000			01874nab a2200205 4500
005			20260520000836.0
008			260224s2009 xxu
245	0	0	_aPerformance and emission characteristics of DME engine with high ratio of EGR
260			_a _b _cnov./dic. 2009
270			_a08/06/2010 ; 08/06/2010
300			_a6 p. ; 5460-5466
520			_aTranscripción del resumen del autor. The combustion of dimethyl ether (DME) fuel, due to its simple chemical structure and high oxygen content, produces less exhaust gaseous products such as HC, CO and NOx. Moreover, soot-free combustion can be observed under all of the operating conditions, which allows a high ratio of exhaust gas recirculation (EGR) for NOx reduction without being restricted by the NOx-soot tradeoff. The effects of a high ratio of exhaust gas recirculation on performance and exhaust emissions from a DME engine were investigated. The results showed that EGR ratio has significant effects on power output and fuel consumption. NOx emission is considerably reduced with the decrease of oxygen concentration, and a higher level of EGR results in a greater reduction in NOx emission. Ultralow NOx emissions have been realized under a high ratio of EGR operations, however, accompanied with the increase of HC and CO emissions. High EGR ratios need to be applied under low loads, but low EGR ratios are sufficient for high loads. Considering all of the operating conditions, optimized EGR ratios were selected, and the tests were conducted under the European Steady-State Test Cycle. As expected, NOx emissions from a DME engine can easily meet the Euro IV limit with optimized EGR ratios.
581			_a6
773	0		_tEnergy & fuels _g23
942			_cARTICULO
100	1		_aSong, Ruizhi _942254
100	1		_aLi, Ke _942255
100	1		_aFeng, Yang _942256
999			_c170777 _d170777