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The augmentation of internal tip heat transfer in gas turbine blades using a pair of delta-winglet vortex generators

Zhao, Zhiqi LU ; Luo, Lei ; Qiu, Dandan LU ; Zhou, Xun ; Wang, Zhongqi and Sundén, Bengt LU (2021) In Journal of Enhanced Heat Transfer 28(3). p.17-40
Abstract

A novel method to enhance the heat transfer on the internal tip surface of gas turbine blades was developed. Effects of delta-winglet vortex generators (DWVG) and their angle of attack on the vortical structures and mechanism of enhanced heat transfer were investigated. Seven different angles of attack were considered: 0°, 15°, 30°, 45°, 60°, 75°, and 90°. The Reynolds number varies from 10,000 to 50,000. Flow topology analysis was employed to better understand the evolution of vortices in the turn region. Results showed that a vortex was induced on the leeward side of the DWVG as the angle of attack was greater than 0°, which significantly enhanced the local heat transfer. Also, an extra saddle point was generated at the tip surface... (More)

A novel method to enhance the heat transfer on the internal tip surface of gas turbine blades was developed. Effects of delta-winglet vortex generators (DWVG) and their angle of attack on the vortical structures and mechanism of enhanced heat transfer were investigated. Seven different angles of attack were considered: 0°, 15°, 30°, 45°, 60°, 75°, and 90°. The Reynolds number varies from 10,000 to 50,000. Flow topology analysis was employed to better understand the evolution of vortices in the turn region. Results showed that a vortex was induced on the leeward side of the DWVG as the angle of attack was greater than 0°, which significantly enhanced the local heat transfer. Also, an extra saddle point was generated at the tip surface on the windward side of the DWVG as the angle of attack is greater than 45°, indicating that a vortex wass formed. The internal tip heat transfer increased as the angle of attack of the DWVG increased. The optimal design was reached when the angle of attack is greater than 60°. Compared with the smooth channel, the heat transfer and overall thermal performance are enhanced by up to 9.5% and 8.1%, respectively.

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author
; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Blade tip, Delta-winglet vortex generators, Heat transfer, Internal cooling, Topological analysis
in
Journal of Enhanced Heat Transfer
volume
28
issue
3
pages
24 pages
publisher
Begell House
external identifiers
  • scopus:85104887976
ISSN
1065-5131
DOI
10.1615/JENHHEATTRANSF.2021037244
language
English
LU publication?
yes
additional info
Funding Information: This work was supported by the Harbin Institute of Technology Scholarship Fund; the National Natural Science Foundation of China [Grant No. 51706051]; China Postdoctoral Science Foundation funded project [Grant No. 2017M620116]; and China Postdoctoral Science Foundation funded project [Grant No. 2017M621268]. The computations were performed on resources provided by the Swedish National Infrastructure for Computing (SNIC) at LUNARC and partially funded by the Swedish Research Council. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.
id
73dadd0c-8eb5-4c3e-9a85-ee5b851a81f7
date added to LUP
2021-05-12 10:08:52
date last changed
2023-11-08 14:06:07
@article{73dadd0c-8eb5-4c3e-9a85-ee5b851a81f7,
  abstract     = {{<p>A novel method to enhance the heat transfer on the internal tip surface of gas turbine blades was developed. Effects of delta-winglet vortex generators (DWVG) and their angle of attack on the vortical structures and mechanism of enhanced heat transfer were investigated. Seven different angles of attack were considered: 0°, 15°, 30°, 45°, 60°, 75°, and 90°. The Reynolds number varies from 10,000 to 50,000. Flow topology analysis was employed to better understand the evolution of vortices in the turn region. Results showed that a vortex was induced on the leeward side of the DWVG as the angle of attack was greater than 0°, which significantly enhanced the local heat transfer. Also, an extra saddle point was  generated at the tip surface on the windward side of the DWVG as the angle of attack is greater than 45°, indicating that a vortex wass formed. The internal tip heat transfer increased as the angle of attack of the DWVG increased. The optimal design was reached when the angle of attack is greater than 60°. Compared with the smooth channel, the heat transfer and overall thermal performance are enhanced by up to 9.5% and 8.1%, respectively.</p>}},
  author       = {{Zhao, Zhiqi and Luo, Lei and Qiu, Dandan and Zhou, Xun and Wang, Zhongqi and Sundén, Bengt}},
  issn         = {{1065-5131}},
  keywords     = {{Blade tip; Delta-winglet vortex generators; Heat transfer; Internal cooling; Topological analysis}},
  language     = {{eng}},
  number       = {{3}},
  pages        = {{17--40}},
  publisher    = {{Begell House}},
  series       = {{Journal of Enhanced Heat Transfer}},
  title        = {{The augmentation of internal tip heat transfer in gas turbine blades using a pair of delta-winglet vortex generators}},
  url          = {{http://dx.doi.org/10.1615/JENHHEATTRANSF.2021037244}},
  doi          = {{10.1615/JENHHEATTRANSF.2021037244}},
  volume       = {{28}},
  year         = {{2021}},
}