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가솔린 및 LPG 연료를 사용하는 직접분사식 불꽃점화엔진에서 배출되는 극미세입자 배출 특성에 관한 연구
이석환(Seokhwan Lee),오승묵(Seungmook Oh),김홍석(Hongseok Kim),조준호(Junho Cho),차경옥(Kyoungok Cha) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
In this study, the numbers, sizes of particles from a single cylinder direct injection spark-ignition (DISI) engine fuelled with gasoline and LPG are examined over a wide range of engine operating conditions. Tests are conducted with various engine loads (2~10bar of IMEP) and fuel injection pressures (60, 90, and 120 bar) at the engine speed of 1,500 rpm. Particles are sampled directly from the exhaust pipe using rotating disk thermodiluter. The size distributions are measured using a scanning mobility particle sizer (SMPS) and the particle number concentrations are measured using a condensation particle counter (CPC). The total particle number concentration for LPG was lower by a factor of 100 compared to the results of gasoline emission due to the good vaporization characteristic of LPG. Test result presents that LPG for direct injection spark ignition engine help the particle emission level to reduce.
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).
직접분사 및 포트분사방식 LPG엔진의 연소 및 배기특성 비교 연구
조준호(Junho Cho),오승묵(Seungmook Oh),이석환(Seokhwan Lee),이수진(Soojin Lee),차경옥(Kyoungok Cha) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
In this study, combustion and emission characteristics were investigated for both direct injection and port fuel injection in an LPG single cylinder spark ignition engine. The engine was operated over three different loads (2, 6, 10 bar of indicated mean effective pressure), fuel injection pressures(60, 90, 120 bar for DI, 7 bar for PFI), and air excess ratio(λ=1) at 2000 rpm. For IMEP DI type were more sensitive to fuel injection timing than PFI and showed higher thermal efficiency than that of PFI type except for 2 bar IMEP. The emission characteristics of DI type were also compared with PFI type. Hydrocarbon emission for DI type was approximately 10% lower than that of PFI type. Nitric oxides emission for both types was increased as the load increases. In addition, carbon monoxide emission for DI type was slightly decreased as the load increases.