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      Large-Eddy Simulation of Coaxial LN2/GH2 Injection at Trans- and Supercritical Conditions

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          Abstract

          Large-eddy simulations are carried out for the coaxial injection of liquid nitrogen and preheated hydrogen at supercritical pressures. The conditions are similar to that in typical liquid-propellant rocket combustors. By using nitrogen as a model gas, the mixing process is studied without the interference with chemical reactions. An analysis of the thermodynamic conditions that arise in the shear layer reveals that local phase separation may occur if the injection condition is transcritical. A novel volume-translation method on the basis of the cubic Peng–Robinson equation of state is introduced for the use in multispecies large-eddy simulations and is tested for both trans- and supercritical injection conditions. The new thermodynamic model corrects the deficiencies of the Peng–Robinson equation of state in the transcritical regime at minimal extra computational cost. Two independently developed large-eddy simulation codes are used for the simulations and the results are compared. The outcome indicates that the flowfield is mainly controlled by the turbulence on the resolved scales, and an accurate model for the fluid’s thermodynamic state is more important than the subgrid-scale turbulence model or the details of the code architecture. A comparison with available experimental data shows that important flow features are well predicted.

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          Most cited references38

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          A New Two-Constant Equation of State

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                Author and article information

                Conference
                jpp
                Journal of Propulsion and Power
                J. Propulsion
                American Institute of Aeronautics and Astronautics
                0748-4658
                1533-3876
                15 October 2015
                January–February 2016
                : 32
                : 1
                : 46-56
                Affiliations
                Thermodynamics Institute, Universität der Bundeswehr München , 85577 Neubiberg, Germany
                Institute of Aerodynamics and Fluid Mechanics, Institute of Aerodynamics and Fluid Mechanics, Technische Universität München , 85748 Garching bei München, Germany
                Author notes
                [*]

                Research Associate, Thermodynamics Institute, Werner-Heisenberg-Weg 39; hagen.mueller@ 123456unibw.de .

                [†]

                Full Professor, Thermodynamics Institute, Werner-Heisenberg-Weg 39; michael.pfitzner@ 123456unibw.de .

                [‡]

                Research Associate, Institute of Aerodynamics and Fluid Mechanics, Boltzmannstrasse 15; jan.matheis@ 123456tum.de .

                [§]

                Full Professor; also Faculty of Aerospace Engineering, Technische Universiteit Delft, Kluyverweg 1, 2629 HS Delft, The Netherlands; S.Hickel@ 123456tudelft.nl .

                Article
                B35827 B35827
                10.2514/1.B35827
                25d3978f-522f-45cb-9427-12b01728fc47
                Copyright © 2015 by H. Müller, J. Matheis, S. Hickel, and M. Pfitzner. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. Copies of this paper may be made for personal or internal use, on condition that the copier pay the $10.00 per-copy fee to the Copyright Clearance Center, Inc., 222 Rosewood Drive, Danvers, MA 01923; include the code 1533-3876/15 and $10.00 in correspondence with the CCC.
                History
                : 31 March 2015
                : 17 August 2015
                : 18 August 2015
                Page count
                Figures: 10, Tables: 2
                Categories
                Full-Length Paper

                Engineering,Physics,Mechanical engineering,Space Physics
                Engineering, Physics, Mechanical engineering, Space Physics

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