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Parametric study on heat transfer enhancement and pressure drop of an internal blade tip-wall with pin-fin arrays

Xie, Gongnan; Sundén, Bengt LU ; Wang, Lieke and Utriainen, Esa (2011) In Heat and Mass Transfer 47(1). p.45-57
Abstract
One way to cool gas turbine tips is to design serpentine passages with 180A degrees turns inside the blades to fully utilize the coolant potential. It is therefore a desire to improve the cooling of the blade tips to ensure a long durability and safe operation. In the present work, a two-pass channel with a 180A degrees turn and various arrays of pin-fins mounted internally on the tip-cap is considered. The effects of pin-fin height, diameter and pitches on the heat transfer enhancement and pressure drop are investigated numerically. The nominal ratio of height to diameter (H/D) of the pin-fins is 2, and the ratio of tip clearance to pin-fin height is about 10. The inlet Reynolds numbers based on hydraulic diameter are ranging from 100,000... (More)
One way to cool gas turbine tips is to design serpentine passages with 180A degrees turns inside the blades to fully utilize the coolant potential. It is therefore a desire to improve the cooling of the blade tips to ensure a long durability and safe operation. In the present work, a two-pass channel with a 180A degrees turn and various arrays of pin-fins mounted internally on the tip-cap is considered. The effects of pin-fin height, diameter and pitches on the heat transfer enhancement and pressure drop are investigated numerically. The nominal ratio of height to diameter (H/D) of the pin-fins is 2, and the ratio of tip clearance to pin-fin height is about 10. The inlet Reynolds numbers based on hydraulic diameter are ranging from 100,000 to 600,000. Details of the three dimensional fluid flow and heat transfer over the pin-finned tips are presented. The overall performances of various tips are compared. It is found that due to the combination of turning, impingement and pin-fin crossflow, the heat transfer coefficient of the pin-finned tips is up to a factor of 2.1 higher than that of the smooth tip. This augmentation is achieved at the expense of a penalty of pressure drop around 30%. Results show that the magnitude of the heat transfer enhancement depends upon pin-fin configuration and arrangement. It is suggested that pin-fins are suitable to enhance the blade tip heat transfer and thus to improve the tip cooling. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Heat and Mass Transfer
volume
47
issue
1
pages
45 - 57
publisher
Springer
external identifiers
  • wos:000286118300005
  • scopus:79951948682
ISSN
1432-1181
DOI
10.1007/s00231-010-0671-x
language
English
LU publication?
yes
id
3c728a86-e7aa-4456-9cd3-2ad40cb9f460 (old id 1872908)
date added to LUP
2011-04-18 11:07:03
date last changed
2017-01-01 03:38:24
@article{3c728a86-e7aa-4456-9cd3-2ad40cb9f460,
  abstract     = {One way to cool gas turbine tips is to design serpentine passages with 180A degrees turns inside the blades to fully utilize the coolant potential. It is therefore a desire to improve the cooling of the blade tips to ensure a long durability and safe operation. In the present work, a two-pass channel with a 180A degrees turn and various arrays of pin-fins mounted internally on the tip-cap is considered. The effects of pin-fin height, diameter and pitches on the heat transfer enhancement and pressure drop are investigated numerically. The nominal ratio of height to diameter (H/D) of the pin-fins is 2, and the ratio of tip clearance to pin-fin height is about 10. The inlet Reynolds numbers based on hydraulic diameter are ranging from 100,000 to 600,000. Details of the three dimensional fluid flow and heat transfer over the pin-finned tips are presented. The overall performances of various tips are compared. It is found that due to the combination of turning, impingement and pin-fin crossflow, the heat transfer coefficient of the pin-finned tips is up to a factor of 2.1 higher than that of the smooth tip. This augmentation is achieved at the expense of a penalty of pressure drop around 30%. Results show that the magnitude of the heat transfer enhancement depends upon pin-fin configuration and arrangement. It is suggested that pin-fins are suitable to enhance the blade tip heat transfer and thus to improve the tip cooling.},
  author       = {Xie, Gongnan and Sundén, Bengt and Wang, Lieke and Utriainen, Esa},
  issn         = {1432-1181},
  language     = {eng},
  number       = {1},
  pages        = {45--57},
  publisher    = {Springer},
  series       = {Heat and Mass Transfer},
  title        = {Parametric study on heat transfer enhancement and pressure drop of an internal blade tip-wall with pin-fin arrays},
  url          = {http://dx.doi.org/10.1007/s00231-010-0671-x},
  volume       = {47},
  year         = {2011},
}