This study describes the effects of palm oil biodiesel (PD) blended with diesel on the combustion performance, emission characteristics and soot morphology in a 4-cylinder CRDI diesel engine. 5 kinds of fuels are used with blending as diesel/biodiesel volume ratio 0%, 10%, 20%, 30%, 100%. The engine is operated under idle speed, 750rpm and load conditions of the engine are 0 Nm and 40Nm. The Coefficient of Variation(COV) of Indicated Mean Effective Pressure(IMEP) shows that the engine operates very steadily in the idle state. But fuel consumption is increased. And Emission results show that the oxygen in biodiesel has a great influence on the production of exhaust emissions. The nitrogen oxides(NOx) is decreased because of high viscosity and low heating values of biodiesel at low blend ratio. But NOx and Carbon monoxide(CO) are increased above a certain blend ratio. Particulate matter(PM) and Hydrocarbons(HC) is decreased according to increase of blend ratio. The size of soot is decreased and the morphology of soot is developed to cluster with increasing blend ratio.

ABSTRACT
 1. 서론
 2. 실험장치 및 실험방법
  2.1 실험 기관 및 사용 연료
  2.2 실험방법
 3. 실험결과 및 분석
  3.1 연소 특성
  3.2 연료소비율
  3.3 배기 특성
  3.4 매연 입자 크기와 형태
 4. 결론
 References

• 김호영(Mechanical Design Engineering, Chonbuk National University) | Ho-Young Kim
• 갈준총(Mechanical Design Engineering, Chonbuk National University) | Jun-Cong Ge
• 최낙정(Mechanical Design Engineering, Chonbuk National University) | Nag-Jung Choi Corresponding Author