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Reduction of heat transfer on the endwall in the upstream junction region of a symmetric airfoil with vortex generator pair

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

Heat transfer on the endwall upstream of the junction of the stator vane/rotor blade with the hub becomes very high due to the vortices generated as a result of an adverse pressure gradient. Control of this high heat transfer is very vital for safe operation of gas turbines. In the present experimental study, a pair of vortex generators is employed to reduce the high heat transfer on the endwall close to the junction region. A pair of winglet vortex generators upstream of a symmetric airfoil have been employed. The steady state liquid crystal thermographic method is used to measure the surface temperature of the endwall. Different cases are studies depending on various lateral gaps of the vortex generator pair while keeping the yaw... (More)

Heat transfer on the endwall upstream of the junction of the stator vane/rotor blade with the hub becomes very high due to the vortices generated as a result of an adverse pressure gradient. Control of this high heat transfer is very vital for safe operation of gas turbines. In the present experimental study, a pair of vortex generators is employed to reduce the high heat transfer on the endwall close to the junction region. A pair of winglet vortex generators upstream of a symmetric airfoil have been employed. The steady state liquid crystal thermographic method is used to measure the surface temperature of the endwall. Different cases are studies depending on various lateral gaps of the vortex generator pair while keeping the yaw angle and streamwise position relative to the airfoil constant. It is found from the experiments that all positions of the vortex generators reduce the heat transfer on the junction region of the endwall compared to the base case. The level of reduction and local distribution of heat transfer is dependent on the position of vortex generators. The aerodynamic performance of a stator vane/rotor blade is the main objective in gas turbines, therefore the pressure drop is also measured experimentally and results show that pressure loss is recovered with the installation of vortex generator compared to the airfoil without the vortex generator.

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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
Airfoil, Heat transfer, Vortex generator
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:85054104982
ISBN
9780791851098
DOI
10.1115/GT2018-75176
language
English
LU publication?
yes
id
738a7dc9-3f4d-41f0-91a2-6b3aeb27c161
date added to LUP
2018-10-22 13:08:18
date last changed
2019-02-20 11:32:45
@inproceedings{738a7dc9-3f4d-41f0-91a2-6b3aeb27c161,
  abstract     = {<p>Heat transfer on the endwall upstream of the junction of the stator vane/rotor blade with the hub becomes very high due to the vortices generated as a result of an adverse pressure gradient. Control of this high heat transfer is very vital for safe operation of gas turbines. In the present experimental study, a pair of vortex generators is employed to reduce the high heat transfer on the endwall close to the junction region. A pair of winglet vortex generators upstream of a symmetric airfoil have been employed. The steady state liquid crystal thermographic method is used to measure the surface temperature of the endwall. Different cases are studies depending on various lateral gaps of the vortex generator pair while keeping the yaw angle and streamwise position relative to the airfoil constant. It is found from the experiments that all positions of the vortex generators reduce the heat transfer on the junction region of the endwall compared to the base case. The level of reduction and local distribution of heat transfer is dependent on the position of vortex generators. The aerodynamic performance of a stator vane/rotor blade is the main objective in gas turbines, therefore the pressure drop is also measured experimentally and results show that pressure loss is recovered with the installation of vortex generator compared to the airfoil without the vortex generator.</p>},
  author       = {Hussain, Safeer and Liu, Jian and Wang, Lei and Sundén, Bengt},
  isbn         = {9780791851098},
  keyword      = {Airfoil,Heat transfer,Vortex generator},
  language     = {eng},
  location     = {Oslo, Norway},
  publisher    = {American Society of Mechanical Engineers(ASME)},
  title        = {Reduction of heat transfer on the endwall in the upstream junction region of a symmetric airfoil with vortex generator pair},
  url          = {http://dx.doi.org/10.1115/GT2018-75176},
  volume       = {5B},
  year         = {2018},
}