This paper analyzes quantitatively mechanisms and its effects of reducing simultaneously NOx/fuel-consumption taking the focus on torch-jet lean combustion control modeling in a pre-chamber type stratified-charge approach with actual Honda CVCC engine test examples.
For analyzing the NO x /fuel consumption reduction mechanism and effects, so-called phenomenological modeling centering around torch-flame-jet behavior are examined with varying the design factors such as auxiliary chamber volume/torch nozzle area.
Then, main physical features and those characteristics of torch-flame-jet such as the combustion pressure rise histories in pre-chamber, penetration length/volume/speed of torch-jet in lean mixture of main chamber, lean mixture shear-flow entrainment and turbulence enhancing effects induced by torch-jet are computed with numerical methods and those various effects for the lean ignition/combustion are examined.
Finally, verifications are attempted by comparison with real engine tested results which specific CO/HC/NOx, fuel-consumption in[gr/PSi-hr] are measured with varying design factors such as pre-chamber volume/torch nozzle area, and trends coincidence are verified sufficiently with computational results.