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Article Dans Une Revue IJRRAS Année : 2018

THEORETICAL PLASMA CHARACTERIZATION DURING CURRENT PULSE

Résumé

The economic/ecological contexts and the CO2 regulation lead the automotive industry to improve the spark ignited engines. A way of improvement is the admission of a lean mixture or of a diluted mixture by recirculation of exhaust gases in the combustion chamber. The main difficulty in these conditions is to start the combustion. To overcome this problem, ignition systems are studied and more particularly the spark one. This discharge leads to the apparition of plasma and the understanding of the energy transfer mechanisms between this plasma and the reactive mixture is essential. This work is focus on the modeling of a spark during its electrical arc phase in order to predict the hydrodynamic behavior of the arc and the shock wave propagation. The difficulty on the choice of initial conditions for the model is highlighted. A two dimensional model based on ANSYS Fluent software is developed. This model allows us to show the role of each initial parameter as well as their impacts on the plasma flow. One calculation case presents the shock wave propagation and the plasma kernel. Finally a parametric study is presented. Without a complete model describing all the phases of the spark the choice of initial conditions is essential, nevertheless experimental measurements are difficult to perform. The interdependence of the initial parameters is demonstrated and care is needed in case of incomplete set of initial conditions which should be completed.
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Dates et versions

hal-02324931 , version 1 (22-10-2019)

Identifiants

  • HAL Id : hal-02324931 , version 1

Citer

Malyk Benmouffok, Pierre Freton, Jean Jacques Gonzalez. THEORETICAL PLASMA CHARACTERIZATION DURING CURRENT PULSE. IJRRAS, 2018, 34. ⟨hal-02324931⟩
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