engleski

A New Quasi-Dimensional Flame Tracking Combustion Model for SI Engines

A new quasi-dimensional combustion model based on the multi-dimensional flame tracking approach was developed and integrated in AVL BOOST. The new quasi-dimensional flame tracking model (FTM) is able to simulate the turbulent combustion process of premixed mixtures. A new method for the description of geometry of the combustion chamber and flame front was developed enabling the visualization of flame front movement across the combustion chamber. The control of turbulence quantities in the flame front near the wall enables that the developed flame tracking model can predict the entire turbulent combustion process after the flame kernel development in spark-ignition (SI) engines. The developed quasi-dimensional combustion model was validated with the results of multi-dimensional flame tracking model of modern SI engine and with the experimental results of single cylinder SI engine. The model can also predict the cyclic combustion variability that can be triggered by the independent variations of flow angle at the spark plug, mixture stratification and in- cylinder turbulence level from cycle to cycle. It was shown that the FTM model is able to reproduce the local turbulence quantities and their distributions in the flame font which then contributes to a good agreement of simulation results with the 3D-CFD and experimental data. Due to low computational time the presented flame tracking model represents the well promising tool to calculate the turbulent combustion process in modern SI engines.

combustion, spark-ignition, quasi-dimensional, flame tracking

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