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Establishing New Correlations Between In-Cylinder Charge Motion and Combustion Process in Gasoline Engines Through a Numerical DOE
Abstract:
This paper presents an innovative methodology and the corresponding results of a study whose goal is to identify the main links between in-cylinder charge motion and the development of combustion without taking into consideration how to create this charge motion (shape of the intake ducts, valve timing,
etc
…).
During this study a specific methodology was developed and used. It is based on the calculation of a “3D numerical test bench” matrix planned following the Design Of Experiments method. Many aerodynamic configurations obtained by combining the three main aerodynamic motions with several different intensities (tumble, cross-tumble or swirl) at the intake valve closing were calculated.
The results obtained allow on the one hand to validate and to extend some correlations between in-cylinder charge motion and combustion found in the literature and on the other hand to highlight new links between macroscopic aerodynamics and the quantities related to the combustion velocity, timing and efficiency.