TY - GEN
T1 - Detached Eddy simulation of combustion dynamics in scramjet combustors
AU - Choi, Jeong Yeol
AU - Yang, Vigor
AU - Ma, Fuhua
AU - Won, Su Hee
AU - Jeung, In Seuck
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2007
Y1 - 2007
N2 - A comprehensive numerical analysis of scramjet combustor has been carried out for reacting flows in constant-area channel type and divergent nozzle type combustors with and without a cavity. Hydrogen fuel is transversely injected into the supersonic combustor with a broad range of injection pressure. The corresponding equivalence ratio of the overall fuel/air mixture ranges from 0.167 to 0.50. To this end, a DES (Detached Eddy Simulation) turbulence model was applied to a scramjet combustor using compressible Navier-Stokes equations with a detailed chemistry mechanism for hydrogen combustion. Solutions were post-processed by time averaging techniques. Present work exhibits the detailed resolution of flow and flame dynamics of supersonic combustor, which were not typically available in most of the previous studies. In particular, the oscillatory and time averaged flow characteristics are captured at a scale sufficient to identify the underlying physical mechanisms. Results indicate that much of flow unsteadiness is related not only to the cavity, but also to the intrinsic unsteadiness in the flowfield. The interactions between the unsteady flow and flame evolution may cause a large excursion of flow oscillation. The unsteady simulation shows the time-evolving process of combustor choking of the constant area combustor. The averaged field for the nozzle type combustor shows the overall characteristics of the stabilized oscillating combustion. The roles of the cavity, combustor divergence, injection pressure, and heat release in determining the flow dynamics could be examined systematically from the averaged field.
AB - A comprehensive numerical analysis of scramjet combustor has been carried out for reacting flows in constant-area channel type and divergent nozzle type combustors with and without a cavity. Hydrogen fuel is transversely injected into the supersonic combustor with a broad range of injection pressure. The corresponding equivalence ratio of the overall fuel/air mixture ranges from 0.167 to 0.50. To this end, a DES (Detached Eddy Simulation) turbulence model was applied to a scramjet combustor using compressible Navier-Stokes equations with a detailed chemistry mechanism for hydrogen combustion. Solutions were post-processed by time averaging techniques. Present work exhibits the detailed resolution of flow and flame dynamics of supersonic combustor, which were not typically available in most of the previous studies. In particular, the oscillatory and time averaged flow characteristics are captured at a scale sufficient to identify the underlying physical mechanisms. Results indicate that much of flow unsteadiness is related not only to the cavity, but also to the intrinsic unsteadiness in the flowfield. The interactions between the unsteady flow and flame evolution may cause a large excursion of flow oscillation. The unsteady simulation shows the time-evolving process of combustor choking of the constant area combustor. The averaged field for the nozzle type combustor shows the overall characteristics of the stabilized oscillating combustion. The roles of the cavity, combustor divergence, injection pressure, and heat release in determining the flow dynamics could be examined systematically from the averaged field.
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M3 - Conference contribution
AN - SCOPUS:36748998835
SN - 1563479036
SN - 9781563479038
T3 - Collection of Technical Papers - 43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference
SP - 231
EP - 237
BT - Collection of Technical Papers - 43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference
PB - American Institute of Aeronautics and Astronautics Inc.
T2 - 43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference
Y2 - 8 July 2007 through 11 July 2007
ER -