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竖直矩形通道内超临界正癸烷振荡特性的大涡模拟

Li, Yong LU orcid ; Sun, Feng ; Xie, Gongnan LU ; Cao, Zhen LU and Fu, Jiahong LU (2022) In Nanjing Hangkong Hangtian Daxue Xuebao/Journal of Nanjing University of Aeronautics and Astronautics 54(2). p.281-289
Abstract

Active generative cooling based on supercritical hydrocarbon fuel is regarded as one of the most promising methods for scramjet thermal management. A large eddy simulation method is used to explore the transient change law of the initial flow, and heat transfer behaviors of supercritical hydrocarbon fuel is in rectangular channels. An oscillation effect can be proved in the convective heat transfer process, i.e., the temperature and velocity distributions fluctuate strongly. By monitoring the velocity variation rule of 10-4 s time scale, the approximate trigonometric frequency and amplitude are present in this oscillation. At the initial heating condition, the high-temperature fluid, which is close to the heated wall, flows... (More)

Active generative cooling based on supercritical hydrocarbon fuel is regarded as one of the most promising methods for scramjet thermal management. A large eddy simulation method is used to explore the transient change law of the initial flow, and heat transfer behaviors of supercritical hydrocarbon fuel is in rectangular channels. An oscillation effect can be proved in the convective heat transfer process, i.e., the temperature and velocity distributions fluctuate strongly. By monitoring the velocity variation rule of 10-4 s time scale, the approximate trigonometric frequency and amplitude are present in this oscillation. At the initial heating condition, the high-temperature fluid, which is close to the heated wall, flows into the low-temperature region under the effect of buoyancy force. As the fluid temperature gradually reaches the pseudo-critical value, its thermo-physical properties change dramatically. The friction factor oscillates as well as the fluid kinetic energy. Correspondingly, the enhanced vortex is induced away from the heated wall. Over time, the enhanced vortex begins to move to the heated wall and the low-temperature fluid impinges on the wall. Consequently, the thermal transport is enhanced.

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Please use this url to cite or link to this publication:
author
; ; ; and
organization
alternative title
Large Eddy Simulation of Oscillation Characteristics of Supercritical n-Decane in Vertical Rectangular Channel
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Active generative cooling, Enhanced vortex, Large-eddy simulation, Oscillation effect
in
Nanjing Hangkong Hangtian Daxue Xuebao/Journal of Nanjing University of Aeronautics and Astronautics
volume
54
issue
2
pages
9 pages
publisher
Nanjing University of Aeronautics an Astronautics
external identifiers
  • scopus:85129414067
ISSN
1005-2615
DOI
10.16356/j.1005-2615.2022.02.014
language
Chinese (Simplified)
LU publication?
yes
id
f8e42e12-9f9e-4c0d-b4d2-6a3190030c81
date added to LUP
2022-07-08 11:19:56
date last changed
2023-11-21 08:29:39
@article{f8e42e12-9f9e-4c0d-b4d2-6a3190030c81,
  abstract     = {{<p>Active generative cooling based on supercritical hydrocarbon fuel is regarded as one of the most promising methods for scramjet thermal management. A large eddy simulation method is used to explore the transient change law of the initial flow, and heat transfer behaviors of supercritical hydrocarbon fuel is in rectangular channels. An oscillation effect can be proved in the convective heat transfer process, i.e., the temperature and velocity distributions fluctuate strongly. By monitoring the velocity variation rule of 10<sup>-4</sup> s time scale, the approximate trigonometric frequency and amplitude are present in this oscillation. At the initial heating condition, the high-temperature fluid, which is close to the heated wall, flows into the low-temperature region under the effect of buoyancy force. As the fluid temperature gradually reaches the pseudo-critical value, its thermo-physical properties change dramatically. The friction factor oscillates as well as the fluid kinetic energy. Correspondingly, the enhanced vortex is induced away from the heated wall. Over time, the enhanced vortex begins to move to the heated wall and the low-temperature fluid impinges on the wall. Consequently, the thermal transport is enhanced.</p>}},
  author       = {{Li, Yong and Sun, Feng and Xie, Gongnan and Cao, Zhen and Fu, Jiahong}},
  issn         = {{1005-2615}},
  keywords     = {{Active generative cooling; Enhanced vortex; Large-eddy simulation; Oscillation effect}},
  language     = {{chi}},
  number       = {{2}},
  pages        = {{281--289}},
  publisher    = {{Nanjing University of Aeronautics an Astronautics}},
  series       = {{Nanjing Hangkong Hangtian Daxue Xuebao/Journal of Nanjing University of Aeronautics and Astronautics}},
  title        = {{竖直矩形通道内超临界正癸烷振荡特性的大涡模拟}},
  url          = {{http://dx.doi.org/10.16356/j.1005-2615.2022.02.014}},
  doi          = {{10.16356/j.1005-2615.2022.02.014}},
  volume       = {{54}},
  year         = {{2022}},
}