Journal of the Korean Institute of Gas (한국가스학회지)

The Korean Institute of GAS (한국가스학회)
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A Study on the Full Load Performance and Emission Characteristics with Turbo-charger Change in a HCNG Engine

HCNG 엔진의 터보차저 변경에 따른 전부하 출력 및 배출가스 특성 연구

  • Park, Cheolwoong (Korea Institute of Machinery and Materials) ;
  • Kim, Changgi (Korea Institute of Machinery and Materials) ;
  • Lim, Gihun (Dept. of Environment & Energy Mechanical Engineering, University of Science and Technology) ;
  • Lee, Sungwon (Korea Institute of Machinery and Materials) ;
  • Choi, Young (Korea Institute of Machinery and Materials) ;
  • Lee, Sunyoup (Korea Institute of Machinery and Materials)
  • Received : 2013.08.02
  • Accepted : 2013.09.27
  • Published : 2013.10.31
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Abstract

Hydrogen-natural gas blends(HCNG) engine is optimizing technology of performance and emission characteristics with use of hydrogen's fast flame speed and wide flammability limit. As lean-burn limit is extended, the improvement in thermal efficiency and harmful emissions can be achieved. However, the extension of lean-burn limit under a wide open throttle operation point could be realized with the increase in boosting capacity in a lean-burn engine with turbo-charging system. In the present study, the power output characteristics of HCNG engine with turbo-charger change is assessed and feasibility of the increase in boosting capacity is evaluated. The turbo-charger design with high efficiency at higher flow rate rather than higher boosting pressure makes efficient operation possible at relatively rich mixture condition.

천연가스에 수소를 첨가하는 수소-천연가스 혼합연료 (HCNG) 엔진 기술은 수소의 빠른 화염속도와 넓은 가연범위를 이용하여 출력 및 배기성능을 최적화하는 기술로서 희박연소 한계를 증가시킴으로써 열효율의 개선은 물론 유해배출물의 저감을 얻을 수 있다. 그러나 과급장치를 사용하는 희박연소 엔진의 경우 전부하 운전조건에서 희박연소 한계의 증가는 충분한 공기량을 공급할 수 있도록 과급용량의 증가가 선결되어야 구현될 수 있다. 본 연구에서는 HCNG 엔진 개발의 일환으로 과급시스템의 변경에 의한 엔진의 출력특성을 파악하고, 과급용량 증대의 적용가능성을 검토하고자 하였다. 터보차저가 과급압력의 증대 보다는 유량이 증가된 영역에서 효율이 높게 설계된 경우 농후한 혼합기 조건에서는 과급압력이 감소되더라도 제원상의 출력을 만족하며 효율적인 운전이 가능하였다.

Keywords

References

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