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Effects of a vortex generator pair on jet impingement heat transfer in cross-flow

Wang, Chenglong ; Wang, Lei LU ; Sundén, Bengt LU and Revstedt, Johan LU (2015) ASME Turbo Expo 2015 5B.
Abstract
Jet impingement cooling is commonly used in gas turbines. Usually the spent air from the upstream jets forms a cross-flow past the downstream jets, which degrades their heat transfer performance. In the present study, a new method was proposed to promote the jet penetration and enhance the impingement heat transfer. By placing a delta-winglet vortex generator pair (VGP) in the cross-flow upstream of the jet nozzle, it is found that the impingement heat transfer on the target wall is significantly enhanced. The stagnation region shifts upstream and expands compared to the original case. The stagnation and area-averaged Nusselt numbers also increased. The effects of the distance between the VGP and the jet nozzle l1 were also investigated.... (More)
Jet impingement cooling is commonly used in gas turbines. Usually the spent air from the upstream jets forms a cross-flow past the downstream jets, which degrades their heat transfer performance. In the present study, a new method was proposed to promote the jet penetration and enhance the impingement heat transfer. By placing a delta-winglet vortex generator pair (VGP) in the cross-flow upstream of the jet nozzle, it is found that the impingement heat transfer on the target wall is significantly enhanced. The stagnation region shifts upstream and expands compared to the original case. The stagnation and area-averaged Nusselt numbers also increased. The effects of the distance between the VGP and the jet nozzle l1 were also investigated. The optimal spacing l1 is suggested to be 4d, giving the best heat transfer performance. This study sheds new light on the enhancement of jet impingement heat transfer in a cross-flow. (Less)
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author
; ; and
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Heat transer, Vortices, Generatoirs, Cross-flow
host publication
ASME Turbo Expo 2015 : Turbine Technical Conference and Exposition - Turbine Technical Conference and Exposition
volume
5B
article number
GT2015-42236
pages
8 pages
conference name
ASME Turbo Expo 2015
conference location
Montreal, Canada
conference dates
2015-06-15 - 2015-06-19
external identifiers
  • scopus:84954356950
ISBN
978-0-7918-5672-7
DOI
10.1115/GT2015-42236
language
English
LU publication?
yes
id
cc566565-8284-46eb-840b-eb483bb1bcf0
date added to LUP
2019-04-01 18:19:43
date last changed
2025-04-04 14:45:47
@inproceedings{cc566565-8284-46eb-840b-eb483bb1bcf0,
  abstract     = {{Jet impingement cooling is commonly used in gas turbines. Usually the spent air from the upstream jets forms a cross-flow past the downstream jets, which degrades their heat transfer performance. In the present study, a new method was proposed to promote the jet penetration and enhance the impingement heat transfer. By placing a delta-winglet vortex generator pair (VGP) in the cross-flow upstream of the jet nozzle, it is found that the impingement heat transfer on the target wall is significantly enhanced. The stagnation region shifts upstream and expands compared to the original case. The stagnation and area-averaged Nusselt numbers also increased. The effects of the distance between the VGP and the jet nozzle l1 were also investigated. The optimal spacing l1 is suggested to be 4d, giving the best heat transfer performance. This study sheds new light on the enhancement of jet impingement heat transfer in a cross-flow.}},
  author       = {{Wang, Chenglong and Wang, Lei and Sundén, Bengt and Revstedt, Johan}},
  booktitle    = {{ASME Turbo Expo 2015 : Turbine Technical Conference and Exposition}},
  isbn         = {{978-0-7918-5672-7}},
  keywords     = {{Heat transer; Vortices; Generatoirs; Cross-flow}},
  language     = {{eng}},
  title        = {{Effects of a vortex generator pair on jet impingement heat transfer in cross-flow}},
  url          = {{http://dx.doi.org/10.1115/GT2015-42236}},
  doi          = {{10.1115/GT2015-42236}},
  volume       = {{5B}},
  year         = {{2015}},
}