000			01795nab a2200193 4500
005			20260520000838.0
008			260224s2009 xxu
245	0	0	_aMechanism of oxygen concentrations effects on combustion process and emissions of diesel engine
260			_a _b _cnov./dic. 2009
270			_a09/06/2010 ; 09/06/2010
300			_a11 p. ; 5835-5845
520			_aTranscripción del resumen del autor. The mechanism of oxygen concentration effects on the combustion process of diesel combustion and the effects of injection pressure and intake pressure on low-temperature combustion are investigated by CFD simulation. The oxygen concentration is modulated by CO2. The results indicate: with the decrease of oxygen concentration, the peak of the average in-cylinder pressure decreases and the ignition delay becomes long. Decreasing oxygen concentration is the most effective method to control NOx emissions. With the decrease of oxygen concentration, soot emissions increase first and then decrease. It is the essential reason of low soot emissions at low oxygen concentrations that the low in-cylinder combustion temperature leads to the inhibition of soot formation. With the increase of injection pressure, the flow velocity and turbulent kinetic energy in the cylinder increase, which are beneficial to improving the mixing of fuel and air; soot emissions decrease; and NOx emissions increase. The enhancement of intake pressure improves the condition of oxygen lack at lower oxygen concentration. With the increase of intake pressure, ignition delay becomes long. Soot and NOx emissions decrease.
581			_a6
773	0		_tEnergy & fuels _g23
942			_cARTICULO
100	1		_aZheng, Zhaolei _938161
100	1		_aYao, Mingfa _938159
999			_c170826 _d170826