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Heat transfer and turbulent flow characteristics over pocket cavity in the junction part of an outlet guide vane in a gas turbine

Liu, Jian LU ; Hussain, Safeer LU ; Wang, Lei LU ; Xie, Gongnan LU and Sundén, Bengt LU (2017) In Applied Thermal Engineering 124. p.831-843
Abstract

A pocket cavity is generated when the Low Pressure Turbine (LPT) is connected to the Outlet Guide Vane (OGV) in the rear part of a gas turbine engine due to the different conjugate diameters. This kind of pocket cavities, due to the high Reynolds number and the specific shapes, are hardly investigated in previous researches. The heat transfer distribution and fluid flow over the pocket cavity have significant effects on the incoming flow of the OGV in the downstream distribution. In the present work, the specified triangular pocket cavities are built in a high aspect ratio channel and heat transfer and fluid flow over the pocket surface are investigated experimentally and numerically. These pocket cavities are built with different radii... (More)

A pocket cavity is generated when the Low Pressure Turbine (LPT) is connected to the Outlet Guide Vane (OGV) in the rear part of a gas turbine engine due to the different conjugate diameters. This kind of pocket cavities, due to the high Reynolds number and the specific shapes, are hardly investigated in previous researches. The heat transfer distribution and fluid flow over the pocket cavity have significant effects on the incoming flow of the OGV in the downstream distribution. In the present work, the specified triangular pocket cavities are built in a high aspect ratio channel and heat transfer and fluid flow over the pocket surface are investigated experimentally and numerically. These pocket cavities are built with different radii to find out optimized heat transfer distributions and flow patterns. Liquid Crystal Thermography (LCT) is employed to measure heat transfer over the pocket surfaces at Reynolds number ranging from 87,600 to 219,000. Flow details are provided by numerical calculations with a suitable turbulence model. In this study, the largest heat transfer regions over a pocket cavity are found to be at the downstream edge where strong flow impingement occurs. The peak values are influenced by the size of the fillet radius. The smaller fillet radius provides a higher heat transfer peak value with a stronger recirculating flow inside the pocket cavity. However, the pocket cavity with the larger fillet radius can reduce the peak heat transfer values but increase the overall averaged heat transfer value of the pocket surface with weakened strength of the recirculating flows. Accordingly, the larger fillet radius is recommended for the design of the pocket cavity in the rear part of a gas turbine engine.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Fillet radius, Flow impingement, LCT, Peak value, Pocket cavity, Turbulence model
in
Applied Thermal Engineering
volume
124
pages
13 pages
publisher
Elsevier
external identifiers
  • scopus:85021099481
  • wos:000407185000080
ISSN
1359-4311
DOI
10.1016/j.applthermaleng.2017.06.089
language
English
LU publication?
yes
id
cff4093d-7b65-48ed-9c1b-fb02a1adb83e
date added to LUP
2017-07-11 08:54:14
date last changed
2018-03-18 05:14:34
@article{cff4093d-7b65-48ed-9c1b-fb02a1adb83e,
  abstract     = {<p>A pocket cavity is generated when the Low Pressure Turbine (LPT) is connected to the Outlet Guide Vane (OGV) in the rear part of a gas turbine engine due to the different conjugate diameters. This kind of pocket cavities, due to the high Reynolds number and the specific shapes, are hardly investigated in previous researches. The heat transfer distribution and fluid flow over the pocket cavity have significant effects on the incoming flow of the OGV in the downstream distribution. In the present work, the specified triangular pocket cavities are built in a high aspect ratio channel and heat transfer and fluid flow over the pocket surface are investigated experimentally and numerically. These pocket cavities are built with different radii to find out optimized heat transfer distributions and flow patterns. Liquid Crystal Thermography (LCT) is employed to measure heat transfer over the pocket surfaces at Reynolds number ranging from 87,600 to 219,000. Flow details are provided by numerical calculations with a suitable turbulence model. In this study, the largest heat transfer regions over a pocket cavity are found to be at the downstream edge where strong flow impingement occurs. The peak values are influenced by the size of the fillet radius. The smaller fillet radius provides a higher heat transfer peak value with a stronger recirculating flow inside the pocket cavity. However, the pocket cavity with the larger fillet radius can reduce the peak heat transfer values but increase the overall averaged heat transfer value of the pocket surface with weakened strength of the recirculating flows. Accordingly, the larger fillet radius is recommended for the design of the pocket cavity in the rear part of a gas turbine engine.</p>},
  author       = {Liu, Jian and Hussain, Safeer and Wang, Lei and Xie, Gongnan and Sundén, Bengt},
  issn         = {1359-4311},
  keyword      = {Fillet radius,Flow impingement,LCT,Peak value,Pocket cavity,Turbulence model},
  language     = {eng},
  month        = {09},
  pages        = {831--843},
  publisher    = {Elsevier},
  series       = {Applied Thermal Engineering},
  title        = {Heat transfer and turbulent flow characteristics over pocket cavity in the junction part of an outlet guide vane in a gas turbine},
  url          = {http://dx.doi.org/10.1016/j.applthermaleng.2017.06.089},
  volume       = {124},
  year         = {2017},
}