Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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Performance and Emission Characteristics of Dual-fuel(Diesel-CNG) Combustion in a Diesel Engine

디젤엔진에서 경유-CNG 혼합 연소의 성능 및 배기 특성

  • Ryu, Kyung-Hyun (School of Mechanical & Automotive Engineering, Kunsan National University) ;
  • Park, Jin-Chul (Department of Mechanical Engineering, Graduate School, Kunsan National University) ;
  • Choi, Kyu-Ho (Department of Mechanical Engineering, Graduate School, Kunsan National University)
  • 유경현 (군산대학교 기계자동차공학부) ;
  • 박진철 (군산대학교 일반대학원 기계공학과) ;
  • 최규호 (군산대학교 일반대학원 기계공학과)
  • Received : 2009.11.06
  • Accepted : 2010.01.14
  • Published : 2010.07.01
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Abstract

This paper describes an investigation of the performance and emission characteristics of a commercial cylinder direct injection diesel engine operating on natural gas with pilot diesel ignition. Engine tests for variations in the pilot injection timing were performed at an engine speed of 1500 rpm. This study showed that the performance of the dual-fuel diesel engine increased as the engine load increased and as the pilot diesel injection timing angle advanced. The peaks of cylinder pressure, pressure rise rate, and heat release rate all increased while the fuel ignition timing advanced with the pilot injection timing. The engine operation was stable, and the least smoke was produced at a pilot injection timing of $12^{\circ}$ before top dead center. NOx emissions were only exhausted under high-load conditions, and they increased as the pilot injection timing angle advanced.

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