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Effect of combustor geometry and fuel injection scheme on the combustion process in a supersonic flow

Cai, Zun; Wang, Zhenguo; Sun, Mingbo and Bai, Xue Song LU (2016) In Acta Astronautica 129. p.44-51
Abstract

The combustion process in a hydrogen fueled scramjet combustor with a rearwall-expansion cavity was investigated numerically under inflow conditions of Ma=2.52 with stagnation pressure P0=1.6 Mpa and stagnation temperature T0=1486 K. The numerical solver was first evaluated for supersonic reactive flows in a similar combustor configuration where experimental data is available. Wall-pressure distribution was compared with the experiments, and grid independency analysis and chemical mechanism comparison were conducted. The numerical results showed fairly good agreements with the available experimental data under supersonic combustion conditions. Then the numerical solver was used to study the effects of combustor... (More)

The combustion process in a hydrogen fueled scramjet combustor with a rearwall-expansion cavity was investigated numerically under inflow conditions of Ma=2.52 with stagnation pressure P0=1.6 Mpa and stagnation temperature T0=1486 K. The numerical solver was first evaluated for supersonic reactive flows in a similar combustor configuration where experimental data is available. Wall-pressure distribution was compared with the experiments, and grid independency analysis and chemical mechanism comparison were conducted. The numerical results showed fairly good agreements with the available experimental data under supersonic combustion conditions. Then the numerical solver was used to study the effects of combustor geometry, fuel injection scheme and injection equivalence ratio on the combustion process. It was found that under the same fuel injection condition, the combustor configuration with a rearwall-expansion cavity is in favor of the supersonic combustion mode and present better ability of thermal choking prevention than the other combustor configurations. For the rearwall-expansion cavity combustor, the supersonic flow field was found to be sensitive to the injector position and injection scheme, but not highly sensitive to the injection pressure. Besides, rearwall-expansion cavity with the combined fuel injection scheme (with an injection upstream the cavity and a direct injection on the rear wall) is an optimized injection scheme during the flame stabilization process.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Equivalence ratio, Fuel injection scheme, OpenFOAM, Optimization, Rearwall-expansion cavity
in
Acta Astronautica
volume
129
pages
8 pages
publisher
Elsevier
external identifiers
  • scopus:84990046236
  • wos:000389087900005
ISSN
0094-5765
DOI
10.1016/j.actaastro.2016.08.034
language
English
LU publication?
yes
id
c1c2f068-9864-4449-9ec8-8bb59c713fee
date added to LUP
2016-10-20 10:11:22
date last changed
2017-11-05 05:08:21
@article{c1c2f068-9864-4449-9ec8-8bb59c713fee,
  abstract     = {<p>The combustion process in a hydrogen fueled scramjet combustor with a rearwall-expansion cavity was investigated numerically under inflow conditions of Ma=2.52 with stagnation pressure P<sub>0</sub>=1.6 Mpa and stagnation temperature T<sub>0</sub>=1486 K. The numerical solver was first evaluated for supersonic reactive flows in a similar combustor configuration where experimental data is available. Wall-pressure distribution was compared with the experiments, and grid independency analysis and chemical mechanism comparison were conducted. The numerical results showed fairly good agreements with the available experimental data under supersonic combustion conditions. Then the numerical solver was used to study the effects of combustor geometry, fuel injection scheme and injection equivalence ratio on the combustion process. It was found that under the same fuel injection condition, the combustor configuration with a rearwall-expansion cavity is in favor of the supersonic combustion mode and present better ability of thermal choking prevention than the other combustor configurations. For the rearwall-expansion cavity combustor, the supersonic flow field was found to be sensitive to the injector position and injection scheme, but not highly sensitive to the injection pressure. Besides, rearwall-expansion cavity with the combined fuel injection scheme (with an injection upstream the cavity and a direct injection on the rear wall) is an optimized injection scheme during the flame stabilization process.</p>},
  author       = {Cai, Zun and Wang, Zhenguo and Sun, Mingbo and Bai, Xue Song},
  issn         = {0094-5765},
  keyword      = {Equivalence ratio,Fuel injection scheme,OpenFOAM,Optimization,Rearwall-expansion cavity},
  language     = {eng},
  month        = {12},
  pages        = {44--51},
  publisher    = {Elsevier},
  series       = {Acta Astronautica},
  title        = {Effect of combustor geometry and fuel injection scheme on the combustion process in a supersonic flow},
  url          = {http://dx.doi.org/10.1016/j.actaastro.2016.08.034},
  volume       = {129},
  year         = {2016},
}