Large eddy simulations of reacting and non-reacting transcritical fuel sprays using multiphase thermodynamics
Abstract
We present a novel framework for high-fidelity simulations of inert and reacting sprays at transcritical conditions with highly accurate and computationally efficient models for complex real-gas effects in high-pressure environments, especially for the hybrid subcritical/supercritical mode of evaporation during the mixing of fuel and oxidizer. The high-pressure jet disintegration is modeled using a diffuse interface method with multiphase thermodynamics, which combines multi-component real-fluid volumetric and caloric state equations with vapor-liquid equilibrium calculations for the computation of thermodynamic properties of mixtures at transcritical pressures. Combustion source terms are evaluated using a finite-rate chemistry model, including real-gas effects based on the fugacity of the species in the mixture. The adaptive local deconvolution method is used as a physically consistent turbulence model for large eddy simulation (LES). The proposed method represents multiphase turbulent fluid flows at transcritical pressures without relying on any semi-empirical breakup and evaporation models. All multiphase thermodynamic model equations are presented for general cubic state equations coupled with a rapid phase-equilibrium calculation method that is formulated in a reduced space based on the molar specific volume function. LES results show a very good agreement with available experimental data for the reacting and non-reacting engine combustion network benchmark spray A at transcritical operating conditions.
- Publication:
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Physics of Fluids
- Pub Date:
- August 2022
- DOI:
- 10.1063/5.0099154
- arXiv:
- arXiv:2205.07504
- Bibcode:
- 2022PhFl...34h5131F
- Keywords:
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- Physics - Fluid Dynamics;
- Nonlinear Sciences - Adaptation and Self-Organizing Systems;
- Physics - Applied Physics;
- Physics - Computational Physics
- E-Print:
- This paper is part of the Physics of Fluids themed issue Development and Validation of Models for Turbulent Reacting Flows in honor of Professor Michael Pfitzner on the occasion of his retirement