Advanced

Effect of an upstream bulge configuration on film cooling with and without mist injection

Wang, Jin LU ; Li, Qianqian; Sundén, Bengt LU ; Ma, Ting and Cui, Pei (2017) In Journal of Environmental Management
Abstract

To meet the economic requirements of power output, the increased inlet temperature of modern gas turbines is above the melting point of the material. Therefore, high-efficient cooling technology is needed to protect the blades from the hot mainstream. In this study, film cooling was investigated in a simplified channel. A bulge located upstream of the film hole was numerically investigated by analysis of the film cooling effectiveness distribution downstream of the wall. The flow distribution in the plate channel is first presented. Comparing with a case without bulge, different cases with bulge heights of 0.1d, 0.3d and 0.5d were examined with blowing ratios of 0.5 and 1.0. Cases with 1% mist injection were also included in order to... (More)

To meet the economic requirements of power output, the increased inlet temperature of modern gas turbines is above the melting point of the material. Therefore, high-efficient cooling technology is needed to protect the blades from the hot mainstream. In this study, film cooling was investigated in a simplified channel. A bulge located upstream of the film hole was numerically investigated by analysis of the film cooling effectiveness distribution downstream of the wall. The flow distribution in the plate channel is first presented. Comparing with a case without bulge, different cases with bulge heights of 0.1d, 0.3d and 0.5d were examined with blowing ratios of 0.5 and 1.0. Cases with 1% mist injection were also included in order to obtain better cooling performance. Results show that the bulge configuration located upstream the film hole makes the cooling film more uniform, and enhanceslateral cooling effectiveness. Unlike other cases, the configuration with a 0.3d-height bulge shows a good balance in improving the downstream and lateral cooling effectiveness. Compared with the case without mist at M = 0.5, the 0.3d-height bulge with 1% mist injection increases lateral average effectiveness by 559% at x/d = 55. In addition, a reduction of the thermal stress concentration can be obtained by increasing the height of the bulge configuration.

(Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
epub
subject
keywords
Bulge, Film cooling, Gas turbine, Mist, Temperature non-uniformity
in
Journal of Environmental Management
publisher
Academic Press
external identifiers
  • scopus:85021343704
ISSN
0301-4797
DOI
10.1016/j.jenvman.2017.06.055
language
English
LU publication?
yes
id
6a2b236a-4f3a-4ab4-a1d0-54f939c39845
date added to LUP
2017-07-12 14:51:12
date last changed
2017-10-22 05:33:29
@article{6a2b236a-4f3a-4ab4-a1d0-54f939c39845,
  abstract     = {<p>To meet the economic requirements of power output, the increased inlet temperature of modern gas turbines is above the melting point of the material. Therefore, high-efficient cooling technology is needed to protect the blades from the hot mainstream. In this study, film cooling was investigated in a simplified channel. A bulge located upstream of the film hole was numerically investigated by analysis of the film cooling effectiveness distribution downstream of the wall. The flow distribution in the plate channel is first presented. Comparing with a case without bulge, different cases with bulge heights of 0.1d, 0.3d and 0.5d were examined with blowing ratios of 0.5 and 1.0. Cases with 1% mist injection were also included in order to obtain better cooling performance. Results show that the bulge configuration located upstream the film hole makes the cooling film more uniform, and enhanceslateral cooling effectiveness. Unlike other cases, the configuration with a 0.3d-height bulge shows a good balance in improving the downstream and lateral cooling effectiveness. Compared with the case without mist at M = 0.5, the 0.3d-height bulge with 1% mist injection increases lateral average effectiveness by 559% at x/d = 55. In addition, a reduction of the thermal stress concentration can be obtained by increasing the height of the bulge configuration.</p>},
  author       = {Wang, Jin and Li, Qianqian and Sundén, Bengt and Ma, Ting and Cui, Pei},
  issn         = {0301-4797},
  keyword      = {Bulge,Film cooling,Gas turbine,Mist,Temperature non-uniformity},
  language     = {eng},
  month        = {06},
  publisher    = {Academic Press},
  series       = {Journal of Environmental Management},
  title        = {Effect of an upstream bulge configuration on film cooling with and without mist injection},
  url          = {http://dx.doi.org/10.1016/j.jenvman.2017.06.055},
  year         = {2017},
}