International Conference


TitleChoongsik Bae, Seik Park, and Sanghoon Kook, "The Influence of Intake Air Boosting and EGR on Diesel-Fueled HCCI Combustion in a DI-Diesel Engine," THIESEL2006 conference (Thermo-and fluid dynamic Processes in Diesel Engines), Valencia, Sep. 2006.

Choongsik Bae, Seik Park, and Sanghoon Kook, “The Influence of Intake Air Boosting and EGR on Diesel-Fueled HCCI Combustion in a DI-Diesel Engine,” THIESEL2006 conference (Thermo-and fluid dynamic Processes in Diesel Engines), Valencia, Sep. 2006.

Abstract

Direct-injection diesel engines have expanded its market owing to the benefit of fuel economy. The development of high pressure injection equipment such as common-rail system enables reduction of emissions and improvement of fuel consumption. The operational excellence of diesel combustion could be potentially extended to achieve better performance through homogeneous charge compression ignition (HCCI) combustion. It has the advantages of reduced NOx emission resulting from the low combustion temperature under homogeneous charge lean burn conditions, and reduced PM by the premixed combustion.

The application of early diesel injection for near-homogeneously premixed charge was tested in the single-cylinder engine. HCCI combustion has been investigated with the variety of fuel injection parameters e.g. injection timing, number of injections. In an attempt to extend the upper load limit for HCCI operation at the fixed engine speed 1200 rpm, intake air boosting in combination with Exhaust Gas Recirculation (EGR) has been applied: boosting up to 1.2 bar to increase the power density and EGR up to 45% to control the combustion phase. Results showed the early-injection of 60~70°CA BTDC achieved negligible amount of PM and NOx emissions. The two-stage injection injecting most of the fuel at early timing followed by small amount of near TDC injection provided guidance to increase the power-output. Increasing boost pressure resulted in much higher power-output. Optimal EGR rate in high power-output was observed at around 30% due to the trade-off characteristics between combustion efficiency and work conversion efficiency.

PreviousS. Moon, E.F. Abo-Serie, H.D. Shin and C. Bae, “Static Pressure Distribution inside the Swirl Spray,” presented at ICLASS 2006, Kyoto, Aug. 2006.
NextKitae Yeom and Choongsik Bae, “The Combustion of Liquefied Petroleum Gas in Stratified and Homogeneous Charge Compression Ignition Engine”, Proc. 6th international colloquium Fuels, pp201-208, January 10-11, Stuttgart, Germany, 2007.

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