Experimental investigation has been performed to study the film cooling characteristics of counter-inclined structures on the turbine vane leading edge. In this paper, four counter-inclined models are measured including cylindrical film holes with and without impingement holes, laid-back film holes with and without impingement holes. A semi-cylinder model is used to model the turbine vane leading edge. Two rows of film holes are located at ±15° on either side of the leading edge model, inclined 90° to the flow direction and 45° to the spanwise direction. Film cooling effectiveness and heat transfer coefficient have been obtained using a transient heat transfer measurement technique with double thermochromic liquid crystals with four blowing ratios ranging from 0.5 to 2 at a 1.0 density ratio. The results show that the film cooling effectiveness decreases with the increase of blowing ratio. No matter cylindrical hole or laid-back hole, the addition of impingement enhances the film cooling effectiveness. Compared with cylindrical hole, laid-back hole produces a better film cooling performance mainly because of stronger lateral momentum. Moreover, the benefits of both adding impingement and exit shaping are more obvious under a large blowing ratio.
Investigation on the Leading Edge Film Cooling of Counter-Inclined Cylindrical and Laid-Back Holes With and Without Impingement: Part I — Film Cooling Effectiveness
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Guo, Q, Liu, C, Zhu, H, Liu, H, Wang, R, & Gao, C. "Investigation on the Leading Edge Film Cooling of Counter-Inclined Cylindrical and Laid-Back Holes With and Without Impingement: Part I — Film Cooling Effectiveness." Proceedings of the ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. Volume 5C: Heat Transfer. Oslo, Norway. June 11–15, 2018. V05CT19A020. ASME. https://doi.org/10.1115/GT2018-76061
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