Film-cooling hole optimization and experimental validation considering the lateral pressure gradient

IF 4.7 2区 工程技术 Q1 ENGINEERING, MECHANICAL
Hao Zhang, J. Gou, Peng Yin, Xinrong Su, Xin Yuan
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引用次数: 2

Abstract

The flow in the turbine endwall region consists of the complicated secondary flow structures driven by the lateral pressure gradient, which heavily affects the performance of film cooling. In this work, the film-cooling hole design optimization is performed considering the existence of the lateral pressure gradient in the real flow environment. Results have shown that the optimal film-cooling hole design is heavily influenced by the lateral pressure gradient in the endwall region, especially the compound angle design is clearly different from the flat plate flow environment. The optimization results are further validated with experiments using the pressure-sensitive paint (PSP) technique, and the film cooling performance is shown to be improved by 42.9%. This work demonstrates the importance of considering the real flow environment in the film-cooling hole design and also can provide guidance to the film-cooling hole design in the endwall region.
考虑侧向压力梯度的薄膜冷却孔优化及实验验证
涡轮端壁区域的流动由复杂的二次流结构组成,由侧压力梯度驱动,严重影响气膜冷却性能。在实际流动环境中,考虑侧压力梯度的存在,对气膜冷却孔进行了优化设计。结果表明:气膜冷却孔的优化设计受端壁侧压力梯度的影响较大,特别是复合角设计明显不同于平板流动环境。利用压敏涂料(PSP)技术对优化结果进行了进一步验证,结果表明,膜层冷却性能提高了42.9%。研究结果表明了考虑实际流动环境对气膜冷却孔设计的重要性,对端壁区气膜冷却孔设计具有一定的指导意义。
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来源期刊
Frontiers of Mechanical Engineering
Frontiers of Mechanical Engineering Engineering-Mechanical Engineering
CiteScore
7.20
自引率
6.70%
发文量
731
期刊介绍: Frontiers of Mechanical Engineering is an international peer-reviewed academic journal sponsored by the Ministry of Education of China. The journal seeks to provide a forum for a broad blend of high-quality academic papers in order to promote rapid communication and exchange between researchers, scientists, and engineers in the field of mechanical engineering. The journal publishes original research articles, review articles and feature articles.
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