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Flow Characteristics and Heat Transfer of Supercritical n-decane in Novel Nested Channels for Scramjet Regenerative Cooling

Li, Yong LU orcid ; Xie, Gongnan LU ; Zhang, Yingchun ; Ferla, Paolo LU and Sunden, Bengt LU (2021) In International Journal of Heat and Mass Transfer 167.
Abstract

A novel kind of regenerative cooling channel, a so-called nested channel, is proposed to further reduce the combustion chamber wall temperature of a scramjet. The supercritical n-decane heat transfer in the horizontal up-channel and horizontal down-channel with different flow directions are numerically investigated. The temperature distribution, flow field, and vortex structure are presented to discuss the thermal performance and flow characteristics. It is found that the nested channel with the same flow direction performs well particularly for the up-channel with the gravity direction points at the heated wall, and the vortices induced by the gravity are beneficial to the heat transfer performance. This feature is also confirmed by... (More)

A novel kind of regenerative cooling channel, a so-called nested channel, is proposed to further reduce the combustion chamber wall temperature of a scramjet. The supercritical n-decane heat transfer in the horizontal up-channel and horizontal down-channel with different flow directions are numerically investigated. The temperature distribution, flow field, and vortex structure are presented to discuss the thermal performance and flow characteristics. It is found that the nested channel with the same flow direction performs well particularly for the up-channel with the gravity direction points at the heated wall, and the vortices induced by the gravity are beneficial to the heat transfer performance. This feature is also confirmed by the Case B1 (up-channel, parallel-flow) with the n-decane flowing into the heated wall assisted by the nesting inner channel taking more heat away.

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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Gravity direction, Nested channel, Supercritical n-decane, Thermal acceleration, Vortex structure
in
International Journal of Heat and Mass Transfer
volume
167
article number
120836
publisher
Pergamon Press Ltd.
external identifiers
  • scopus:85098736585
ISSN
0017-9310
DOI
10.1016/j.ijheatmasstransfer.2020.120836
language
English
LU publication?
yes
id
887f425c-f27f-4f1a-9c47-ba3dfe410cca
date added to LUP
2021-01-13 09:33:29
date last changed
2023-11-20 20:26:28
@article{887f425c-f27f-4f1a-9c47-ba3dfe410cca,
  abstract     = {{<p>A novel kind of regenerative cooling channel, a so-called nested channel, is proposed to further reduce the combustion chamber wall temperature of a scramjet. The supercritical n-decane heat transfer in the horizontal up-channel and horizontal down-channel with different flow directions are numerically investigated. The temperature distribution, flow field, and vortex structure are presented to discuss the thermal performance and flow characteristics. It is found that the nested channel with the same flow direction performs well particularly for the up-channel with the gravity direction points at the heated wall, and the vortices induced by the gravity are beneficial to the heat transfer performance. This feature is also confirmed by the Case B1 (up-channel, parallel-flow) with the n-decane flowing into the heated wall assisted by the nesting inner channel taking more heat away.</p>}},
  author       = {{Li, Yong and Xie, Gongnan and Zhang, Yingchun and Ferla, Paolo and Sunden, Bengt}},
  issn         = {{0017-9310}},
  keywords     = {{Gravity direction; Nested channel; Supercritical n-decane; Thermal acceleration; Vortex structure}},
  language     = {{eng}},
  publisher    = {{Pergamon Press Ltd.}},
  series       = {{International Journal of Heat and Mass Transfer}},
  title        = {{Flow Characteristics and Heat Transfer of Supercritical n-decane in Novel Nested Channels for Scramjet Regenerative Cooling}},
  url          = {{http://dx.doi.org/10.1016/j.ijheatmasstransfer.2020.120836}},
  doi          = {{10.1016/j.ijheatmasstransfer.2020.120836}},
  volume       = {{167}},
  year         = {{2021}},
}