On heat transfer and flow characteristics of jets impinging onto concave surface with varying bleeding arrangements
(2021) In International Journal of Numerical Methods for Heat and Fluid Flow 31(12). p.3642-3660- Abstract
Purpose: The purpose of this study is to investigate the effects of film holes’ arrangements and jet Reynolds number on flow structure and heat transfer characteristics of jet impingement conjugated with film cooling in a semicylinder double wall channel. Design/methodology/approach: Numerical simulations are used in this research. Streamlines on different sections, skin-friction lines, velocity, wall shear stress and turbulent kinetic energy contours near the concave target wall and vortices in the double channel are presented. Local Nusselt number contours and surface averaged Nusselt numbers are also obtained. Topology analysis is applied to further understand the fluid flow and is used in analyzing the heat transfer characteristics.... (More)
Purpose: The purpose of this study is to investigate the effects of film holes’ arrangements and jet Reynolds number on flow structure and heat transfer characteristics of jet impingement conjugated with film cooling in a semicylinder double wall channel. Design/methodology/approach: Numerical simulations are used in this research. Streamlines on different sections, skin-friction lines, velocity, wall shear stress and turbulent kinetic energy contours near the concave target wall and vortices in the double channel are presented. Local Nusselt number contours and surface averaged Nusselt numbers are also obtained. Topology analysis is applied to further understand the fluid flow and is used in analyzing the heat transfer characteristics. Findings: It is found that the arrangement of side films positioned far from the center jets helps to enhance the flow disturbance and heat transfer behind the film holes. The heat transfer uniformity for the case of 55° films arrangement angle is most improved and the thermal performance is the highest in this study. Originality/value: The film holes’ arrangements effects on fluid flow and heat transfer in an impingement cooled concave channel are conducted. The flow structures in the channel and flow characteristics near target by topology pictures are first obtained for the confined film cooled impingement cases. The heat transfer distributions are analyzed with the flow characteristics. The highest heat transfer uniformity and thermal performance situation is obtained in present work.
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- author
- Qiu, Dandan LU ; Luo, Lei ; Zhao, Zhiqi LU ; Wang, Songtao ; Wang, Zhongqi and Sunden, Bengt Ake LU
- organization
- publishing date
- 2021
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Film cooling, Flow structure, Heat transfer, Jet impingement, Topology analysis
- in
- International Journal of Numerical Methods for Heat and Fluid Flow
- volume
- 31
- issue
- 12
- pages
- 3642 - 3660
- publisher
- Emerald Group Publishing Limited
- external identifiers
-
- scopus:85102713432
- ISSN
- 0961-5539
- DOI
- 10.1108/HFF-10-2020-0630
- language
- English
- LU publication?
- yes
- id
- b2c0df7b-12d1-468b-ac2d-754f5699d25c
- date added to LUP
- 2021-04-01 10:37:53
- date last changed
- 2023-11-08 12:10:26
@article{b2c0df7b-12d1-468b-ac2d-754f5699d25c,
abstract = {{<p>Purpose: The purpose of this study is to investigate the effects of film holes’ arrangements and jet Reynolds number on flow structure and heat transfer characteristics of jet impingement conjugated with film cooling in a semicylinder double wall channel. Design/methodology/approach: Numerical simulations are used in this research. Streamlines on different sections, skin-friction lines, velocity, wall shear stress and turbulent kinetic energy contours near the concave target wall and vortices in the double channel are presented. Local Nusselt number contours and surface averaged Nusselt numbers are also obtained. Topology analysis is applied to further understand the fluid flow and is used in analyzing the heat transfer characteristics. Findings: It is found that the arrangement of side films positioned far from the center jets helps to enhance the flow disturbance and heat transfer behind the film holes. The heat transfer uniformity for the case of 55° films arrangement angle is most improved and the thermal performance is the highest in this study. Originality/value: The film holes’ arrangements effects on fluid flow and heat transfer in an impingement cooled concave channel are conducted. The flow structures in the channel and flow characteristics near target by topology pictures are first obtained for the confined film cooled impingement cases. The heat transfer distributions are analyzed with the flow characteristics. The highest heat transfer uniformity and thermal performance situation is obtained in present work.</p>}},
author = {{Qiu, Dandan and Luo, Lei and Zhao, Zhiqi and Wang, Songtao and Wang, Zhongqi and Sunden, Bengt Ake}},
issn = {{0961-5539}},
keywords = {{Film cooling; Flow structure; Heat transfer; Jet impingement; Topology analysis}},
language = {{eng}},
number = {{12}},
pages = {{3642--3660}},
publisher = {{Emerald Group Publishing Limited}},
series = {{International Journal of Numerical Methods for Heat and Fluid Flow}},
title = {{On heat transfer and flow characteristics of jets impinging onto concave surface with varying bleeding arrangements}},
url = {{http://dx.doi.org/10.1108/HFF-10-2020-0630}},
doi = {{10.1108/HFF-10-2020-0630}},
volume = {{31}},
year = {{2021}},
}