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Computation of combined turbulent convective and impingement heat transfer

Sundén, Bengt LU ; Jia, Rongguang LU and Abdon, A (2004) In International Journal of Numerical Methods for Heat & Fluid Flow 14(1). p.116-133
Abstract
Impingement and forced convection are preferable methods for cooling gas turbine components. However, influences of various design parameters like crossflow and surface enlargements (like ribs) are not well understood. Thus there is a request for reliable and cost effective computational prediction methods, due to the experimental difficulties. such methods could be based on the numerical solution of the Reynolds-averaged Navier-Stokes equations, the energy equation and models for the turbulence field. This paper describes some recent advances and efforts to develop and validate computational methods for simulations of impingement and forced convection cooling in generic geometries of relevance in gas turbine cooling. Single unconfined... (More)
Impingement and forced convection are preferable methods for cooling gas turbine components. However, influences of various design parameters like crossflow and surface enlargements (like ribs) are not well understood. Thus there is a request for reliable and cost effective computational prediction methods, due to the experimental difficulties. such methods could be based on the numerical solution of the Reynolds-averaged Navier-Stokes equations, the energy equation and models for the turbulence field. This paper describes some recent advances and efforts to develop and validate computational methods for simulations of impingement and forced convection cooling in generic geometries of relevance in gas turbine cooling. Single unconfined round air jets, confined jets with crossflow, and three-dimensional ribbed ducts are considered. The numerical approach is nased on the finite volume method and uses a co-located computational grid. The considered turbulence models are all the so-called low Reynolds number models. Our recent investigations show that linear and non-linear two-equations turbulence models can be used for impinging jet heat transfer predictions with reasonable success. However, the computational results also suggest that an application of a realizability constraint is necessary to avoid over-prediction of the stagnation point heat transfer coefficients. For situations with combined forced convection, and impingement cooling is reduced. In addition, inline V-shaped 45degrees ribs pointing upstream performed superior compared to those pointing downstream and transverse ribs. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
turbulence, cooling, force measurement, convection, methods, finite volume
in
International Journal of Numerical Methods for Heat & Fluid Flow
volume
14
issue
1
pages
116 - 133
publisher
Emerald Group Publishing Limited
external identifiers
  • wos:000223932300007
  • scopus:0842283319
ISSN
1758-6585
DOI
10.1108/09615530410511667
language
English
LU publication?
yes
id
c036afb0-5bcb-48d8-9fba-97f8f0e2aa06 (old id 267093)
date added to LUP
2007-11-02 10:35:08
date last changed
2017-01-01 04:24:05
@article{c036afb0-5bcb-48d8-9fba-97f8f0e2aa06,
  abstract     = {Impingement and forced convection are preferable methods for cooling gas turbine components. However, influences of various design parameters like crossflow and surface enlargements (like ribs) are not well understood. Thus there is a request for reliable and cost effective computational prediction methods, due to the experimental difficulties. such methods could be based on the numerical solution of the Reynolds-averaged Navier-Stokes equations, the energy equation and models for the turbulence field. This paper describes some recent advances and efforts to develop and validate computational methods for simulations of impingement and forced convection cooling in generic geometries of relevance in gas turbine cooling. Single unconfined round air jets, confined jets with crossflow, and three-dimensional ribbed ducts are considered. The numerical approach is nased on the finite volume method and uses a co-located computational grid. The considered turbulence models are all the so-called low Reynolds number models. Our recent investigations show that linear and non-linear two-equations turbulence models can be used for impinging jet heat transfer predictions with reasonable success. However, the computational results also suggest that an application of a realizability constraint is necessary to avoid over-prediction of the stagnation point heat transfer coefficients. For situations with combined forced convection, and impingement cooling is reduced. In addition, inline V-shaped 45degrees ribs pointing upstream performed superior compared to those pointing downstream and transverse ribs.},
  author       = {Sundén, Bengt and Jia, Rongguang and Abdon, A},
  issn         = {1758-6585},
  keyword      = {turbulence,cooling,force measurement,convection,methods,finite volume},
  language     = {eng},
  number       = {1},
  pages        = {116--133},
  publisher    = {Emerald Group Publishing Limited},
  series       = {International Journal of Numerical Methods for Heat & Fluid Flow},
  title        = {Computation of combined turbulent convective and impingement heat transfer},
  url          = {http://dx.doi.org/10.1108/09615530410511667},
  volume       = {14},
  year         = {2004},
}