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Heat Transfer Enhancement of a Gas Turbine Blade-Tip Wall

Xie, G. and Sundén, Bengt LU (2014) In Emerging Topics in Heat Transfer: Enhancement and Heat Exchangers p.67-88
Abstract
The blade-tip region encounters high thermal loads because of the hot gas leakage flows. A common way to cool blade tips is to design serpentine passages with 180 degrees turn with the blade-tip walls inside the turbine blades. Improved internal convective cooling is therefore required to increase blade-tip lifetime. This chapter summarizes the heat transfer enhancement of an internal blade-tip wall having pins, dimples and protrusions, and the influence of guide ribs and pins material. It is found that the pinned tip exhibits best performance to improve the blade-tip cooling. However, when considering the added mechanical stress, making dimples is a more suitable way especially at low Reynolds numbers. Properly designed guide ribs might... (More)
The blade-tip region encounters high thermal loads because of the hot gas leakage flows. A common way to cool blade tips is to design serpentine passages with 180 degrees turn with the blade-tip walls inside the turbine blades. Improved internal convective cooling is therefore required to increase blade-tip lifetime. This chapter summarizes the heat transfer enhancement of an internal blade-tip wall having pins, dimples and protrusions, and the influence of guide ribs and pins material. It is found that the pinned tip exhibits best performance to improve the blade-tip cooling. However, when considering the added mechanical stress, making dimples is a more suitable way especially at low Reynolds numbers. Properly designed guide ribs might reduce the pressure loss. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Blade-tip wall, heat transfer enhancement, numerical simulation
in
Emerging Topics in Heat Transfer: Enhancement and Heat Exchangers
editor
Sundén, Bengt; Wang, Qiuwang and Chen, Yitung
pages
67 - 88
publisher
WIT Press
external identifiers
  • WOS:000342565900004
ISBN
978-1-84564-819-0
language
English
LU publication?
yes
id
0cf09b3f-53dc-422e-8647-00ec0047e00f (old id 4803708)
date added to LUP
2014-11-28 13:44:43
date last changed
2016-04-16 08:40:08
@misc{0cf09b3f-53dc-422e-8647-00ec0047e00f,
  abstract     = {The blade-tip region encounters high thermal loads because of the hot gas leakage flows. A common way to cool blade tips is to design serpentine passages with 180 degrees turn with the blade-tip walls inside the turbine blades. Improved internal convective cooling is therefore required to increase blade-tip lifetime. This chapter summarizes the heat transfer enhancement of an internal blade-tip wall having pins, dimples and protrusions, and the influence of guide ribs and pins material. It is found that the pinned tip exhibits best performance to improve the blade-tip cooling. However, when considering the added mechanical stress, making dimples is a more suitable way especially at low Reynolds numbers. Properly designed guide ribs might reduce the pressure loss.},
  author       = {Xie, G. and Sundén, Bengt},
  editor       = {Sundén, Bengt and Wang, Qiuwang and Chen, Yitung},
  isbn         = {978-1-84564-819-0},
  keyword      = {Blade-tip wall,heat transfer enhancement,numerical simulation},
  language     = {eng},
  pages        = {67--88},
  publisher    = {ARRAY(0xb556528)},
  series       = {Emerging Topics in Heat Transfer: Enhancement and Heat Exchangers},
  title        = {Heat Transfer Enhancement of a Gas Turbine Blade-Tip Wall},
  year         = {2014},
}