Analysis of enhanced heat transfer on a turbine blade tip-wall with and without guide ribs

Gongnan Xie, Bengt Sundén, Weihong Zhang, Esa Utriainen, Lieke Wang

科研成果: 书/报告/会议事项章节会议稿件同行评审

2 引用 (Scopus)

摘要

Cooling methods are needed for gas turbine blade tips that are exposed to high temperature gas. A common way to cool the blade and its tip is to design serpentine passages with 180-deg turn under the blade tip-cap inside the turbine blade. Improved internal convective cooling is therefore required to increase the blade tip lifetime. This paper presents numerical predictions of turbulent heat transfer through two-pass channels with and without guide ribs (guide vanes) placed in the turn regions using RANS turbulence modeling. The effects of adding guide ribs on the tip-wall heat transfer enhancement and the channel pressure drop have been analyzed. The inlet Reynolds numbers are ranging from 100,000 to 600,000, and the rib cross-section blockage ratio (rib height to channel height, 2e/H) is 0.182. The detailed fluid flow and heat transfer over the tip-wall are presented. The overall performances of three two-pass channels are evaluated and compared. It is found that the tip heat transfer coefficients of the channels with guide ribs are 20%∼50% higher than that of a channel without guide ribs. The presence of guide ribs could lead to an increased (about 15%) or decreased (up to about 12%) pressure drop, depending upon the geometry and placement of guide ribs. It is suggested that the usage of guide ribs is a suitable way to improve the flow structure and augment the blade tip heat transfer, but is not the most effective way to augment tip-wall heat transfer compared to the augmentation by surface modifications imposed on the tip directly.

源语言英语
主期刊名Fluid Flow, Heat Transfer and Thermal Systems
出版商American Society of Mechanical Engineers (ASME)
1387-1394
页数8
版本PARTS A AND B
ISBN(印刷版)9780791844441
DOI
出版状态已出版 - 2010
活动ASME 2010 International Mechanical Engineering Congress and Exposition, IMECE 2010 - Vancouver, BC, 加拿大
期限: 12 11月 201018 11月 2010

出版系列

姓名ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)
编号PARTS A AND B
7

会议

会议ASME 2010 International Mechanical Engineering Congress and Exposition, IMECE 2010
国家/地区加拿大
Vancouver, BC
时期12/11/1018/11/10

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