@inproceedings{e61ed73e8ca14ceb9244e7d0c5a34edd,
title = "Analysis of enhanced heat transfer on a turbine blade tip-wall with and without guide ribs",
abstract = "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.",
keywords = "Guide ribs, Heat transfer enhancement, Numerical simulation, Tip-wall",
author = "Gongnan Xie and Bengt Sund{\'e}n and Weihong Zhang and Esa Utriainen and Lieke Wang",
year = "2010",
doi = "10.1115/IMECE2010-37302",
language = "英语",
isbn = "9780791844441",
series = "ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)",
publisher = "American Society of Mechanical Engineers (ASME)",
number = "PARTS A AND B",
pages = "1387--1394",
booktitle = "Fluid Flow, Heat Transfer and Thermal Systems",
edition = "PARTS A AND B",
note = "ASME 2010 International Mechanical Engineering Congress and Exposition, IMECE 2010 ; Conference date: 12-11-2010 Through 18-11-2010",
}