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Effect of spherical blockage configurations on film cooling

Wang, Jin LU ; Tian, Ke ; Zhang, Kai ; Baleta, Jakov and Sunden, Bengt LU (2018) In Thermal Science 22(5). p.1933-1942
Abstract

With increasing inlet temperature of gas turbines, turbine blades need to be effec-tively protected by using cooling technologies. However, the deposition from the fuel impurities and dust particles in the air is often found inside film holes, which results in partial hole blockage. In this paper, the deposition geometry is simpli-fied as a rectangular channel, and the effect of three blockage ratios is investi-gated by using the computational fluid dynamics. In addition, water droplets are also released from the coolant inlet to provide a comparison of the results with and without mist injection. It is found that the lateral film cooling effectiveness is reduced with increasing blockage ratio. For all the cases with the blowing ratio... (More)

With increasing inlet temperature of gas turbines, turbine blades need to be effec-tively protected by using cooling technologies. However, the deposition from the fuel impurities and dust particles in the air is often found inside film holes, which results in partial hole blockage. In this paper, the deposition geometry is simpli-fied as a rectangular channel, and the effect of three blockage ratios is investi-gated by using the computational fluid dynamics. In addition, water droplets are also released from the coolant inlet to provide a comparison of the results with and without mist injection. It is found that the lateral film cooling effectiveness is reduced with increasing blockage ratio. For all the cases with the blowing ratio 0.6, 1% mist injection provides an improvement of the cooling performance by approximately 10%.

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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Blockage, Film cooling, Gas turbine, Mist injection, Sphere
in
Thermal Science
volume
22
issue
5
pages
10 pages
publisher
Vinca Inst Nuclear Sci
external identifiers
  • scopus:85056286563
ISSN
0354-9836
DOI
10.2298/TSCI171229257W
language
English
LU publication?
yes
id
53a76de8-1044-4ca5-957b-b78269d61bd2
date added to LUP
2018-11-23 13:05:36
date last changed
2020-11-03 02:04:49
@article{53a76de8-1044-4ca5-957b-b78269d61bd2,
  abstract     = {<p>With increasing inlet temperature of gas turbines, turbine blades need to be effec-tively protected by using cooling technologies. However, the deposition from the fuel impurities and dust particles in the air is often found inside film holes, which results in partial hole blockage. In this paper, the deposition geometry is simpli-fied as a rectangular channel, and the effect of three blockage ratios is investi-gated by using the computational fluid dynamics. In addition, water droplets are also released from the coolant inlet to provide a comparison of the results with and without mist injection. It is found that the lateral film cooling effectiveness is reduced with increasing blockage ratio. For all the cases with the blowing ratio 0.6, 1% mist injection provides an improvement of the cooling performance by approximately 10%.</p>},
  author       = {Wang, Jin and Tian, Ke and Zhang, Kai and Baleta, Jakov and Sunden, Bengt},
  issn         = {0354-9836},
  language     = {eng},
  number       = {5},
  pages        = {1933--1942},
  publisher    = {Vinca Inst Nuclear Sci},
  series       = {Thermal Science},
  title        = {Effect of spherical blockage configurations on film cooling},
  url          = {http://dx.doi.org/10.2298/TSCI171229257W},
  doi          = {10.2298/TSCI171229257W},
  volume       = {22},
  year         = {2018},
}