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DME 분사 시기 조절을 통한 수소-DME 부분 예혼합 압축착화 연소 제어
전지연(Jeeyeon Jeon),배충식(Choongsik Bae) 한국연소학회 2013 한국연소학회지 Vol.18 No.1
Hydrogen-dimethy ether(DME) partially premixed compression ignition(PCCI) engine combustion was investigated in a single cylinder compression ignition engine. Hydrogen and DME were used as low carbon alternative fuels to reduce green house gases and pollutant. Hydrogen was injected at the intake manifold with an injection pressure of 0.5 ㎫ at fixed injection timing, -210 ℃A aTDC. DME was injected directly into the cylinder through the common-rail injection system at injection pressure of 30 ㎫. DME inejction timing was varied to find the optimum PCCI combustion to reduce CO, HC and NOx emissions. When DME was injected early, CO and HC emissions were high while NOx emission was low. As the DME injection was retarded, the CO and HC emissions were decreased due to high combustion efficiency. NOx emissions were increased due to the high in-cylinder temperature. When DME were injected at -30 ℃A aTDC, reduction of HC, CO and NOx emissions was possible with high value of IMEP.
수소-DME 압축착화엔진에서의 DME 분사 시기에 따른 영향
전지연(Jeeyeon Jeon),배충식(Choongsik Bae) 한국연소학회 2009 KOSCOSYMPOSIUM논문집 Vol.- No.38
The hydrogen combustion with dimethyl-ether(DME) as an ignition promoter was investigated in a single cylinder engine using compression ignition engine. The hydrogen was injected at intake manifold to make homogeneous charge, and the DME was injected directly into the cylinder with common-rail system as an igniter. The hydrogen and DME injection quantity and DME injection timing were varied corresponding to the fixed total lower heating value. The injection timing of DME was varied from 35 crank angle degrees before the top dead center to the top dead center. indicated mean effective pressure, ignition delay, and emissions were tested under the same load condition. As DME injection timing was advanced, combustion temperature was lowered, and the emissions of carbon monoxide and hydrocarbon were increased by formation of lean premixed charge. When DME was injected near 10 crank angle degrees before top dead center, carbon monoxide and hydrocarbon emissions were minimum and the nitric oxides emission was maximum due to high pressure and heat release rate. If the injection timing of DME was retarded near to the top dead center, indicated mean effective pressure was increased due to partially rich region. DME early injection before the 40 crank angle degrees before the top dead center made unstable combustion due to excessive lean DME mixture. Misfire was occurred when DME was injected after the top dead center.
DME를 착화 보조제로 사용한 수소 예혼합압축착화 엔진에서 배기가스 재순환의 영향
전지연(Jeeyeon Jeon),배충식(Choongsik Bae) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
Hydrogen and DME(dimethyl-ether) were used as low carbon alternative fuels to reduce green house gases and pollutant. Also, Hydrogen fueled HCCI combustion control technology was investigated to maintain high thermal efficiency which is advantage of conventional CI(Compression ignition) engine, while reducing noise and bad NOx emission characteristics, disadvantages of conventional CI engine. DME was used as an ignition promoter because DME is easy to gasify and mix and has better compression ignition characteristics compared with conventional diesel fuel.DME injection strategy could act as an ignition promoter of hydrogen HCCI engine combustion. Advanced injection timing of DME showed premixed combustion characteristics of high octane numbered fuel. The indicated mean effective pressure(IMEP), pressure rise, and heat release rate, caused by retarded injection timing, were attributable to partially rich region that helped DME and hydrogen combustion. When the EGR was used, the in-cylinder pressure and heat release rate was smoothened, but the combustion phase was retarded which made better IMEP. The CO and HC emissions were worse than without EGR condition, however, NOx emission was improved.