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contributor authorHu, Jia-Jun
contributor authorAn, Bai-Tao
date accessioned2023-11-29T19:45:37Z
date available2023-11-29T19:45:37Z
date copyright8/16/2023 12:00:00 AM
date issued8/16/2023 12:00:00 AM
date issued2023-08-16
identifier issn0889-504X
identifier otherturbo_145_10_101007.pdf
identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4295010
description abstractThis paper investigated the film-cooling effectiveness of diffusion slot holes in a turbine nozzle guide vane. The pressure-sensitive paint measurement technique was employed to obtain the film-cooling effectiveness at a density ratio of DR = 1.5. The mainstream Reynolds number based on the axial chord length and the exit velocity was 6 × 105. The mainstream turbulence intensity was approximately 3.7%. Three diffusion slot hole geometries with cross-sectional aspect ratios (ASs) of 2.3, 3.4, and 4.9 were tested and compared with a typical fan-shaped hole. The experiments were performed at three typical hole row locations on the pressure surface (PS) and suction surface (SS). The average blowing ratios varied from M = 0.5 to 2.5. The results showed that throughout the blowing ratio range, on the PS, a substantially higher film-cooling effectiveness than the fan-shaped hole is always obtained from the diffusion slot hole with a large aspect ratio (AS = 4.9); on the SS, the diffusion slot hole with a small AS (AS = 2.3). The influence of hole row positioning is inconsistent for diffusion slot holes with different ASs. The diffusion slot hole is less affected by the PS when the AS is moderate and less affected by the SS when the AS is large. The film-cooling effectiveness of the diffusion slot holes is basically the lowest where the PS has a maximum concave curvature and the highest where the SS has a large favorable pressure gradient.
publisherThe American Society of Mechanical Engineers (ASME)
titleFilm Cooling Effectiveness on Pressure Surface and Suction Surface of Turbine Guide Vane With Diffusion Slot Holes
typeJournal Paper
journal volume145
journal issue10
journal titleJournal of Turbomachinery
identifier doi10.1115/1.4062805
journal fristpage101007-1
journal lastpage101007-14
page14
treeJournal of Turbomachinery:;2023:;volume( 145 ):;issue: 010
contenttypeFulltext


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