Calculated Nitric Oxide Emissions of an Unthrottled Spark Ignited, Stratified Charge Internal Combustion Engine 741171
This paper presents a theoretical study of nitric oxide emissions from an unthrottled stratified charge, spark ignition engine. This investigation was undertaken to determine the nitric oxide production when an ideal rich-lean stratification is present and to determine the effects of introducing an intermediate stoichiometric region. In order to study this problem a three-region (generally rich, stoichiometric, and lean) combustion model was used, and the effects of the following variables were studied:
Excess air number of the rich mixture.
Percentage of the total fuel in the rich-mixture region.
Percentage of fuel burned stoichiometrically.
Exhaust gas recirculation, percentage and distribution.
Comparisons are made to both experimental results from a throttled engine and calculated results for an unthrottled engine with a homogeneous mixture. For illustrative purposes, an application of the model to a particular geometrical form of charge distribution is analyzed.
Citation: Tabaczynski, R. and Klomp, E., "Calculated Nitric Oxide Emissions of an Unthrottled Spark Ignited, Stratified Charge Internal Combustion Engine," SAE Technical Paper 741171, 1974, https://doi.org/10.4271/741171. Download Citation
Rodney J. Tabaczynski, Edward D. Klomp
Research Lab., div., General Motors Corp.
International Stratified Charge Engine Conference
Spark ignition engines
Exhaust gas recirculation (EGR)
Combustion and combustion processes
Subscribers can view annotate, and download all of SAE's content.
Learn More »