Effect of ethanol fraction on the combustion and emission characteristics of a dimethyl ether-ethanol dual-fuel reactivity controlled compression ignition engine

The purpose of this study was to investigate the effect of the ethanol fraction on the combustion and exhaust emissions characteristics of dimethyl ether (DME)-ethanol dual-fuel reactivity controlled compression ignition (RCCI) engine. In this study, a modified single-cylinder diesel engine was used. The main parameters of this study were the in-cylinder injection timing of DME and the ethanol fraction. The ethanol fraction was found to have a more obvious effect on the indicated mean effective pressure (IMEP) for advanced in-cylinder injection timings than around the top dead center (TDC) conditions. For the same ignition timing, the ethanol fraction had little influence on the IMEP. Increasing the ethanol fraction induced an increase in combustion duration and a decrease in premixed combustion duration (CA10–CA50) around the TDC injection condition. The effect of ethanol on Pmax was insignificant for CA50. The application of the DME-ethanol dual-fuel combustion strategy caused a significant reduction of ISNOx without deterioration of ISsoot. In addition, a high ethanol fraction led to a low ISNOx for the same premixed combustion duration. The ISHC and ISCO emissions increased slightly with increasing ethanol fraction for DME-ethanol dual-fuel combustion. However, the emissions from DME-ethanol combustion were lower than those obtained previously with biodiesel-ethanol and diesel-ethanol dual-fuel combustion.

[1]  Quanchang Zhang,et al.  Experimental investigation of the effects of diesel injection strategy on gasoline/diesel dual-fuel combustion , 2013 .

[2]  S. Turns.  An Introduction to Combustion: Concepts and Applications , 2000 .

[3]  D. Splitter,et al.  Experiments and Modeling of Dual-Fuel HCCI and PCCI Combustion Using In-Cylinder Fuel Blending , 2009 .

[4]  Rolf D. Reitz,et al.  In-Cylinder Fuel Blending of Gasoline/Diesel for Improved Efficiency and Lowest Possible Emissions on a Multi-Cylinder Light-Duty Diesel Engine , 2010 .

[5]  K. Akihama,et al.  Mechanism of the Smokeless Rich Diesel Combustion by Reducing Temperature , 2001 .

[6]  Su Han Park,et al.  Injection strategy for simultaneous reduction of NOx and soot emissions using two-stage injection in DME fueled engine , 2015 .

[7]  M. Han,et al.  Control oriented model of a lean NOx trap for the catalyst regeneration in a 2.2 L direct injection diesel engine , 2015 .

[8]  M. Ishida,et al.  Remarkable improvement of NOx–PM trade-off in a diesel engine by means of bioethanol and EGR , 2010 .

[9]  Su Han Park,et al.  HC and CO emissions reduction by early injection strategy in a bioethanol blended diesel-fueled engine with a narrow angle injection system , 2013 .

[10]  Su Han Park,et al.  Effect of Bioethanol on Combustion and Exhaust Emissions in a Diesel–Bioethanol Dual-Fuel Combustion Engine , 2016 .

[11]  Sunyeong Lee,et al.  On-road chasing and laboratory measurements of exhaust particle emissions of diesel vehicles equipped with aftertreatment technologies (DPF, urea-SCR) , 2015 .

[12]  Jing Li,et al.  Effects of fuel ratio and injection timing on gasoline/biodiesel fueled RCCI engine: A modeling study , 2015 .

[13]  Takeyuki Kamimoto,et al.  High Combustion Temperature for the Reduction of Particulate in Diesel Engines , 1988 .

[14]  Jun Wang,et al.  Visualizations of combustion and emissions characteristics in a light-duty diesel engine with achieved premixed low temperature combustion , 2015 .

[15]  Su Han Park,et al.  Mixing effects of biogas and dimethyl ether (DME) on combustion and emission characteristics of DME fueled high-speed diesel engine , 2014 .

[16]  R. Cracknell,et al.  Understanding the relationship between ignition delay and burn duration in a constant volume vessel at diesel engine conditions , 2015 .

[17]  John E. Dec,et al.  Advanced compression-ignition engines—understanding the in-cylinder processes , 2009 .

[18]  Rolf D. Reitz,et al.  An Experimental Investigation of Fuel Reactivity Controlled PCCI Combustion in a Heavy-Duty Engine , 2010 .

[19]  Javier Monsalve-Serrano,et al.  Effects of direct injection timing and blending ratio on RCCI combustion with different low reactivity fuels , 2015 .

[20]  M. A. Plint,et al.  Engine Testing: Theory and Practice , 1995 .

[21]  Su Han Park,et al.  Bioethanol and gasoline premixing effect on combustion and emission characteristics in biodiesel dual-fuel combustion engine , 2014 .

[22]  Su Han Park,et al.  Effects of Bioethanol-Blended Diesel Fuel on Combustion and Emission Reduction Characteristics in a Direct-Injection Diesel Engine with Exhaust Gas Recirculation (EGR) , 2010 .

[23]  C. Bae,et al.  The potential of di-methyl ether (DME) as an alternative fuel for compression-ignition engines: A review , 2008 .

[24]  Rolf D. Reitz,et al.  Review of high efficiency and clean reactivity controlled compression ignition (RCCI) combustion in internal combustion engines , 2015 .

[26]  N. Iida,et al.  Closed-loop control of HCCI combustion for DME using external EGR and rebreathed EGR to reduce pressure-rise rate with combustion-phasing retard , 2015 .

[27]  John B. Heywood,et al.  Internal combustion engine fundamentals , 1988 .

[28]  Su Han Park,et al.  Applicability of dimethyl ether (DME) in a compression ignition engine as an alternative fuel , 2014 .