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首页> 外文期刊>International Journal of Heat and Mass Transfer >Analysis of film cooling performance of advanced tripod hole geometries with and without manufacturing features
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Analysis of film cooling performance of advanced tripod hole geometries with and without manufacturing features

机译：分析具有和不具有制造特征的先进三脚架孔几何形状的薄膜冷却性能

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摘要

The present study evaluates the film cooling performance of a set of manufacturable tripod hole designs, with and without shaped exits. The tripod holes with realistic manufacturing features included rounded corners at the hole inlet and outlet, as well as a webbing between the tripod holes. Standard cylindrical and shaped cylindrical (10° fan + laidback) holes were also studied for comparative analysis. Transient heat transfer experiments with a mainstream Re_d≈ 3200 were conducted on a flat plate test rig. Different hole geometries were tested at equal mass flow rates, corresponding to a range of blowing ratios equal to 0.5,1.0, and 2.0 for the cylindrical hole. IR (Infrared) thermography was used to evaluate adia-batic film cooling effectiveness, heat transfer coefficient, and the normalized heat flux on the flat surface. Results showed that the presence of rounded corners or webbing did not lower the performance of the tripod cooling holes. Both tripod hole geometries, with and without manufacturing features, yielded higher film cooling effectiveness compared to the cylindrical holes and slightly higher effectiveness than the shaped holes, while consuming 50% less coolant when operating at the same blowing ratio. The heat transfer coefficient measurements and the overall heat flux ratios further corroborated the thermal advantages of the tripod hole design over traditional cylindrical and shaped holes.
机译：本研究评估了一组可制造的三脚架孔设计的薄膜冷却性能，该设计具有和不具有成形的出口。具有逼真的制造特征的三脚架孔包括孔入口和出口处的圆角，以及三脚架孔之间的织带。还研究了标准的圆柱孔和异型圆柱孔（10°扇形+后退），以进行比较分析。在平板试验台上进行了主流Re_d≈3200的瞬态传热实验。在相等的质量流量下测试了不同的孔几何形状，对应于圆柱形孔的吹塑比范围等于0.5、1.0和2.0。红外（红外）热像仪用于评估绝热膜的冷却效果，传热系数和平坦表面上的归一化热通量。结果表明，圆角或织带的存在不会降低三脚架冷却孔的性能。具有和不具有制造特征的两个三脚架孔几何形状都比圆柱形孔具有更高的薄膜冷却效率，并且比异形孔具有更高的效率，而在相同的吹气比下运行时，冷却剂的消耗减少了50％。传热系数的测量结果和总体热通量比进一步证实了三脚架孔设计相对于传统的圆柱形和异形孔的热优势。

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