Diffuse interface models and adapted numerical schemes for the simulation of subcritical to supercritical flows

M Pelletier - 2019 - hal.science
M Pelletier
2019hal.science
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.
This change modifies the topology of the flow and the mixing, thereby impacting the flame
dynamics. The objective of the present Ph. D thesis is to develop an original methodology …
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. This change modifies the topology of the flow and the mixing, thereby impacting the flame dynamics. The objective of the present Ph.D thesis is to develop an original methodology able to address both subcritical and supercritical flows within the same solver. To achieve this, an extension of the real gas solver AVBP-RG to subcritical two-phase flows is provided, based on diffuse interface models. The required developments for the integration of such models into the finite-element framework of the solver are provided. Multidimensional numerical simulations are led in order to confront the model with experimental data, with which good agreement is observed. These results offer encouraging perspectives regarding further enhancements of the model and applications to complex industrial cases.
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