Y. Beauge’s research while affiliated with Groupe PSA and other places

The resonant oscillation of burned gases in the combustion chamber of direct injection (DI) diesel engines appears to be the main excitation source of the engine block during combustion. This has led to the application of different techniques in order to study its generation mechanisms and to determine its relationship with combustion parameters such as bowl geometry, type of injector, injection parameters, etc. In this paper, a numerical methodology for the analysis of combustion chamber resonances is proposed. The numerical approach is validated by comparison with results from modal theory in a simple case. Then, this technique has been applied to the analysis of three different bowls, indicating their potential for the control of combustion chamber resonances.

The resonance due to the oscillation of burned gases in the combustion chamber is particularly important in DI diesel engines because it appears to be the main excitation source of the engine block during the combustion process. This fact has induced researchers to the application of different techniques in order to study its generation mechanisms and to determine its dependence on combustion parameters such as bowl geometry, type of injector, injection settings, etc. In this work, a methodology that contributes to such studies is proposed, in which a CFD approach and results from modal theory are used. First, these techniques are evaluated and verified in a simple case. Then, they have been applied to the analysis of multi-ignition zones and three different bowl geometries, indicating their potential for the control of combustion chamber resonances.