带倾斜膜孔的多腔尖端薄膜冷却特性的实验和数值评估

0 ENGINEERING, MECHANICAL
Zhe Jia, Feng Li, Weixin Zhang, Zhao Liu, Zhenping Feng
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引用次数: 0

摘要

由于涡轮叶尖上存在复杂的流场和巨大的热负荷,薄膜冷却对保护叶尖不被过热至关重要。本文通过实验比较了四种叶尖结构(腔数分别为 1、2、3 和 4)和两种膜孔结构(垂直于腔底和与腔底倾斜 45 度)在三种冷却剂喷射比下的膜冷却分布。通过压敏涂料技术,测量了薄膜冷却效果的分布。此外,还进行了仔细的验证计算,以获得尖端区域的冷却轨迹,并比较这些多腔尖端的空气动力性能。结果表明,倾斜配置提高了薄膜冷却效果的数值和均匀性。使用多腔针尖时,针尖薄膜冷却效果增强。此外,还比较了测试喷嘴的空气动力损耗。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Experimental and Numerical Evaluation of the Film Cooling Characteristics of the Multi-cavity Tip with Inclined Film Holes
Due to the complex flow field and the considerable heat load on the turbine blade tip, film cooling is essential to protect the tip from being overheated. In this paper, an experimental work was conducted to compare the film cooling distributions of four tip structures (cavity numbers are one, two, three, and four) with two film hole configurations (perpendicular and 45 degrees inclined to the cavity floor) under three coolant blowing ratios. By using pressure sensitive paint technique, the distributions of film cooling effectiveness were measured. Moreover, a computation with careful validation was executed to obtain the cooling traces in the tip region and compare the aerodynamic performance of these multi-cavity tips. The results showed that the value and uniformity of film cooling effectiveness were improved by the inclined configuration. The tip film cooling was enhanced when using the multi-cavity tips. The aerodynamic loss of the tested tips was compared as well.
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