Abstract
The adiabatic film effectiveness η of the counter-inclined film-holes fed by varying internal coolant intake on the turbine vane leading edge model was experimentally investigated. A semi-cylinder model was adopted to model the vane leading edge which was arranged with two-row holes, which located at ±15° on both sides. The four Leading edge model with the combinations of hole-shape (simple holes and laid-back holes) and intake structure (plenum and impingement) were tested under four blowing ratios M of 0.5, 1.0, 1.5, and 2.0. The η contours were obtained by the transient measurement technique based on double thermochromic liquid-crystals. The results present that the η is sensitive to the M for the four studied leading edge cases. The addition of impingement enhances the η for the two studied holes. The film jets make the coolant-flow closed to the target surface, resulting in higher η under lower M. The core with higher η appears in the downstream area of hole-exit. The η enhancement can be provided to almost the identical level by adding the impingement-holes and improving the hole-exit shaping in most areas. With increasing M, the jets with stronger exit normal momentum penetrate into the main-flow. The impingement addition may be a more effective program to upgrade the η relatively to the exit shaping under larger M. Besides, the laid-back holes with impingement case produce the highest film cooling performance among the four cases, providing great potential in the leading edge especially under larger M.
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Acknowledgment
The authors gratefully acknowledge the support of the National Natural Science Foundation of China (Grant No. 51776173), the Innovation Capacity Support Plan in Shaanxi Province of China (Grant No. 2019KJXX-065), the Scientific Research Plan Project of Key Laboratory of Shaanxi Provincial Education Department (Grant No. 17JS070), and the Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University (Grant No. CX201913).
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Ye, L., Liu, C., Xu, Z. et al. Experimental Investigation on the Adiabatic Film Effectiveness for Counter-Inclined Simple and Laid-Back Film-Holes of Leading Edge. J. Therm. Sci. 29, 772–783 (2020). https://doi.org/10.1007/s11630-020-1287-1
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DOI: https://doi.org/10.1007/s11630-020-1287-1