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The effect of the pocket on the heat transfer of endwall with bluff body in the rear part of gas turbine

Liu, Jian LU ; Hussain, Safeer LU ; Wang, Lei LU ; Xie, Gongnan LU ; Sundén, Bengt LU ; Abrahamsson, Hans and Arroyo, Carlos (2017) ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition, GT 2017 In Heat Transfer 5A-2017.
Abstract

A pocket cavity is generated at the connection of two parts, such as the transition part between the low pressure turbine (LPT) and outlet guide vane (OGV) in a gas turbine engine. A bluff body, working as a heat transfer enhancement part or supporting strength part, has tremendous engineering applications in turbomachinery. In the present work, the effect of the pocket on the heat transfer of endwall with a bluff body in the rear part of gas turbine is investigated. A simplified triangular pocket cavity is built in a rectangular channel and two bluff bodies, a cylinder or a cuboid is attached downstream on the endwall. The heat transfer and fluid flow on the endwall are investigated experimentally and numerically. Liquid Crystal... (More)

A pocket cavity is generated at the connection of two parts, such as the transition part between the low pressure turbine (LPT) and outlet guide vane (OGV) in a gas turbine engine. A bluff body, working as a heat transfer enhancement part or supporting strength part, has tremendous engineering applications in turbomachinery. In the present work, the effect of the pocket on the heat transfer of endwall with a bluff body in the rear part of gas turbine is investigated. A simplified triangular pocket cavity is built in a rectangular channel and two bluff bodies, a cylinder or a cuboid is attached downstream on the endwall. The heat transfer and fluid flow on the endwall are investigated experimentally and numerically. Liquid Crystal Thermography (LCT) is employed to measure the heat transfer over the pocket surface with Reynolds number ranging from 87, 597, to 218, 994. The turbulent flow details are provided by numerically calculations based on the commercial software Fluent 17.0. Based on the results, high heat transfer areas are usually found at the boundary of the pocket cavity and vortex street shedding regions around the bluff body. When a pocket cavity is placed in the upstream of a bluff body, the endwall heat transfer around the bluff body is obviously decreased due to the disturbance by the pocket. There are no recirculating flows in front of the tested cylinder while this is not applicable for the cuboid case. The recirculating flow behind the bluff bodies forms a three-dimensional flow structure rotating in two directions.

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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
Bluff body, LCT, Pocket cavity, Turbulent flow
in
Heat Transfer
volume
5A-2017
publisher
American Society Of Mechanical Engineers (ASME)
conference name
ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition, GT 2017
external identifiers
  • scopus:85029098902
ISBN
9780791850879
DOI
10.1115/GT2017-63191
language
English
LU publication?
yes
id
c0113389-9092-404d-8d24-c62cfa9a5f66
date added to LUP
2017-09-28 07:54:07
date last changed
2018-01-07 12:19:49
@inproceedings{c0113389-9092-404d-8d24-c62cfa9a5f66,
  abstract     = {<p>A pocket cavity is generated at the connection of two parts, such as the transition part between the low pressure turbine (LPT) and outlet guide vane (OGV) in a gas turbine engine. A bluff body, working as a heat transfer enhancement part or supporting strength part, has tremendous engineering applications in turbomachinery. In the present work, the effect of the pocket on the heat transfer of endwall with a bluff body in the rear part of gas turbine is investigated. A simplified triangular pocket cavity is built in a rectangular channel and two bluff bodies, a cylinder or a cuboid is attached downstream on the endwall. The heat transfer and fluid flow on the endwall are investigated experimentally and numerically. Liquid Crystal Thermography (LCT) is employed to measure the heat transfer over the pocket surface with Reynolds number ranging from 87, 597, to 218, 994. The turbulent flow details are provided by numerically calculations based on the commercial software Fluent 17.0. Based on the results, high heat transfer areas are usually found at the boundary of the pocket cavity and vortex street shedding regions around the bluff body. When a pocket cavity is placed in the upstream of a bluff body, the endwall heat transfer around the bluff body is obviously decreased due to the disturbance by the pocket. There are no recirculating flows in front of the tested cylinder while this is not applicable for the cuboid case. The recirculating flow behind the bluff bodies forms a three-dimensional flow structure rotating in two directions.</p>},
  author       = {Liu, Jian and Hussain, Safeer and Wang, Lei and Xie, Gongnan and Sundén, Bengt and Abrahamsson, Hans and Arroyo, Carlos},
  booktitle    = {Heat Transfer},
  isbn         = {9780791850879},
  keyword      = {Bluff body,LCT,Pocket cavity,Turbulent flow},
  language     = {eng},
  publisher    = {American Society Of Mechanical Engineers (ASME)},
  title        = {The effect of the pocket on the heat transfer of endwall with bluff body in the rear part of gas turbine},
  url          = {http://dx.doi.org/10.1115/GT2017-63191},
  volume       = {5A-2017},
  year         = {2017},
}