A multifluid Taylor-Galerkin methodology for the simulation of compressible multicomponent separate two-phase flows from subcritical to supercritical states
Résumé
In various industrial combustion devices, such as liquid rocket engines at ignition or Diesel engines during the compression stage, the operating point varies over a wide range of pressures. These pressure variations can lead to a change of thermodynamic regime when the critical pressure is exceeded, switching from two-phase injection to transcritical injection. Such change modifies the topology of the flow and the mixing, thereby impacting the flame dynamics. This motivates the development of a unified methodology able to address both subcritical and supercritical flows within the same solver. To achieve this, the present work provides an extension of the supercritical real gas Taylor-Galerkin solver AVBP-RG to subcritical two-phase flows, based on diffuse interface models. In particular, the required developments for the integration of a multifluid model into the finite-element framework of this solver are detailed. Then, the ability of the solver to address a subcritical configuration is tested by simulating two subcritical-pressure operating points (G1 at 4.7 MPa and A10 at 1 MPa) of the MASCOTTE test bench operated by ONERA. This allows to confront the model with experimental data, showing good agreement.
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