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DME PCCI 엔진연소에서 운전속도에 따른 분사 파라메터의 선택에 관한 연구
정재훈(Jaehoon Jeong),임옥택(Ocktaeck Lim),표영덕(Youngduck Pyo),이영재(Youngjae Lee) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
The propose of this study is to obtain the influences of pilot injection for various engine speeds on combustion characteristics and emission in a single cylinder DI diesel engine fueled DME. The pilot injection strategies are considered as one of the methodologies to achieve optimum performance and emission reduction. For this investigation, the pilot injection and the main injection timing were varied as a function of engine speeds and their effects on combustion pressure, rate of heat release, pilot and main combustion delay, combustion process and exhaust emissions in terms of NOx, smoke were analyzed. Single cylinder engine was equipped with common rail, injection pressure was 700bar and displacement was 498㏄. The pilot injection with 12.5% of the total injection quantity was tested by varying the timing of both main and pilot injection. The injection strategy is accomplished by varying the dwell time (10℃A, 16℃A and 22℃A) between injections at five main injection timings (-4℃AaTDC, -2℃AaTDC, TDC, 2℃AaTDC and 4℃AaTDC).
직접분사식 압축착화엔진에서 DME-diesel 혼합연료의 연소 및 배기특성에 관한 연구
정재훈(Jaehoon Jeong),임옥택(Ocktaeck Lim),표영덕(Youngduck Pyo),이영재(Youngjae Lee) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
This work experimentally investigates DME-Diesel blended fuel influences combustion characteristics and emissions(NOx, CO, HC, Smoke) in a single-cylinder DI diesel engine. The volume ratios for DME and diesel are 5:95 and 10:90 respectively and the both ratios have been used altogether in blended fuel. DME as an alternative fuel has been actively discussed for clean combustion and low exhaust emission in a compression ignition engine. DME is possible to operate by diesel cycle in a compression ignition engine because high cetane number and low ignition temperature. The low boiling point of DME fuel evaporates quickly when liquid-phase DME spray is injected into the engine cylinder. as a result, it can lead to better mixing with the air in the engine cylinder. For combustion performance of the DME, smokeless combustion can be expected, because of its high oxygen content (around 35% by mass) and the absence of C-C bonds in its molecular structure. On the other hand, DME requires a higher injected mass to obtain the same amount of energy as the diesel fuel, because of its lower density and combustion enthalpy. In this study single cylinder engine was equipped with common rail and injection pressure is 700 bar at 1200 rpm. The amount of injected fuels is adjusted to obtain the fixed IMEP as 5~5.5 bar in order to compare with the fuel conditions. DME is compressed to 15 bar by nitrogen gas thus it can be maintained the liquid phase.
DME/Diesel 듀얼 퓨얼 엔진의 연소 및 배출특성에 관한 연구
임옥택(Ocktaeck Lim),박규열(Kyuyeol Park),표영덕(Youngduck Pyo),이영재(Youngjae Lee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Nowadays we are more concerned about emissions that are harmful in our environment, so at once an increasing of importance to think about clean diesel. One of the alternative technologies covers in this study that is preceded by dual-fuel combustion which is controlling combustion by using two fuels with different auto-ignition values. For dual-fuel combustion, here used two fuels such as DME and diesel. Both of them have different characteristics of evaporation and auto-Ignition. In the current work, we focus on understanding the characteristic of combustion and emissions under single cylinder engine and ignition is done by compression ignition. Pre-mixture is formed by injecting low-pressure DME into an intake manifold and high-pressure fuel (diesel or DME) is injected directly into the cylinder. Both direct diesel injection and port fuel injection reduced the significant amount of Soot, CO and NOx in the homogeneous charge compression ignition engine due to present of oxygen in DME as well having diesel engine like thermal efficiency. In addition, when direct DME injecting in cylinder with port DME injection, there is no changes in emissions and energy consumption rate even causing homogeneous charge compression ignition.