Multidimensional Modeling of Internal Combustion Engine Processes

Abstract

A 2D simulation of an engine was carried out for at piston, at cylinder head and hemispherical cylinder head. The report reviews the Multidimensional modeling of an internal combustion engine with at piston and at cylinder head. This report represents the literature review for the topic and di erent models were considered. The modeling of the geometry have been done in Gambit 2.2 and CFD based simu- lation have been done in Fluent 6.2. Geometries with at and hemispherical cylinder head is taken into account for simulation. The engine is considered in motored con- dition in case 1 to 7 and case 9 . In case 8 and Case 10 , modeling of engine have been done with premixed combustion. The standard k-" model is used for modeling the turbulence. The spark ignition model and premixed combustion model is used for premixed combustion modeling. The result shows the effect of engine speed on turbulence kinetic energy and analysis of premixed combustion modeling with spark ingnition model. Results indicates that in suction process the high turbulence is set in due to the shear layer in the high velocity jet entering the engine cylinder. The turbulence uctuation increase and approximately go with the high piston speed and valve lift. There will be fall in turbulence with the closure of inlet valve. During the compression process, turbulence suddenly decreases due to wall interactions.