Computational investigation of curvature effects on jet impingement heat transfer at internally cooled turbine vane leading edge regions
(2020) In Heat Transfer Research 51(4). p.333-357- Abstract
This study is carried out by using numerical simulations to investigate the effect of target surface curvature and the nozzle-to-target surface distance on the flow structure and heat transfer characteristics in a pin-finned double-wall cooling structure. The flow is directly impinging on the target surface and is disturbed by the pin fins, and then released from the film holes after passing the double-wall chamber. The ratio between the radius of the concave outer surface and the chord length of the concave outer surface is varied from 0.500 to 1.300 and the ratio between nozzle-to-target surface distance and diameter of impingement hole is ranging from 0.5 to 2.0. The Reynolds number is between 10,000 and 50,000. Results of the flow... (More)
This study is carried out by using numerical simulations to investigate the effect of target surface curvature and the nozzle-to-target surface distance on the flow structure and heat transfer characteristics in a pin-finned double-wall cooling structure. The flow is directly impinging on the target surface and is disturbed by the pin fins, and then released from the film holes after passing the double-wall chamber. The ratio between the radius of the concave outer surface and the chord length of the concave outer surface is varied from 0.500 to 1.300 and the ratio between nozzle-to-target surface distance and diameter of impingement hole is ranging from 0.5 to 2.0. The Reynolds number is between 10,000 and 50,000. Results of the flow structure in the chamber, heat transfer on the target surface, and friction factor of the pin-fi nned channel are included. It is found that an increase of the target surface curvature has signifi cant effects on the flow structure and thus the heat transfer on the target surface is augmented. The Taylor-Görtler vortices near the pin fins are also influenced by the target surface curvature. On the other hand, the nozzle-to-target surface distance influences the jet impingement and the vortices, which are generated by the curvature, remarkably. It is found that the area goodness factor and volume goodness factor are improved by the surface curvature.
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- author
- Luo, Lei ; Zhang, Yifeng ; Sundén, Bengt LU ; Qiu, Dandan LU ; Wang, Songtao and Zhang, Xinghong
- organization
- publishing date
- 2020
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Double-wall cooling structure, Flow structure, Friction factor, Heat transfer, Nozzle to target surface distance, Target surface curvature
- in
- Heat Transfer Research
- volume
- 51
- issue
- 4
- pages
- 25 pages
- publisher
- Begell House
- external identifiers
-
- scopus:85082739431
- ISSN
- 1064-2285
- DOI
- 10.1615/HeatTransRes.2019029853
- language
- English
- LU publication?
- yes
- id
- 64d4a5ca-33d6-435b-a225-81a302c45cd2
- date added to LUP
- 2020-04-27 16:19:49
- date last changed
- 2023-11-20 03:20:09
@article{64d4a5ca-33d6-435b-a225-81a302c45cd2,
abstract = {{<p>This study is carried out by using numerical simulations to investigate the effect of target surface curvature and the nozzle-to-target surface distance on the flow structure and heat transfer characteristics in a pin-finned double-wall cooling structure. The flow is directly impinging on the target surface and is disturbed by the pin fins, and then released from the film holes after passing the double-wall chamber. The ratio between the radius of the concave outer surface and the chord length of the concave outer surface is varied from 0.500 to 1.300 and the ratio between nozzle-to-target surface distance and diameter of impingement hole is ranging from 0.5 to 2.0. The Reynolds number is between 10,000 and 50,000. Results of the flow structure in the chamber, heat transfer on the target surface, and friction factor of the pin-fi nned channel are included. It is found that an increase of the target surface curvature has signifi cant effects on the flow structure and thus the heat transfer on the target surface is augmented. The Taylor-Görtler vortices near the pin fins are also influenced by the target surface curvature. On the other hand, the nozzle-to-target surface distance influences the jet impingement and the vortices, which are generated by the curvature, remarkably. It is found that the area goodness factor and volume goodness factor are improved by the surface curvature.</p>}},
author = {{Luo, Lei and Zhang, Yifeng and Sundén, Bengt and Qiu, Dandan and Wang, Songtao and Zhang, Xinghong}},
issn = {{1064-2285}},
keywords = {{Double-wall cooling structure; Flow structure; Friction factor; Heat transfer; Nozzle to target surface distance; Target surface curvature}},
language = {{eng}},
number = {{4}},
pages = {{333--357}},
publisher = {{Begell House}},
series = {{Heat Transfer Research}},
title = {{Computational investigation of curvature effects on jet impingement heat transfer at internally cooled turbine vane leading edge regions}},
url = {{http://dx.doi.org/10.1615/HeatTransRes.2019029853}},
doi = {{10.1615/HeatTransRes.2019029853}},
volume = {{51}},
year = {{2020}},
}