Experimental evaluation of combustion phenomena in and nanoparticle emissions from a side-mounted direct-injection engine with gasoline and liquid-phase liquefied petroleum gas fuel

This study focuses on the experimental comparison of combustion phenomena and nanoparticle emission characteristics from a wall-guided direct-injection (DI) spark ignition engine for gasoline and liquefied petroleum gas (LPG). A returnless gasoline direct-injection (GDI) fuel supply system was reworked for the return-type liquid-phase LPG injection fuel supply system that was composed of an LPG tank with a brushless d.c. pump and a low-pressure regulator to supply the stable liquid-phase LPG for the DI engine. To verify the clean combustion characteristics of the LPG DI engine, nanoparticle concentrations obtained with a differential mobility spectrometer and the total hydrocarbon and nitrogen oxide emission levels were compared with those of a gasoline-fuelled engine. The maximum performance and the part-load combustion phenomena of the two fuels were evaluated. In conclusion, the nanoparticle and exhaust emissions of the LPG DI engine were much lower than those of the GDI engine. Furthermore, the combustion performance of LPG in the full-load condition was comparable with that of the gasoline fuel, and the combustion stability in a part-load condition of LPG was better than that of gasoline because it evaporated very rapidly and mixed well with the air. As a result, a substantial reduction in the fuel wetting in the combustion chamber was achieved.

[1]  Simsoo Park,et al.  Time-resolved particle emission and size distribution characteristics during dynamic engine operation conditions with ethanol-blended fuels , 2009 .

[2]  Simsoo Park,et al.  Experimental investigation of nanoparticle formation characteristics from advanced gasoline and diesel fueled light duty vehicles under different certification driving modes , 2009 .

[3]  G. B. Parvate-Patil,et al.  An Assessment of Intake and Exhaust Philosophies for Variable Valve Timing , 2003 .

[4]  Giechaskiel Barouch,et al.  Particle Measurement Programme (PMP) Light-duty Inter-laboratory Correlation Exercise (ILCE_LD) Final Report , 2007 .

[5]  Simsoo Park,et al.  Experimental investigation on the time resolved THC emission characteristics of liquid phase LPG injection (LPLi) engine during cold start , 2007 .

[6]  Y. I. Jeong,et al.  Experimental investigation and comparison of nanoparticle emission characteristics in light-duty vehicles for two different fuels , 2008 .

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

[8]  Richard Stone,et al.  Analysis of the particulate emissions and combustion performance of a direct injection spark ignition engine using hydrogen and gasoline mixtures , 2010 .

[9]  Junho Cho,et al.  Combustion and Emission Characteristics in a Direct Injection LPG/Gasoline Spark Ignition Engine , 2010 .

[10]  S. Samuel,et al.  Experimental investigation into particulate size and number distribution from a spark ignition engine: In-cylinder combustion and transient events , 2008 .

[11]  D. Kittelson.  Engines and nanoparticles: a review , 1998 .

[12]  Simone Hochgreb,et al.  MECHANISMS OF PARTICULATE MATTER FORMATION IN SPARK-IGNITION ENGINES. 1: EFFECT OF ENGINE OPERATING CONDITIONS , 1999 .

[13]  C. Myung,et al.  Effects of gasoline, diesel, LPG, and low-carbon fuels and various certification modes on nanoparticle emission characteristics in light-duty vehicles , 2009 .

[14]  H. L. Walmsley,et al.  Particulate and Hydrocarbon Emissions from a Spray Guided Direct Injection Spark Ignition Engine with Oxygenate Fuel Blends , 2007 .

[15]  C. Myung,et al.  Experimental Investigation on Flow Rate Performance and LPLi Engine Application of Turbine Pump with Various Composition Ratio of LPG Fuel , 2007 .