Computer simulation of combustion in a stratified charge engine

A two-dimensional (axisymmetric), time-dependent simulation of the compression and power strokes of a divided-chamber stratified charge engine based on an axisymmetric approximation to the Honda CVCC configuration has been performed. Global methane/air kinetics and constant turbulent diffusivities have been employed. Results indicate that significant variations in the CH 4 /air equivalence ratio occur near the spark plug as a result of the velocity field induced by the moving piston. These variations could cause cycle-by-cycle variations in engine performance. Vortex-like motion induced by the piston is presented along with the spatial distribution of CH 4 , products, NO x , temperature and velocity at various times in the engine cycle. Unburned CH 4 is found in the prechamber at the end of the calculation.