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Detailed Hydrocarbon Species and Particulate Emissions from a HCCI Engine as a Function of Air-Fuel Ratio
Technical Paper
2005-01-3749
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Concentrations of individual species in the engine-out exhaust gas from a gasoline-fueled (101.5 or 91.5 RON), direct-injection, compression-ignition (HCCI) engine have been measured by gas chromatography over the A/F range 50 to 230 for both stratified and nearly homogeneous fuel-air mixtures. The species identified include hydrocarbons, oxygenated organic species, CO, and CO2. A single-cylinder HCCI engine (CR = 15.5) with heated intake charge was used. Measurements of the mass and size distribution of particulate emissions were also performed.
The 101.5 RON fuel consisted primarily of five species, simplifying interpretation of the exhaust species data: iso-pentane (24%), iso-octane (22%), toluene (17%), xylenes (10%), and trimethylbenzenes (9%). The thermal oxidation of iso-pentane and iso-octane were studied individually during brief experiments in a Pyrex reactor in order to ascertain the major primary and secondary products formed during oxidation of these fuel components at 765 K.
A sharp increase occurs in the emissions indices of the organics formed by the combustion of the major fuel components beginning near A/F = 70. These product mole fractions increase by factors of 15 to 40 as the A/F ratio becomes leaner while unburned fuel species mole fractions increase by factors of 2 to 3. As observed previously in this engine and by others, the CO mole fraction increases sharply beginning near A/F = 70.
The size distribution of the particulate emissions for A/F < 70 is characteristic of soot emission, while for A/F > 70, the distribution changes sharply to that characteristic of semi-volatile particles.
The body of data, including detailed examination of the cylinder pressure traces, indicate that a significant change occurs in the nature of the combustion process near A/F =70.
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Kaiser, E., Matti Maricq, M., Xu, N., and Yang, J., "Detailed Hydrocarbon Species and Particulate Emissions from a HCCI Engine as a Function of Air-Fuel Ratio," SAE Technical Paper 2005-01-3749, 2005, https://doi.org/10.4271/2005-01-3749.Also In
References
- Kaiser, E. W. Yang, J. Culp, T. Xu, N. Maricq, M. M. “Homogeneous charge compression ignition engine-out emissions - does flame propagation occur in homogeneous charge compression ignition?” Int. J. Engine Research 3 185 2002
- Yang, J. Culp, T. Kenney, T. “Development of a gasoline engine system using HCCI technology - The concept and test results,” SAE Tech. Pap. Ser. 2002-01-2832 2002
- Kaiser, E. W. Siegl, W. O. “High resolution gas chromatographic determination of the atmospheric reactivity of engine-out hydrocarbon emissions from a spark-ignited engine” J. High Resolution Chromatography 17 264 270 1994
- Dec, J. E. Sjoberg, M. “A parametric study of HCCI combustion - the sources of emissions at low loads and the effect of GDI fuel injection,” SAE Tech. Pap. Ser. 2003-01-0752 2003
- Sjoberg, M. Dec, J. E. “Combined effects of fuel-type and engine speed on intake temperature requirements and completeness of bulk-gas reactions for HCCI combustion,” SAE Tech. Pap. Ser. 2003-01-3173 2003
- Aroonsrisopon, T. Werner, P. Waldman, J. O. Sohm, V. Foster, D. E. Morikawa, T. Iida, M. “Expanding the HCCI operation with the charge stratification” SAE Tech. Pap. Ser. 2004-01-1756 2004
- Kaiser, E. W. Siegl, W. O. Brehob, D. D. Haghgooie, M. “Engine-out emissions from a direct-injection spark-ignition (DISI) engine,” SAE Tech. Pap. Ser. 1999-01-1529 1999
- Maricq, M. M. Podsiadlik, D. H. Brehob, D. D. Haghgooie, M. “Particulate emissions from a direct-injection spark-ignition (DISI) engine” SAE Tech. Pap. Ser. 1999-01-1530 1999
- Wooldridge, S. Lavoie, G. Weaver, C. “Convection Path for Soot and Hydrocarbon Emissions from the Piston Bowl of a Stratified Charge Direct Injection Engine,” Proc. of the Third Joint Meeting of the US Sections of the Combustion Institute Chicago 2003
- Han, Z. Weaver, C. Wooldridge, S. Alger, T. Hilditch, J. McGee, J. Westrate, B. Xu, Z. Yi, J. Chen, X. Trigui, N. Davis, G. “Development of a new light stratified-charge DISI combustion system for a family of engines with upfront CFD coupling with thermal and optical engine experiments” SAE Tech. Pap. Ser. 2004-01-0545 2004