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Effect of blockage configuration on film cooling with and without mist injection

Tian, Ke ; Wang, Jin LU ; Liu, Chao ; Yang, Li and Sundén, Bengt LU (2018) In Energy 153. p.661-670
Abstract

Film cooling, as an effective protection technology, is widely applied in gas turbines to prevent components like vane blades from the hot mainstream. However, ash and other contaminants contained in the gas easily deposit on blade surfaces, which results in blockages inside the film holes and a reduction of the coverage area of the coolant air. Two blockage configurations (hemispherical and tetrahedral blockages) with a similar blockage ratio are analyzed in this study. In addition, mist injection with three droplet sizes (1 μm, 5 μm and 10 μm) is also considered. It is found that the position of the blockage configuration shows almost no influence on the cooling performance. In addition, the hemispherical blockage configuration... (More)

Film cooling, as an effective protection technology, is widely applied in gas turbines to prevent components like vane blades from the hot mainstream. However, ash and other contaminants contained in the gas easily deposit on blade surfaces, which results in blockages inside the film holes and a reduction of the coverage area of the coolant air. Two blockage configurations (hemispherical and tetrahedral blockages) with a similar blockage ratio are analyzed in this study. In addition, mist injection with three droplet sizes (1 μm, 5 μm and 10 μm) is also considered. It is found that the position of the blockage configuration shows almost no influence on the cooling performance. In addition, the hemispherical blockage configuration results in a lower lateral film cooling effectiveness than the tetrahedral one. Finally, it is also concluded that the 5 μm droplet case shows more uniform distribution than other cases.

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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Blockage, Droplet size, Film cooling, Gas turbine, Mist cooling
in
Energy
volume
153
pages
10 pages
publisher
Elsevier
external identifiers
  • scopus:85047493791
ISSN
0360-5442
DOI
10.1016/j.energy.2018.04.050
language
English
LU publication?
yes
id
e63c90e0-878a-4d9f-ba3d-041713330b23
date added to LUP
2018-06-05 09:53:25
date last changed
2020-12-29 02:52:08
@article{e63c90e0-878a-4d9f-ba3d-041713330b23,
  abstract     = {<p>Film cooling, as an effective protection technology, is widely applied in gas turbines to prevent components like vane blades from the hot mainstream. However, ash and other contaminants contained in the gas easily deposit on blade surfaces, which results in blockages inside the film holes and a reduction of the coverage area of the coolant air. Two blockage configurations (hemispherical and tetrahedral blockages) with a similar blockage ratio are analyzed in this study. In addition, mist injection with three droplet sizes (1 μm, 5 μm and 10 μm) is also considered. It is found that the position of the blockage configuration shows almost no influence on the cooling performance. In addition, the hemispherical blockage configuration results in a lower lateral film cooling effectiveness than the tetrahedral one. Finally, it is also concluded that the 5 μm droplet case shows more uniform distribution than other cases.</p>},
  author       = {Tian, Ke and Wang, Jin and Liu, Chao and Yang, Li and Sundén, Bengt},
  issn         = {0360-5442},
  language     = {eng},
  month        = {06},
  pages        = {661--670},
  publisher    = {Elsevier},
  series       = {Energy},
  title        = {Effect of blockage configuration on film cooling with and without mist injection},
  url          = {http://dx.doi.org/10.1016/j.energy.2018.04.050},
  doi          = {10.1016/j.energy.2018.04.050},
  volume       = {153},
  year         = {2018},
}