| 제목 |
2단분사법에 따른 예혼합압축착화엔진의 연소 및 배기특성 |
| 분야 |
엔진 및 연소 |
| 언어 |
Korean |
| 저자 |
국상훈(한국과학기술원), 배충식(한국과학기술원), 박철웅(한국과학기술원), 최욱(한국과학기술원) |
| Key Words |
HCCI(Homogeneous Charge Compression Ignition, 예혼합압축착화), Two-stage injection(2단분사), Cool flame(냉염), Compression ratio(압축비), A/F(Air Fuel Ratio, 공연비) |
| 초록 |
HCCI (Homogeneous Charge Compression Ignition) combustion has a great advantage in reducing NOx (Nitrogen Oxides) and PM (Particulate Matter) by lowering the combustion temperature due to spontaneous ignitions at multiple sites in a very lean combustible mixture. However, it is difficult to make a diesel-fuelled HCCI possible because of a poor vaporability of the fuel. To resolve this problem, the two-stage injection strategy was introduced to promote the ignition of the extremely early injected fuel. The compression ratio and air-fuel ratio were found to affect not only the ignition, but also control the combustion phase without a need for the intake-heating or EGR (Exhaust Gas Recirculation). The ignition timing could be controlled even at a higher compression ratio with increased IMEP (Indicated Mean Effective Pressure). The NOx (Nitrogen Oxides) emission level could be reduced by more than 90 % compared with that in a conventional DI (Direct Injection) diesel combustion mode, but the increase of PM and HC (Hydrocarbon) emissions due to over-penetration of spray still needs to be resolved. |
| 원문(PDF) |
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