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Influence of Different Rim Widths and Blowing Ratios on Film Cooling Characteristics for a Blade Tip

Wang, Jin; Sundén, Bengt LU ; Zeng, Min and Wang, Qiu-wang (2012) In Journal of Heat Transfer 134(6).
Abstract
Three-dimensional simulations of the squealer tip on the GE-E-3 blade with eight film cooling holes were carried out. The effect of the rim width and the blowing ratio on the blade tip flow and cooling performance were revealed. Numerical simulations were performed to predict the leakage flow and the tip heat transfer with the k-epsilon model. For the squealer tip, the depth of the cavity is fixed but the rim width varies to form a wide cavity, which can decrease the coolant momentum and the tip leakage flow velocity. This cavity contributes to the improvement of the cooling effect in the tip zone. To investigate the influence on the tip heat transfer by the rim width, numerical simulations were performed as a two-part study: (1) unequal... (More)
Three-dimensional simulations of the squealer tip on the GE-E-3 blade with eight film cooling holes were carried out. The effect of the rim width and the blowing ratio on the blade tip flow and cooling performance were revealed. Numerical simulations were performed to predict the leakage flow and the tip heat transfer with the k-epsilon model. For the squealer tip, the depth of the cavity is fixed but the rim width varies to form a wide cavity, which can decrease the coolant momentum and the tip leakage flow velocity. This cavity contributes to the improvement of the cooling effect in the tip zone. To investigate the influence on the tip heat transfer by the rim width, numerical simulations were performed as a two-part study: (1) unequal rim width study on the pressure side and the suction side and (2) equal rim width study with rim widths of 0.58%, 1.16%, and 1.74% of the axial chord (0.5 mm, 1 mm, and 1.5 mm, respectively) on both the pressure side rim and the suction side rim. With different rim widths, the effect of different global blowing ratios, i.e., M = 0.5, 1.0 and 1.5, was investigated. It is found that the total heat transfer rate is increasing and the heat transfer rates on the rim surface (RS) rapidly ascend with increasing rim width. [DOI: 10.1115/1.4006017] (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
film cooling, squealer tip, rim width, leakage flow, blowing ratio, GE-E-3 blade
in
Journal of Heat Transfer
volume
134
issue
6
publisher
American Society Of Mechanical Engineers (ASME)
external identifiers
  • wos:000304825100005
  • scopus:84862061380
ISSN
0022-1481
DOI
10.1115/1.4006017
language
English
LU publication?
yes
id
90dbc4dc-61b5-421c-b8c8-3584878b2cff (old id 2896920)
date added to LUP
2012-07-24 11:14:22
date last changed
2017-10-22 04:22:38
@article{90dbc4dc-61b5-421c-b8c8-3584878b2cff,
  abstract     = {Three-dimensional simulations of the squealer tip on the GE-E-3 blade with eight film cooling holes were carried out. The effect of the rim width and the blowing ratio on the blade tip flow and cooling performance were revealed. Numerical simulations were performed to predict the leakage flow and the tip heat transfer with the k-epsilon model. For the squealer tip, the depth of the cavity is fixed but the rim width varies to form a wide cavity, which can decrease the coolant momentum and the tip leakage flow velocity. This cavity contributes to the improvement of the cooling effect in the tip zone. To investigate the influence on the tip heat transfer by the rim width, numerical simulations were performed as a two-part study: (1) unequal rim width study on the pressure side and the suction side and (2) equal rim width study with rim widths of 0.58%, 1.16%, and 1.74% of the axial chord (0.5 mm, 1 mm, and 1.5 mm, respectively) on both the pressure side rim and the suction side rim. With different rim widths, the effect of different global blowing ratios, i.e., M = 0.5, 1.0 and 1.5, was investigated. It is found that the total heat transfer rate is increasing and the heat transfer rates on the rim surface (RS) rapidly ascend with increasing rim width. [DOI: 10.1115/1.4006017]},
  author       = {Wang, Jin and Sundén, Bengt and Zeng, Min and Wang, Qiu-wang},
  issn         = {0022-1481},
  keyword      = {film cooling,squealer tip,rim width,leakage flow,blowing ratio,GE-E-3 blade},
  language     = {eng},
  number       = {6},
  publisher    = {American Society Of Mechanical Engineers (ASME)},
  series       = {Journal of Heat Transfer},
  title        = {Influence of Different Rim Widths and Blowing Ratios on Film Cooling Characteristics for a Blade Tip},
  url          = {http://dx.doi.org/10.1115/1.4006017},
  volume       = {134},
  year         = {2012},
}