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무부하조건의 액상분사 LPG 단기통 SI엔진에서 엔진 회전수 변화가 잔류가스율과 배기가스 변화에 미치는 영향
장진영(Jinyoung Jang),우영민(Youngmin Yoo),염기태(Kitae Yeom),박용국(Youngkug Park),배충식(Changsik Bae),신현동(Hyundong Shin) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_1
Residual gas fraction in engine cylinder affects engine performance, efficiency and emission characteristics. With high residual gas fractions, flame speed and maximum combustion temperature are decreased and these are deeply related with combustion stability especially at idle and NOx emission at relatively high engine load.<br/> In this work, the residual gas traction was calculated by engine simulation code, and which was validated by the experimental data (cylinder pressure and emissions) obtained from liquid injection LPG single cylinder spark ignition engine. A comparison between the results from experiments and computational calculation was made. Residual gas is generated at low engine speed and the larger pressure difference between the intake and exhaust port.