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Energies 2014, 7(1), 477-497; doi:10.3390/en7010477

Application and Comparison of Different Combustion Models of High Pressure LOX/CH4 Jet Flames

* ,
Department Engineering for Innovation, University of Salento, via Monteroni, I-73100 Lecce, Italy
* Author to whom correspondence should be addressed.
Received: 18 December 2013 / Revised: 14 January 2014 / Accepted: 15 January 2014 / Published: 22 January 2014
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The present work focuses on the numerical modeling of combustion in liquid-propellant rocket engines. Pressure and temperature are well above thermodynamic critical points of both the propellants and then the reactants show liquid-like characteristics of density and gas-like characteristics for diffusivity. The aim of the work is an efficient numerical description of the phenomena and RANS simulations were performed for this purpose. Hence, in the present work different kinetics, combustion models and thermodynamic approaches were used for combustion modeling first in a trans-critical environment, then in the sub-critical state. For phases treatment the pure Eulerian single phase approach was compared with the Lagrangian/Eulerian description. For modeling combustion, the Probability Density Function (PDF) equilibrium and flamelet approaches and the Eddy Dissipation approach, with two different chemical kinetic mechanisms (the Jones-Lindstedt and the Skeletal model), were used. Real Gas (Soave-Redlich-Kwong and Peng-Robinson) equations were applied. To estimate the suitability of different strategies in phenomenon description, a comparison with experimental data from the literature was performed, using the results for different operative conditions of the Mascotte test bench: trans-critical and subcritical condition for oxygen injection. The main result of this study is the individuation of the DPM approach of the most versatile methods to reproduce cryogenic combustion adapted for different operating conditions and producing good results.
Keywords: cryogenic; rocket; combustion; Mascotte; methane; oxygen; CFD cryogenic; rocket; combustion; Mascotte; methane; oxygen; CFD
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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De Giorgi, M.G.; Sciolti, A.; Ficarella, A. Application and Comparison of Different Combustion Models of High Pressure LOX/CH4 Jet Flames. Energies 2014, 7, 477-497.

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