Simulation of a GOx-GCH4 Rocket Combustor and the Effect of the GEKO Turbulence Model Coefficients

In this study, a single injector methane-oxygen rocket combustor is numerically studied. The simulations included in this study are based on the hardware and experimental data from the Technical University of Munich. The focus is on the recently developed generalized <i>k–ω</i> turbulenc...

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Autores principales:	Evgeny Strokach, Victor Zhukov, Igor Borovik, Andrej Sternin, Oscar J. Haidn
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	GEKO turbulence model methane rocket engine wall heat flux single coaxial injector RAMEC mechanism Zhukov-Kong mechanism Motor vehicles. Aeronautics. Astronautics TL1-4050
Acceso en línea:	https://doaj.org/article/9e1c94f5edcb4b8b945cb7683e7eec6f
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id	oai:doaj.org-article:9e1c94f5edcb4b8b945cb7683e7eec6f
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spelling	oai:doaj.org-article:9e1c94f5edcb4b8b945cb7683e7eec6f2021-11-25T15:57:42ZSimulation of a GOx-GCH4 Rocket Combustor and the Effect of the GEKO Turbulence Model Coefficients10.3390/aerospace81103412226-4310https://doaj.org/article/9e1c94f5edcb4b8b945cb7683e7eec6f2021-11-01T00:00:00Zhttps://www.mdpi.com/2226-4310/8/11/341https://doaj.org/toc/2226-4310In this study, a single injector methane-oxygen rocket combustor is numerically studied. The simulations included in this study are based on the hardware and experimental data from the Technical University of Munich. The focus is on the recently developed generalized <i>k–ω</i> turbulence model (GEKO) and the effect of its adjustable coefficients on the pressure and on wall heat flux profiles, which are compared with the experimental data. It was found that the coefficients of ‘jet’, ‘near-wall’, and ‘mixing’ have a major impact, whereas the opposite can be deduced about the ‘separation’ parameter Csep, which highly influences the pressure and wall heat flux distributions due to the changes in the eddy-viscosity field. The simulation results are compared with the standard <i>k–ε</i> model, displaying a qualitatively and quantitatively similar behavior to the GEKO model at a Csep equal to unity. The default GEKO model shows a stable performance for three oxidizer-to-fuel ratios, enhancing the reliability of its use. The simulations are conducted using two chemical kinetic mechanisms: Zhukov and Kong and the more detailed RAMEC. The influence of the combustion model is of the same order as the influence of the turbulence model. In general, the numerical results present a good or satisfactory agreement with the experiment, and both GEKO at Csep = 1 or the standard <i>k–ε</i> model can be recommended for usage in the CFD simulations of rocket combustion chambers, as well as the Zhukov–Kong mechanism in conjunction with the flamelet approach.Evgeny StrokachVictor ZhukovIgor BorovikAndrej SterninOscar J. HaidnMDPI AGarticleGEKO turbulence modelmethane rocket enginewall heat fluxsingle coaxial injectorRAMEC mechanismZhukov-Kong mechanismMotor vehicles. Aeronautics. AstronauticsTL1-4050ENAerospace, Vol 8, Iss 341, p 341 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	GEKO turbulence model methane rocket engine wall heat flux single coaxial injector RAMEC mechanism Zhukov-Kong mechanism Motor vehicles. Aeronautics. Astronautics TL1-4050
spellingShingle	GEKO turbulence model methane rocket engine wall heat flux single coaxial injector RAMEC mechanism Zhukov-Kong mechanism Motor vehicles. Aeronautics. Astronautics TL1-4050 Evgeny Strokach Victor Zhukov Igor Borovik Andrej Sternin Oscar J. Haidn Simulation of a GOx-GCH4 Rocket Combustor and the Effect of the GEKO Turbulence Model Coefficients
description	In this study, a single injector methane-oxygen rocket combustor is numerically studied. The simulations included in this study are based on the hardware and experimental data from the Technical University of Munich. The focus is on the recently developed generalized <i>k–ω</i> turbulence model (GEKO) and the effect of its adjustable coefficients on the pressure and on wall heat flux profiles, which are compared with the experimental data. It was found that the coefficients of ‘jet’, ‘near-wall’, and ‘mixing’ have a major impact, whereas the opposite can be deduced about the ‘separation’ parameter Csep, which highly influences the pressure and wall heat flux distributions due to the changes in the eddy-viscosity field. The simulation results are compared with the standard <i>k–ε</i> model, displaying a qualitatively and quantitatively similar behavior to the GEKO model at a Csep equal to unity. The default GEKO model shows a stable performance for three oxidizer-to-fuel ratios, enhancing the reliability of its use. The simulations are conducted using two chemical kinetic mechanisms: Zhukov and Kong and the more detailed RAMEC. The influence of the combustion model is of the same order as the influence of the turbulence model. In general, the numerical results present a good or satisfactory agreement with the experiment, and both GEKO at Csep = 1 or the standard <i>k–ε</i> model can be recommended for usage in the CFD simulations of rocket combustion chambers, as well as the Zhukov–Kong mechanism in conjunction with the flamelet approach.
format	article
author	Evgeny Strokach Victor Zhukov Igor Borovik Andrej Sternin Oscar J. Haidn
author_facet	Evgeny Strokach Victor Zhukov Igor Borovik Andrej Sternin Oscar J. Haidn
author_sort	Evgeny Strokach
title	Simulation of a GOx-GCH4 Rocket Combustor and the Effect of the GEKO Turbulence Model Coefficients
title_short	Simulation of a GOx-GCH4 Rocket Combustor and the Effect of the GEKO Turbulence Model Coefficients
title_full	Simulation of a GOx-GCH4 Rocket Combustor and the Effect of the GEKO Turbulence Model Coefficients
title_fullStr	Simulation of a GOx-GCH4 Rocket Combustor and the Effect of the GEKO Turbulence Model Coefficients
title_full_unstemmed	Simulation of a GOx-GCH4 Rocket Combustor and the Effect of the GEKO Turbulence Model Coefficients
title_sort	simulation of a gox-gch4 rocket combustor and the effect of the geko turbulence model coefficients
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/9e1c94f5edcb4b8b945cb7683e7eec6f
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Simulation of a GOx-GCH4 Rocket Combustor and the Effect of the GEKO Turbulence Model Coefficients

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