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Energies 2013, 6(10), 5157-5167; doi:10.3390/en6105157

Effects of High EGR Rate on Dimethyl Ether (DME) Combustion and Pollutant Emission Characteristics in a Direct Injection Diesel Engine

1
Division of Automotive Engineering, Yeungnam College of Science & Technology, 170 Hyeonchung-ro, Nam-gu, Daegu 705-703, Korea
2
School of Mechanical Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791, Korea
*
Author to whom correspondence should be addressed.
Received: 13 August 2013 / Revised: 14 September 2013 / Accepted: 30 September 2013 / Published: 14 October 2013
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Abstract

This study investigated the effects of high exhaust gas recirculation (EGR) rates on dimethyl ether (DME) fuel combustion performance, exhaust emissions and particle emission characteristics in a small direct injection diesel engine under various injection timings. To examine the effect of EGR and injection timings, the experiment was performed under high EGR rates (0%, 30%, 50%) and injection timings were varied from 40° before top dead center (BTDC) to top dead center (TDC) of the crank angle to examine the effects of early injection of DME fuel. The combustion pressures and heat release rates for different EGR rates followed similar trends. As the injection timing was advanced, the indicated mean effective pressure (IMEP) differed little in response to EGR rate in the range from TDC to 25° BTDC, and more for crank angles beyond 25° BTDC. DME combustion exhibited very little soot emission, but soot emission increased slightly with EGR rate. The use of high EGR during combustion produced very low NOx concentrations but increased HC and CO emissions for advanced injection timings from 25° BTDC to 40° BTDC. The use of EGR increased both the emissions of total particle number and particle volume over the whole range of the injection timings; for all cases, total particle volume decreased as injection timing was advanced. View Full-Text
Keywords: dimethyl ether; alternative fuel; combustion characteristics; exhaust gas recirculation; particle emission dimethyl ether; alternative fuel; combustion characteristics; exhaust gas recirculation; particle emission
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Yoon, S.H.; Han, S.C.; Lee, C.S. Effects of High EGR Rate on Dimethyl Ether (DME) Combustion and Pollutant Emission Characteristics in a Direct Injection Diesel Engine. Energies 2013, 6, 5157-5167.

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