experiments to study heat transfer and film cooling on the cutback trailing edge of a turbine blade with slot ejection were performed. Heat transfer from two rows of perforated blockage inserts for lateral impingement on the coolant channel walls prior to coolant ejection into the freestream was also investigated. The internal test geometry is similar to the crossover impingement hole design used in modern gas turbine blades for trailing edge cooling. A liquid crystal technique based on hue value detection was used to measure the heat transfer coefficient on a trailing edge film-cooling model with slot ejection and an internal model with perforated blockage inserts. It was also used to determine the film effectiveness on the cutback trailing edge. For the internal model with the perforated blockage inserts, Reynolds numbers based on the hydraulic diameter of the slot and exit velocity were 5000, 10,000, 20,000, and 30,000 and corresponding coolant-to-freestream velocity ratios ranged from 0.26 to 1.83 for the external model with slot ejection, respectively. The experiments were performed for two different designs, 1 and 2, with Design 1 incorporating two different configurations with a staggered/inline slot exit arrangement and Design 2 with a staggered slot exit arrangement. Both designs utilized a 90 deg flow turn into the blockage inserts as an entrance to the test section to simulate a realistic blade passage design. Results show that the internal design geometry of the trailing edge and Reynolds numbers can affect heat transfer in an internal model with perforated blockage inserts. Design 2 with a wider entrance channel and a sloped land near the ejection slots provided low heat transfer coefficients in the internal as well as external model but gave higher film-cooling effectiveness from slot ejection.
机译：进行了实验，以研究带有狭缝喷射的涡轮叶片后缘的传热和薄膜冷却。还研究了从两排穿孔的堵塞插入物传出的热量，以便在冷却剂喷射到自由流之前横向撞击在冷却剂通道壁上。内部测试几何形状类似于现代燃气涡轮叶片中用于后缘冷却的跨接冲击孔设计。使用基于色相值检测的液晶技术在带有缝隙喷射的后缘薄膜冷却模型和带有穿孔阻塞插件的内部模型上测量传热系数。它也可用于确定切边后沿的胶片效果。对于带有穿孔堵塞插件的内部模型，基于槽的水力直径和出口速度的雷诺数分别为5000、10,000、20,000和30,000，外部模型的相应的冷却剂与自由流速度比范围为0.26至1.83插槽弹出。实验是针对两种不同的设计1和2进行的，其中Design 1包含两种具有交错/直列插槽出口布置的不同配置，而Design 2具有交错的插槽出口布置。两种设计都利用进入塞子的90度旋流作为测试部分的入口，以模拟逼真的叶片通道设计。结果表明，后缘的内部设计几何形状和雷诺数会影响带有多孔堵塞插件的内部模型中的传热。设计2具有更宽的入口通道和靠近喷射槽的倾斜平台，在内部和外部模型中提供的传热系数都较低，但从槽喷射中获得更高的薄膜冷却效率。

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