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Surface temperature reduction by using dimples/protrusions in a realistic turbine blade trailing edge

Luo, Lei; Qiu, Dandan; Du, Wei LU ; Sundén, Bengt LU ; Wang, Zhongqi and Zhang, Xinghong (2018) In Numerical Heat Transfer; Part A: Applications 74(5). p.1265-1283
Abstract

In this article, numerical simulations have been conducted on the heat transfer effect of dimple/protrusion layouts of a pin-finned wedge duct. Conjugate heat transfer calculations are further performed to investigate the cooling effect of modified schemes with dimples and protrusions added. Comparisons are carried out with a turbine second stage guide vane employed as the prototype. The dimple/protrusion-pin fin arrangement is set as the optimum one obtained above, and dimple depth/protrusion height varies from 0.2 to 0.3 times the structure diameter. It is found that the side-by-side arrangement and protrusion structure is more beneficial for the wedge duct endwall heat transfer. Comparison with the prototype blade shows that the... (More)

In this article, numerical simulations have been conducted on the heat transfer effect of dimple/protrusion layouts of a pin-finned wedge duct. Conjugate heat transfer calculations are further performed to investigate the cooling effect of modified schemes with dimples and protrusions added. Comparisons are carried out with a turbine second stage guide vane employed as the prototype. The dimple/protrusion-pin fin arrangement is set as the optimum one obtained above, and dimple depth/protrusion height varies from 0.2 to 0.3 times the structure diameter. It is found that the side-by-side arrangement and protrusion structure is more beneficial for the wedge duct endwall heat transfer. Comparison with the prototype blade shows that the addition of both dimples and protrusions are helpful in enhancing the trailing edge cooling effect. The cooling effect is increased with an increase in dimple depth/protrusion height. The results also show that the modified blade with protrusions attached at 0.3 height saves 0.48 g/s cooling mass flow and reaches the most positive performance with a 17 K, 14 K average temperature reduction, 0.022, 0.018 cooling effect increasing for pressure, suction side, respectively.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Numerical Heat Transfer; Part A: Applications
volume
74
issue
5
pages
1265 - 1283
publisher
Taylor & Francis
external identifiers
  • scopus:85055472628
ISSN
1040-7782
DOI
10.1080/10407782.2018.1515333
language
English
LU publication?
yes
id
59843708-d51e-4493-bca3-64976beff12f
date added to LUP
2018-11-26 08:24:10
date last changed
2019-02-20 11:37:36
@article{59843708-d51e-4493-bca3-64976beff12f,
  abstract     = {<p>In this article, numerical simulations have been conducted on the heat transfer effect of dimple/protrusion layouts of a pin-finned wedge duct. Conjugate heat transfer calculations are further performed to investigate the cooling effect of modified schemes with dimples and protrusions added. Comparisons are carried out with a turbine second stage guide vane employed as the prototype. The dimple/protrusion-pin fin arrangement is set as the optimum one obtained above, and dimple depth/protrusion height varies from 0.2 to 0.3 times the structure diameter. It is found that the side-by-side arrangement and protrusion structure is more beneficial for the wedge duct endwall heat transfer. Comparison with the prototype blade shows that the addition of both dimples and protrusions are helpful in enhancing the trailing edge cooling effect. The cooling effect is increased with an increase in dimple depth/protrusion height. The results also show that the modified blade with protrusions attached at 0.3 height saves 0.48 g/s cooling mass flow and reaches the most positive performance with a 17 K, 14 K average temperature reduction, 0.022, 0.018 cooling effect increasing for pressure, suction side, respectively.</p>},
  author       = {Luo, Lei and Qiu, Dandan and Du, Wei and Sundén, Bengt and Wang, Zhongqi and Zhang, Xinghong},
  issn         = {1040-7782},
  language     = {eng},
  number       = {5},
  pages        = {1265--1283},
  publisher    = {Taylor & Francis},
  series       = {Numerical Heat Transfer; Part A: Applications},
  title        = {Surface temperature reduction by using dimples/protrusions in a realistic turbine blade trailing edge},
  url          = {http://dx.doi.org/10.1080/10407782.2018.1515333},
  volume       = {74},
  year         = {2018},
}