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Investigations of film cooling and its nonuniform distribution for the conjugate heat transfer passage with a compound inclined angle jet

Wang, Jin; Gu, Chunwei and Sundén, Bengt LU (2016) In Numerical Heat Transfer Part A: Applications 69(1). p.14-30
Abstract
Film cooling effectiveness and its distribution characteristics on the gas turbine blade surface were investigated numerically. Seven rectangular ribs were located on the internal wall, and a film cooling hole had a compound inclined angle. The case with a compound angle of 45 degrees was designed to improve the lateral film cooling effectiveness on the downstream surface. The secondary flow jet from the internal channel was affected by the flow velocity ratios, and an investigation of the external film cooling was considered for various values of thermal conductivity and heat conduction. Two different plate materials were used to analyze the effect of plate thermal conductivity. The results showed that the compound angle of 45 degrees... (More)
Film cooling effectiveness and its distribution characteristics on the gas turbine blade surface were investigated numerically. Seven rectangular ribs were located on the internal wall, and a film cooling hole had a compound inclined angle. The case with a compound angle of 45 degrees was designed to improve the lateral film cooling effectiveness on the downstream surface. The secondary flow jet from the internal channel was affected by the flow velocity ratios, and an investigation of the external film cooling was considered for various values of thermal conductivity and heat conduction. Two different plate materials were used to analyze the effect of plate thermal conductivity. The results showed that the compound angle of 45 degrees causes an asymmetric distribution of the film cooling effectiveness. However, the bending effect can be of advantage to increase the film cooling effectiveness in the horizontal direction, so a better distribution of the lateral film cooling effectiveness can be achieved. The area-average cooling effectiveness is improved by an increase of the flow rate at the internal passage inlet. A new definition of D-n is introduced to evaluate the nonuniformity of the distribution of the local film cooling effectiveness quantitatively and conveniently. The downstream cooling effectiveness distribution becomes more uniform using a compound angle of 45 degrees. For the high thermal conductivity case, higher blade-wall heat flux is transferred by heat conduction, which drops the area-average wall temperature along the secondary flow direction. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Numerical Heat Transfer Part A: Applications
volume
69
issue
1
pages
14 - 30
publisher
Taylor & Francis
external identifiers
  • wos:000364325900002
  • scopus:84947020907
ISSN
1040-7782
DOI
10.1080/10407782.2015.1023156
language
English
LU publication?
yes
id
05cf90db-922f-498a-bcbe-bc2a2f1eb9ed (old id 8386459)
date added to LUP
2015-12-22 08:03:14
date last changed
2017-10-29 04:03:15
@article{05cf90db-922f-498a-bcbe-bc2a2f1eb9ed,
  abstract     = {Film cooling effectiveness and its distribution characteristics on the gas turbine blade surface were investigated numerically. Seven rectangular ribs were located on the internal wall, and a film cooling hole had a compound inclined angle. The case with a compound angle of 45 degrees was designed to improve the lateral film cooling effectiveness on the downstream surface. The secondary flow jet from the internal channel was affected by the flow velocity ratios, and an investigation of the external film cooling was considered for various values of thermal conductivity and heat conduction. Two different plate materials were used to analyze the effect of plate thermal conductivity. The results showed that the compound angle of 45 degrees causes an asymmetric distribution of the film cooling effectiveness. However, the bending effect can be of advantage to increase the film cooling effectiveness in the horizontal direction, so a better distribution of the lateral film cooling effectiveness can be achieved. The area-average cooling effectiveness is improved by an increase of the flow rate at the internal passage inlet. A new definition of D-n is introduced to evaluate the nonuniformity of the distribution of the local film cooling effectiveness quantitatively and conveniently. The downstream cooling effectiveness distribution becomes more uniform using a compound angle of 45 degrees. For the high thermal conductivity case, higher blade-wall heat flux is transferred by heat conduction, which drops the area-average wall temperature along the secondary flow direction.},
  author       = {Wang, Jin and Gu, Chunwei and Sundén, Bengt},
  issn         = {1040-7782},
  language     = {eng},
  number       = {1},
  pages        = {14--30},
  publisher    = {Taylor & Francis},
  series       = {Numerical Heat Transfer Part A: Applications},
  title        = {Investigations of film cooling and its nonuniform distribution for the conjugate heat transfer passage with a compound inclined angle jet},
  url          = {http://dx.doi.org/10.1080/10407782.2015.1023156},
  volume       = {69},
  year         = {2016},
}