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- W2318474051 abstract "coecients and high density. All computations have been performed with supercritical methane (p=150 bar, T=300 K), while for the oxygen jet both trans-critical and supercritical conditions have been studied (p=150 bar, T=90-300 K). High pressure conditions have been modelled using real gas transport and thermodynamic properties, and the Lee-Kesler equation of state based on the principle of corresponding states. Because the Reynolds number of the co-flowing oxygen and methane jets is very high ( 10 6 and higher), SGS modelling is critical. The SGS turbulence model (Fractal Model = FM) developed by this research group plays a special role. It assumes a local cascade of enstrophy down to the dissipative turbulent scales with locally-varying fractal dimensions, which enables estimating the local flame surface area (or the reacting volume of the flame structure) using fractal geometry assumptions. The FM is also used to estimate a turbulent viscosity acting on the mean flow as well as the turbulent Prandtl and Schmidt numbers. SGS combustion is modelled using an Eddy Dissipation Concept: the propellants are well mixed at small scales and the reaction rate is related to the local small scale volume fraction, so that any type of kinetics may be incorporated in the SGS model. The data processing is directed to identify turbulence structures, flameholding eects of the LOx post tip, recess mixing enhancement and characteristic times for mixing and combustion. In particular, a crucial role is found to be played by the momentum flux ratio (M) which determines the mixing regime." @default.
- W2318474051 created "2016-06-24" @default.
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- W2318474051 date "2004-01-05" @default.
- W2318474051 modified "2023-09-23" @default.
- W2318474051 title "Mixing and Combustion in Supercritical O2/CH4 Liquid Rocket Injectors" @default.
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- W2318474051 doi "https://doi.org/10.2514/6.2004-1163" @default.
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