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LPG-DME 혼합연료를 사용하는 연료펌프의 내구성에 관한 연구
최원학(Wonhak Choi),오승묵(Seungmook Oh),이석환(Seokhwan Lee),차경옥(Kyoungok Cha) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently, many researches on alternative fuels were carried out due to increasing needs for lower fuel consumption rate and exhaust emissions. Among these fuels, DME has known as clean energy because of lower NOx compared with gasoline and diesel. However, rubber and plastic are dissolved or swelled easily in DME compared with LPG. Therefore, with seals made from these materials, careful attention is needed when using them with DME. In this study, to find the best seal materials with the tolerance for both LPG and DME, chemical reaction of seal materials was tested through immersion test and tensile test with the LPG-DME blended fuel. Also, chemical analysis was conducted about the residues occurred in immersion test. The results of tensile stress test showed the maximum stress and extensional strain was decreased at 60 to 70%. Through the chemical analysis, it was known that main ingredient of residue was Phthalic acid.
세탄 향상제가 첨가된 LPG 압축착화 엔진에서 EGR 적용에 따른 엔진 성능 및 배출가스 특성에 관한 연구
최원학(Wonhak Choi),이석환(Seokhwan Lee),오승묵(Seungmook Oh),차경옥(Kyoungok Cha) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
In this study, the effect of EGR(exhaust gas recirculation) on the combustion and emissions characteristics has been investigated using a compression ignition (CI) engine operated with LPG(liquefied petroleum gas) and cetane enhancing additive; Di-tertiary-butyl peroxide(DTBP) while fixing the quantity of fuel injection. Increasing the EGR rate leads to deteriorate the IMEP(indicated mean effective pressure) and increase the ignition delay. As a results, use of high EGR rates at constant boost pressure is a way to drastically reduce nitrogen oxides(NOx) but with an moderate increase of indicated specific fuel consumption(ISFC) and other emissions (CO and hydrocarbon).
LPG-DME 혼합연료를 사용하는 전기점화 기관의 연소특성 연구
이석환(Seokhwan Lee),오승묵(Seungmook Oh),최영(Young Choi),강건용(Kernyong Kang),최원학(Wonhak Choi),차경옥(Kyoungok Cha) 한국가스학회 2008 한국가스학회지 Vol.12 No.3
본 연구에서는 DME가 함유된 LPG 연료를 불꽃 점화 기관에서 적용 가능 여부를 실험적으로 살펴보고 있다. LPG와 DME가 함유된 혼합연료로 엔진 구동시 엔진출력, 배출가스 특성, 연소안정성 등의 항목에 대한 실험을 1200~5200 rpm에서 수행하였다. 결과를 살펴보면 20% 내외의 범위에서 DME를 혼합하는 경우 안정된 연소성능을 얻을 수 있었으며 10%까지는 엔진 출력 저하가 거의 없다. 하지만 혼합율이 증가할수록 DME 연료는 LPG보다 에너지 밀도가 낮으므로 출력이 감소하고 제동연료소비율은 증가하는 현상을 보인다. LPG/DME 혼합연료는 향후 DME 시장을 넓혀 나가는 최선의 방법이 될 것이다. In this study, a spark ignition engine operated with the DME blended LPG fuel was investigated experimentally. Performance, emissions characteristics including hydrocarbon, CO, Nox, and combustion stability of an SI engine fuelled with DME blended LPG fuel were examined at 1200~5200 rpm. Results showed that stable engine operation was possible for a wide range of engine loads within 20% mass content of DME fuel. Also, engine output power within 10% mass content of DME fuel was comparable to that of pure LPG fuel operation. However, engine output power was decreased and break specific fuel consumption (BSFC) was severely increased with the amount of blended fuel as the energy content of DME was much lower than that of LPG. DME blended LPG fuel is expected to be potential for enlarging DME market.
LPG-DME 혼합연료를 사용하는 전기점화 기관에서 LPG 성분이 엔진 성능 및 배기특성에 미치는 영향
이석환(Seokhwan Lee),오승묵(Seungmook Oh),최영(Young Choi),강건용(Kernyong Kang),최원학(Wonhak Choi),차경옥(Kyoungok Cha) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this study. a spark ignition engine operated with LPG and DME blended fuel was studied experimentally. The effect of n-butane and propane on performance and emissions of a Sl engine fuelled by LPG/DME blended fuel were examined. Stable engine operation was achieved for a wide range of engine loads with propane containing LPG/DME blended fuel compare to butane containing LPG/DME blended fuel since octane value of propane was much higher than that of butane. Also, engine output power operated with propane containing blended fuel was comparable to pure LPG fuel operation. Engine output power was decreased and break specific fuel consumption (BSFC) was increased with the blended fuel since the energy content of DME was much lower than that of LPG. Considering the results of engine output power, bsfc, and exhaust emissions. the propane containing LPG/DME blended fuel could be used as an alternative fuel for LPG.