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A numerical,and experimental investigation of the slot film-cooling jet with various angles

Jia, Rongguang LU and Sundén, Bengt LU (2005) In Journal of Turbomachinery 127(3). p.635-645
Abstract
Numerical simulations coupled with laser Doppler velocimetry (LDV) experiments were carried out to investigate a slot jet issued into a cross flow, which is relevant in the film cooling of gas turbine combustors. The film-cooling fluid injection from slots or holes into a cross flow produces highly complicated flow,fields. In this paper, the time-averaged Navier-Stokes equations were solved on a collocated body-fitted grid system with the shear stress transport k-omega, V2F k-epsilon, and stress-omega turbulence models. The fluid flow and turbulent Reynolds stress fields were compared to the LDV experiments for three jet angles, namely, 30, 60, and 90 deg, and the jet blowing ratio is ranging from 2 to 9. Good agreement was obtained.... (More)
Numerical simulations coupled with laser Doppler velocimetry (LDV) experiments were carried out to investigate a slot jet issued into a cross flow, which is relevant in the film cooling of gas turbine combustors. The film-cooling fluid injection from slots or holes into a cross flow produces highly complicated flow,fields. In this paper, the time-averaged Navier-Stokes equations were solved on a collocated body-fitted grid system with the shear stress transport k-omega, V2F k-epsilon, and stress-omega turbulence models. The fluid flow and turbulent Reynolds stress fields were compared to the LDV experiments for three jet angles, namely, 30, 60, and 90 deg, and the jet blowing ratio is ranging from 2 to 9. Good agreement was obtained. Therefore, the present solution procedure was also adopted to calculations of 15 and 40 deg jets. In addition, the temperature fields were computed with a simple eddy diffusivity model to obtain the film-cooling effectiveness, which, in turn, was used for evaluation of the various jet cross-flow arrangements. The results show that a recirculation bubble downstream of the jet exists for jet angles larger than 40 deg, but it vanishes when the angle is < 30 deg, which is in good accordance with the experiments. The blowing ratio has a large effect on the size of the recirculation bubble and, consequently, on the film cooling effectiveness. In addition, the influence of boundary conditions for the jet and cross flow are also addressed in the paper. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Turbomachinery
volume
127
issue
3
pages
635 - 645
publisher
American Society Of Mechanical Engineers (ASME)
external identifiers
  • wos:000231074100026
  • scopus:23844503893
ISSN
1528-8900
DOI
10.1115/1.1929821
language
English
LU publication?
yes
id
ab83f437-99b1-499b-b2b7-f84f9fe16223 (old id 227462)
date added to LUP
2007-08-03 10:52:24
date last changed
2017-01-01 04:25:30
@article{ab83f437-99b1-499b-b2b7-f84f9fe16223,
  abstract     = {Numerical simulations coupled with laser Doppler velocimetry (LDV) experiments were carried out to investigate a slot jet issued into a cross flow, which is relevant in the film cooling of gas turbine combustors. The film-cooling fluid injection from slots or holes into a cross flow produces highly complicated flow,fields. In this paper, the time-averaged Navier-Stokes equations were solved on a collocated body-fitted grid system with the shear stress transport k-omega, V2F k-epsilon, and stress-omega turbulence models. The fluid flow and turbulent Reynolds stress fields were compared to the LDV experiments for three jet angles, namely, 30, 60, and 90 deg, and the jet blowing ratio is ranging from 2 to 9. Good agreement was obtained. Therefore, the present solution procedure was also adopted to calculations of 15 and 40 deg jets. In addition, the temperature fields were computed with a simple eddy diffusivity model to obtain the film-cooling effectiveness, which, in turn, was used for evaluation of the various jet cross-flow arrangements. The results show that a recirculation bubble downstream of the jet exists for jet angles larger than 40 deg, but it vanishes when the angle is &lt; 30 deg, which is in good accordance with the experiments. The blowing ratio has a large effect on the size of the recirculation bubble and, consequently, on the film cooling effectiveness. In addition, the influence of boundary conditions for the jet and cross flow are also addressed in the paper.},
  author       = {Jia, Rongguang and Sundén, Bengt},
  issn         = {1528-8900},
  language     = {eng},
  number       = {3},
  pages        = {635--645},
  publisher    = {American Society Of Mechanical Engineers (ASME)},
  series       = {Journal of Turbomachinery},
  title        = {A numerical,and experimental investigation of the slot film-cooling jet with various angles},
  url          = {http://dx.doi.org/10.1115/1.1929821},
  volume       = {127},
  year         = {2005},
}