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Effects of the location of the pocket cavity on heat transfer and flow characteristics of the endwall with a symmetrical vane

Liu, Jian LU ; Hussain, Safeer LU ; Wang, Lei LU ; Xie, Gongnan LU and Sundén, Bengt LU (2018) ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, GT 2018 5B.
Abstract

A pocket cavity is generated at the junction position of the Low Pressure Turbine (LPT) and the Outlet Guide Vane (OGV) in the rear part of a gas turbine engine. The OGV mainly controls the exhaust flow exiting and provides structural strength of the main engine frame. In the present work, the effect the location of the pocket on the heat transfer of the endwall with a symmetrical vane is investigated. A triangular pocket cavity is built in a rectangular channel and a symmetric vane is put on the endwall downstream of the pocket cavity. Heat transfer and turbulent flow characteristics over the endwall are investigated experimentally and numerically. The distance between the pocket cavity and the symmetrical vane is varied from 10 cm, 15... (More)

A pocket cavity is generated at the junction position of the Low Pressure Turbine (LPT) and the Outlet Guide Vane (OGV) in the rear part of a gas turbine engine. The OGV mainly controls the exhaust flow exiting and provides structural strength of the main engine frame. In the present work, the effect the location of the pocket on the heat transfer of the endwall with a symmetrical vane is investigated. A triangular pocket cavity is built in a rectangular channel and a symmetric vane is put on the endwall downstream of the pocket cavity. Heat transfer and turbulent flow characteristics over the endwall are investigated experimentally and numerically. The distance between the pocket cavity and the symmetrical vane is varied from 10 cm, 15 cm, and 20 cm. Liquid Crystal Thermography (LCT) is employed to measure the heat transfer over the endwall at Reynolds number ranging from 87,600 to 219,000. The turbulent flow details are presented by numerical calculations with the turbulence models, i.e., the κ-ωSST model. From this study, high heat transfer regions are usually found at where flow impingement appears, i.e., the pocket boundary edge region and the vane head region. Compared with the case of the smooth channel, the heat transfer is decreased when a pocket cavity is placed upstream of the vane. With the distance between the pocket cavity and the vane becoming larger, the effect of the pocket cavity is weakened and the heat transfer is approaching the smooth channel case, i.e., case 0. The pocket cavity strengthens the flow shedding and separates the flow away from the endwall. The pushed upward flow weakens the flow impingement on the vane and then leads to the decreased heat transfer around the vane.

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Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
LCT, Pocket cavity, Symmetric vane, Turbulent flow
host publication
ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition
volume
5B
publisher
American Society of Mechanical Engineers(ASME)
conference name
ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, GT 2018
conference location
Oslo, Norway
conference dates
2018-06-11 - 2018-06-15
external identifiers
  • scopus:85054100367
ISBN
9780791851098
DOI
10.1115/GT2018-75177
language
English
LU publication?
yes
id
9a64096e-7591-4851-89cb-ae0b9a550d84
date added to LUP
2018-10-24 08:33:08
date last changed
2019-01-06 14:11:58
@inproceedings{9a64096e-7591-4851-89cb-ae0b9a550d84,
  abstract     = {<p>A pocket cavity is generated at the junction position of the Low Pressure Turbine (LPT) and the Outlet Guide Vane (OGV) in the rear part of a gas turbine engine. The OGV mainly controls the exhaust flow exiting and provides structural strength of the main engine frame. In the present work, the effect the location of the pocket on the heat transfer of the endwall with a symmetrical vane is investigated. A triangular pocket cavity is built in a rectangular channel and a symmetric vane is put on the endwall downstream of the pocket cavity. Heat transfer and turbulent flow characteristics over the endwall are investigated experimentally and numerically. The distance between the pocket cavity and the symmetrical vane is varied from 10 cm, 15 cm, and 20 cm. Liquid Crystal Thermography (LCT) is employed to measure the heat transfer over the endwall at Reynolds number ranging from 87,600 to 219,000. The turbulent flow details are presented by numerical calculations with the turbulence models, i.e., the κ-ωSST model. From this study, high heat transfer regions are usually found at where flow impingement appears, i.e., the pocket boundary edge region and the vane head region. Compared with the case of the smooth channel, the heat transfer is decreased when a pocket cavity is placed upstream of the vane. With the distance between the pocket cavity and the vane becoming larger, the effect of the pocket cavity is weakened and the heat transfer is approaching the smooth channel case, i.e., case 0. The pocket cavity strengthens the flow shedding and separates the flow away from the endwall. The pushed upward flow weakens the flow impingement on the vane and then leads to the decreased heat transfer around the vane.</p>},
  author       = {Liu, Jian and Hussain, Safeer and Wang, Lei and Xie, Gongnan and Sundén, Bengt},
  isbn         = {9780791851098},
  keyword      = {LCT,Pocket cavity,Symmetric vane,Turbulent flow},
  language     = {eng},
  location     = {Oslo, Norway},
  publisher    = {American Society of Mechanical Engineers(ASME)},
  title        = {Effects of the location of the pocket cavity on heat transfer and flow characteristics of the endwall with a symmetrical vane},
  url          = {http://dx.doi.org/10.1115/GT2018-75177},
  volume       = {5B},
  year         = {2018},
}