Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Effect of Engine Operating Conditions on Combustion and Exhaust Emission Characteristics of a Gasoline Direct Injection(GDI) Engine Fueled with Bio-ethanol

직접분사식 가솔린엔진에서 운전조건에 따른 바이오에탄올의 연소 및 배기배출물 특성

  • Yoon, Seung Hyun (Division of Automotive Engineering, Yeungnam College of Science&Technology) ;
  • Park, Su Han (School of Mechanical Engineering, Chonnam Nat'l Univ.)
  • 윤승현 (영남이공대학교 자동차계열) ;
  • 박수한 (전남대학교 기계공학부)
  • Received : 2015.03.23
  • Accepted : 2015.05.10
  • Published : 2015.07.01
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Abstract

In this study, the combustion and exhaust emission characteristics in a gasoline direct injection engine with variations of the bio-ethanol-gasoline blending ratio and the excess air factor were investigated. To investigate the effects of the excess air factor and the bio-ethanol blends with gasoline, combustion characteristics such as the in-cylinder combustion pressure, rate of heat release (ROHR), and the fuel consumption rate were analyzed. The reduction of exhaust emissions such as carbon monoxide (CO), unburned hydrocarbon (HC), and nitrogen oxides ($NO_x$) were compared with those of gasoline fuel with various excess air factors. The results showed that the peak combustion pressure and ROHR of bio-ethanol blends were slightly higher and were increased as bio-ethanol blending ratio is increased. Brake specific fuel consumption increased for a higher bio-ethanol blending ratio. The exhaust emissions decreased as the bio-ethanol blending ratio increased under all experimental conditions. The exhaust emissions of bio-ethanol fuels were lower than those of gasoline.

본 연구는 직접분사식 가솔린엔진에서 공기 과잉률 및 바이오에탄올-가솔린 혼합연료의 혼합비에 따른 연소특성과 배기배출물 특성을 실험적으로 규명한 것이다. 다양한 공기 과잉률 및 혼합비 조건에서 실험을 수행하였으며, 연소실 압력, 열발생률, 연료소비율 등을 통해 연소특성을 분석하였으며, 배기배출물 특성은 미연탄화수소(HC), 일산화탄소(CO), 질소산화물($NO_x$) 분석을 통해 확인하였다. 혼합연료의 실험결과는 100% 가솔린 및 바이오에탄올 실험결과와 비교하였다. 실험결과 최고연소압력과 열발생률, 제동연료소비율은 혼합비의 증가에 따라 증가하였으며, CO, HC, $NO_x$와 같은 배기배출물은 바이오 에탄올 혼합비율이 증가함에 따라 감소하였다. 혼합연료의 배기배출물 수준은 가솔린 보다 낮게 나타났다.

Keywords

References

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