| 제목 |
스파크 점화 기관에서 밸브오버랩이 잔류가스율 변화에 미치는 영향 |
| 분야 |
엔진 및 연소 |
| 언어 |
Korean |
| 저자 |
장진영(한국과학기술원), 배충식(한국과학기술원), 박용국(한국과학기술원), 김우태(현대자동차) |
| Key Words |
Residual gas fraction(잔류가스율), Valve oiverlap duration(밸브 오버랩 기간), Valve overlap center(밸브 오버랩 센터) |
| 초록 |
Residual gas fraction in an engine cylinder affects engine perfornance, efficiency and emission characteristics. With high residual gas fractions, a flame speed and maximum combustion temperature arc decreased and these are deeply related with combustion stability especially at idle and NOx emission at relatively high engine load. In this work, the residual gas fraction was calculated by an engine simulation code, which was validated by the experimental data (cylinder pressure and emissions) obtained from 4-eyliner spark ignition engine. A comparison between experimental and computational calculation results was made. The residual gas is generated mostly at low engine speed by the larger pressure difference between the intake and exhaust port. As the valve overlap duration was increased, the amount of residual gas in the cylinder, the amount of HC emission in the exhaust gas and the variation of power output increased. |
| 원문(PDF) |
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