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An Experimental Study on the Effect of EGR and Engine Speed on CO and HC Emissions of Dual Fuel HCCI Engine
Abstract:In this study, effects of EGR on CO and HC emissions of a dual fuel HCCI-DI engine are investigated. Tests were conducted on a single-cylinder variable compression ratio (VCR) diesel engine with compression ratio of 17.5. Premixed gasoline is provided by a carburetor connected to intake manifold and equipped with a screw to adjust premixed air-fuel ratio, and diesel fuel is injected directly into the cylinder through an injector at pressure of 250 bars. A heater placed at inlet manifold is used to control the intake charge temperature. Optimal intake charge temperature was 110-115ºC due to better formation of a homogeneous mixture causing HCCI combustion. Timing of diesel fuel injection has a great effect on stratification of in-cylinder charge in HCCI combustion. Experiments indicated 35 BTDC as the optimum injection timing. Coolant temperature was maintained 50ºC during the tests. Results show that increasing engine speed at a constant EGR rate leads to increase in CO and UHC emissions due to the incomplete combustion caused by shorter combustion duration and less homogeneous mixture. Results also show that increasing EGR reduces the amount of oxygen and leads to incomplete combustion and therefore increases CO emission due to lower combustion temperature. HC emission also increases as a result of lower combustion temperatures.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1074835Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1993
 J. W. chung., J. H. kang., N. H. kim., W. kang., B. S. kim, "effects of the fuel injection ratio on the emission and combustion performances of the partially premixed charge compression ignition combustion engine applied with the split injection method,-- International Journal of Automotive Technology, 2008.
 K. Yeom, J. Jang, Ch. Bae, "Homogeneous charge compression ignition of LPG and gasoline using variable valve timing in an engine,-- International Journal of Fuel, 86, 494-503, 2007.
 L. Xingcai, H. Yuchun, Z. Linlin, H. Zhen, "Experimental study on the auto-ignition and combustion characteristics in the homogeneous charge compression ignition (HCCI) combustion operation with ethanol/nheptane blend fuels by port injection,-- Fuel, 85 , 2622-2631, 2006.
 J. A. Gaynor, R. Fleck, R. J. Kee , R. G. Kenny, G. Cathcart, Geoffrey. C., "a study of efficiency and emissions for a 4-stroke SI and a CAI engine with EEGR and light boost,-- International Journal of SAE, 32- 0042, 2006.
 A. C. Alkidas, "Combustion advancements in gasoline engines,-- International Journal of Energy Conversion and Management, 48, 2751- 2761, 2007.
 C. S. Daw, R. M. Wagner , K. D. Edwards, J. B. Green, "Understanding the transition between conventional spark-ignited combustion and HCCI in a gasoline engine,-- Proceedings of the Combustion Institute, 31, 2887-2894, 2007.
 X. L├╝, L. Ji, L. Zu, Y. Hou, C. Huang, Z. Huang, "Experimental study and chemical analysis of n-heptane homogeneous charge compression ignition combustion with port injection of reaction inhibitors,-- International Journal of Combustion and Flame, 149, 261-270, 2007.
 J.J. Hernandez, J. Sanz-Argent, J. Benajes, S. Molina, "selection of a diesel fuel surrogate for the prediction of auto-ignition under HCCI engine conditions,-- International Journal of Fuel,87, 655-665, 2008.
 X. C. Lu┬¿, W. Chen, Z. Huang., "a fundamental study on the control of the HCCI combustion and emissions by fuel design concept combined withcontrollable EGR. Part 2. Effect of operating conditions and EGR on HCCI combustion,-- International Journal of Fuel, 84, 1084-1092, 2005.
 M. Yao ,Z. Chen,Z. Zheng,B. Zhang,Y. Xing., "Study on the controlling strategies of homogeneous charge compression ignition combustion with fuel of dimethyl ether and methanol,-- International Journal of Fuel, 85, 2046-2056, 2006.
 J. Ma, X. L├╝, L. Ji, Z. Huang, "an experimental study of HCCI-DI combustion and emissions in a diesel engine with dual fuel,-- International Journal of Thermal Sciences, 47, 1235-1242, 2008.
 L. Shi, Y. Cui, K. Deng, H. Peng, Y. Chen., " study of low emission homogeneous charge compression ignition (HCCI) engine using combined internal and external exhaust gas recirculation (EGR),-- International Journal of Energy, 31, 2665-2676, 2006.
 A. Dubreuil, F. Foucher, Ch. Mouna─▒┬¿m-Rousselle, G. Dayma ,Ph. Dagaut, "HCCI combustion: Effect of NO in EGR,-- Proceedings of the Combustion Institute, 31, 2879-2886, 2007.
 M. Sjoberg, J. E. Dec, "Comparing late-cycle autoignition stability for single- and two-stage ignition fuels in HCCI engines,-- Proceedings of the Combustion Institute, 31 , 2895-2902, 2007.
 N.K. Miller Jothi, G. Nagarajan, S. Renganarayanan, "LPG fueled diesel engine using diethyl ether with exhaust gas recirculation,-- International Journal of Thermal Sciences, 47, 450-457, 2008.
 D. S. Kim , Ch. S. Lee, " improved emission characteristics of HCCI engine by various premixed fuels and cooled EGR,-- International Journal of Fuel,85, 695-704, 2006.
 X. C. Lu┬¿, W. Chen, Z. Huang, "A fundamental study on the control of the HCCI combustion and emissions by fuel design concept combined with controllable EGR. Part 1. The basic characteristics of HCCI combustion,-- International Journal of Fuel, 84, 1074-1083, 2005.
 J. Chang, Z. Filipi, D. Assanis, T-W Kuo, P. Najt, R. Rask., "Characterizing the thermal sensitivity of a gasoline homogeneous charge compression ignition engine with measurements of instantaneous wall temperature and heat flux,-- International Journal of IMechE, 2005.
 P. Yaping, T. Manzhi, G. Liang, L. Fafa, L. Hua , G. Yingnan, "Study the ethanol SI/HCCI combustion mode Transition by using the fast thermal management system, --Chinese Science Bulletin, vol. 52, no. 19 , 2731-2736, 2007.
 J. Olsson, P. Tunestal, B. Johansson, S. Fiveland, R. Agama, M. Willi , D. Assanis,"Compression Ratio Influence on Maximum Load of a Natural Gas Fueled HCCI Engine,-- SAE, 02P-147, 2002.
 M. Canakci, "An experimental study for the effects of boost pressure on the performance and exhaust emissions of a DI-HCCI gasoline engine,-- International Journal of Fuel, 87, 1503-1514, 2008.
 K. Inagaki, T. Fuyuto, K. Nishikawa, K. Nakakita, I. Sakata, "combustion system with premixture-controlled compression ignition,-- R&D Review of Toyota CRDL Vol.41 No.3, 2006.
 A report to the U.S. Congress, "Homogeneous Charge Compression Ignition (HCCI) Technology --, 2001.
 M. Y. Kim, Ch. S. Lee, "Effect of a narrow fuel spray angle and a dual injection configuration on the improvement of exhaust emissions in a HCCI diesel engine,-- International Journal of Fuel, 2007.
 J.B. Heywood, "Fundamentals of Internal Combustion engine,-- McGraw Hill, New York, 1988, p. 593.
 H. Machrafi, S. Cavadias, J. Amouroux., "a parametric study on the emissions from an HCCI alternative combustion engine resulting from the auto-ignition of primary reference fuels,-- International Journal of Energy, 85, 755-764, 2008.
 H. Machrafi, S. Cavadias, Ph. Guibert,"an experimental and numerical investigation on the influence of external gas recirculation on the HCCI auto-ignition process in an engine: Thermal, diluting, and chemical effects,-- International Journal of Combustion and Flame, 2008.
 R. Chen, N. Milovanovic," A computational study into the effect of exhaust gas recycling on homogeneous charge compression ignition combustion in internal combustion engines fuelled with methane,-- International Journal of Thermal Sciences, 41, 805-813,2002.