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Partial-load and Start-up Operations of Spark-ignition Engine with Oxygen Enriched Air
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Abstract
Effects of the intake air oxygen enrichment (IOE) on the combustion processes and performance of a spark ignition (SI) engine were investigated when the engine was operated under part load conditions both after and during the warm-up period.
The study was performed by comparing the direct measurements of engine performance and emission characteristics with instantaneous digital imaging of in-cylinder reaction processes obtained using our high-speed dual-spectra infrared imaging system developed at Rutgers.
The IOE under the partial load operations of an SI engine produced some comparable improvements in the thermal efficiency and mean effective pressure to those from the full load operations. Although no dramatic reduction of unburned hydrocarbon emissions with the IOE was realized in the present measurement, the insignificant increase of Nox under the same condition is noteworthy.
On the other hand, the reduction of emission and increase in performance by the IOE during the warm up period were as comparably significant as those observed in the full throttle open operations.
The high-speed in-cylinder IR imaging obtained under corresponding conditions exhibits some consistency with the above findings. The instantaneous successive digital IR images did not show an obvious difference between those obtained with and without the IOE in the partial load experiment There was observable difference, however, in the results during the warm-up period: with the IOE, the combustion started earlier and burned stronger, which was followed by a shorter combustion period.
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Citation
Kajitani, S., Clasen, E., Campbell, S., and Rhee, K., "Partial-load and Start-up Operations of Spark-ignition Engine with Oxygen Enriched Air," SAE Technical Paper 932802, 1993, https://doi.org/10.4271/932802.Also In
References
- Kajitani, S. Sawa, N. McComiskey, T. Rhee, K.T. “A Spark Ignition Engine Operated by Oxygen Enriched Air,” SAE Paper- 922174 1992
- Willument, H.P. Bauer, M. “Emission and Performance of an SI Engine Inducting Oxygen-Enriched Combustion,” MTZ Mptrtechischrift 1989 49 149 152
- Hochmuth, J.K. Burk, P. Tolentino, C. Mignano, J. “Hydrocarbon Traps for Controlling Cold-Start Emissions,” SAE Paper- 930739 1993
- McComiskey, T. Jiang, H. Qian, Y. Rhee, K.T. Kent, J.C. “High-Speed Spectral IR Imaging of Spark Ignition Engine Combustion,” SAE Paper- 930865 1993
- Jiang, H. McComiskey, T. Qian, Y. Jeong, Y.I. Rhee, K.T. Kent J.C. “A New High-Speed Spectral Infrared Imaging Device Applied for Imaging Gaseous Mixtures from Combustion Devices,” Combustion Science and Technology 90 5-6 341 1993
- McComiskey, T. “An Experimental Investigation of a Spark Ignition Engine Using High Speed Spectral Infrared Digital Imaging,” Rutgers University January 1993