| 제목 |
대형 액상분사식 LPG 엔진의 희박연소특성에 관한 연구 |
| 분야 |
전기동력자동차 |
| 언어 |
Korean |
| 저자 |
오승묵(한국기계연구원), 배충식(한국과학기술원), 김창업(한국기계연구원), 강건용(한국기계연구원), 우영민(한국과학기술원) |
| Key Words |
Liquid phase LPG injection engine(LPG액상분사엔진), Lean burn(희박연소), Fuel stratification(연료성층화), Acetone laser induced fluorescence method(아세톤 레이저유도형광법), single cylinder engine(단기통엔진) |
| 초록 |
Combustion and fuel distribution characteristics of heavy duty engine with the liquid phase LPG injection(LPLI) were studied in a single cylinder engine. Swirl ratio were varied between 1.2, 2.3, and 3.4 following Ricardo swirl number(Rs) definition. Rs=2.3 showed the best results with lower cycle-by-cycle variation and shorter burning duration in the lean region while strong swirl(Rs=3.4) made these worse for combustion enhancement. Excessive swirl resulted in reverse effects due to high heat transfer and initial flame kernel quenching. Fuel injection timings were categorized with open valve injection(OVI) and closed valve injection(CVI). Open valve injection showed shorter combustion duration and extended lean limit. The formation of rich mixture in the spark plug vicinity was achieved by open valve injection. With higher swirl strength(Rs=3.4) and open valve injection, the cloud of fuel followed the flow direction and the radial air/fuel mixing was limited by strong swirl flow. It was expected that axial stratification was maintained with open-valve injection if the radial component of the swirling motion was stronger than the axial components. The axial fuel stratification and concentration were sensitive to fuel injection timing in case of Rs=3.4 while those were relatively independent of the injection timing in case of Rs=2.3. |
| 원문(PDF) |
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