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Calculated Nitric Oxide Emissions of an Unthrottled Spark Ignited, Stratified Charge Internal Combustion Engine
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English
Abstract
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:
- 1.Excess air number of the rich mixture.
- 2.Percentage of the total fuel in the rich-mixture region.
- 3.Percentage of fuel burned stoichiometrically.
- 4.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.
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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.Also In
References
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- Wiebe J. J. “Das Wiebe-Brenngesetz, ein Fortschritt in der Thermodynamik der Kreisprozesse von Verbrennungsmotoren.” Janet A. Prof. Dresden T. H. 9 1960
- Lavoie George E. Heywood John B. James C. “Experimental and Theoretical Study of Nitric Oxide Formation in Internal Combustion Engines.” Comb. Sci. and Tech. 1 1970 313
- Blumberg P. Kummer J. T. “Prediction of NO Formation in Spark Ignition Engines-An Analysis of Methods of Control.” Comb. Sci. and Tech. 4 1971 73 95