TY - JOUR
T1 - Large eddy simulation of flame structure and combustion mode in a hydrogen fueled supersonic combustor
AU - Huang, Zhi Wei
AU - He, Guo Qiang
AU - Qin, Fei
AU - Wei, Xiang Geng
N1 - Publisher Copyright:
© 2015 Hydrogen Energy Publications, LLC.
PY - 2015/8/17
Y1 - 2015/8/17
N2 - Abstract In this study, Large Eddy Simulation (LES) of supersonic turbulent mixing and combustion adopting a Partially Stirred Reactor (PaSR) sub-grid combustion model is performed for a hydrogen fueled model scramjet combustor. The compressible LES solver, which adopts a skeleton of 27 steps and 9 species hydrogen chemical kinetics model, is used to simulate the flowing and combustion processes based on structured hexahedral grids. The code is implemented in an Open Source Field Operation and Manipulation (OpenFOAM) solver, and validated against experimental data in terms of mean axial velocity and static temperature at different cross-sections, all show good predictions. An analysis of the flow field is carried out to investigate the supersonic turbulent flame structure and combustion mode in the combustor. Mixture fraction is extracted to indicate the reaction progress at different sites, which donates the most likely flame locations when at stoichiometric. Comparison of combustion parameters including OH mass fraction, scalar dissipation rate, flame index and heat release rate spatial distribution reveals that the supersonic combustion has the characteristics of a turbulent diffusion flame, where combustion is held at non-premixed mode controlled by turbulent mixing in the shear layers. A time scale analysis, the Damköhler Number is performed to examine these reactive zones in more detail. The role of auto-ignition in flame stabilization and lift-off is revealed.
AB - Abstract In this study, Large Eddy Simulation (LES) of supersonic turbulent mixing and combustion adopting a Partially Stirred Reactor (PaSR) sub-grid combustion model is performed for a hydrogen fueled model scramjet combustor. The compressible LES solver, which adopts a skeleton of 27 steps and 9 species hydrogen chemical kinetics model, is used to simulate the flowing and combustion processes based on structured hexahedral grids. The code is implemented in an Open Source Field Operation and Manipulation (OpenFOAM) solver, and validated against experimental data in terms of mean axial velocity and static temperature at different cross-sections, all show good predictions. An analysis of the flow field is carried out to investigate the supersonic turbulent flame structure and combustion mode in the combustor. Mixture fraction is extracted to indicate the reaction progress at different sites, which donates the most likely flame locations when at stoichiometric. Comparison of combustion parameters including OH mass fraction, scalar dissipation rate, flame index and heat release rate spatial distribution reveals that the supersonic combustion has the characteristics of a turbulent diffusion flame, where combustion is held at non-premixed mode controlled by turbulent mixing in the shear layers. A time scale analysis, the Damköhler Number is performed to examine these reactive zones in more detail. The role of auto-ignition in flame stabilization and lift-off is revealed.
KW - Combustion mode
KW - Flame structure
KW - Large eddy simulation
KW - PaSR combustion model
KW - Supersonic combustor
UR - http://www.scopus.com/inward/record.url?scp=84938209312&partnerID=8YFLogxK
U2 - 10.1016/j.ijhydene.2015.06.011
DO - 10.1016/j.ijhydene.2015.06.011
M3 - 文章
AN - SCOPUS:84938209312
SN - 0360-3199
VL - 40
SP - 9815
EP - 9824
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
IS - 31
M1 - 16086
ER -
