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Combustion and emission characteristics of a gasoline–dimethyl ether dual-fuel engine
Cha, Junepyo,Kwon, Sangil,Kwon, Seokjoo,Park, Sungwook SAGE Publications 2012 Proceedings of the Institution of Mechanical Engin Vol.226 No.12
<P>An experimental investigation was performed to investigate the effect of a split-injection strategy on the combustion and exhaust emission characteristics as well as on the particle number distribution for a single-cylinder compression ignition engine with gasoline-dimethyl ether dual fuelling. The gasoline-dimethyl ether dual-fuel injection system utilized port injection for gasoline and direct injection for dimethyl ether. In the present system, premixed fuel (i.e. gasoline) was injected into the premixing chamber at an injection pressure of 3 MPa using gasoline direct injection to mix the air-gasoline mixture sufficiently. However, dimethyl ether fuel was injected at an injection pressure of 50 MPa directly into a combustion chamber in order to control the combustion phase, resulting in a change in the direct-injection timing from -20 to +2 degrees crank angle. The experimental results show that the gasoline-dimethyl ether dual-fuel engine exhibited benefits in the indicated mean effective pressure for early-injection cases (i.e. near -10 degrees crank angle after top dead centre). However, the indicated mean effective pressure of the gasoline-dimethyl ether dual-fuel engine deteriorated for delayed-injection cases owing to incomplete combustion. In addition, a significant reduction in the nitrogen oxide emissions was observed using gasoline-dimethyl ether dual fuel compared with those obtained using conventional dimethyl ether combustion. In particular, soot emissions are almost at zero level for all the cases. On the other hand, hydrocarbon and carbon dioxide emissions increase with an increasing portion of premixed injection fuel (i.e. gasoline) in conventional injection timing, which is near top dead centre.</P>
디젤엔진에서 가솔린 예혼합이 연소 및 배기 특성에 미치는 영향
차준표(Junepyo Cha),권석주(Seokjoo Kwon),허정윤(Jeong Yun Heo),이창식(Chang Sik Lee),박성욱(Sung Wook Park) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.40
The purpose of the present work is to investigate the effect of gasoline-premixing on a combustion and emissions characteristics in a compression ignition engine. For studying combustion characteristics, a combustion pressure and rate of heat release (ROHR) were measured using a single-cylinder DI compression ignition engine with a common-rail injection system and premixed fuel injection system. In addition, exhaust emissions characteristics were studied using emission analyzers and smoke meter. The experimental results showed that the case of gasoline-premixing had longer ignition delay and lower combustion pressure compared to the cases of diesel direct injection. Furthermore, premixed gasoline-air mixture reduced NOx emissions due to low peak of ROHR.
압축착화기관에서 DME-바이오디젤 혼합연료의 분무 및 배기 특성에 관한 연구
차준표(Junepyo Cha),박수한(Su Han Park),이창식(Chang Sik Lee),박성욱(Sung Wook Park) 대한기계학회 2011 大韓機械學會論文集B Vol.35 No.1
본 연구는 DME-바이오디젤 혼합연료의 분무 및 연소, 배기 특성을 바이오디젤과 비교한 실험적 연구이며 실험연료는 바이오디젤 (BD100)과 중량 기준으로 DME를 20% 혼합한 DME-바이오디젤 혼합연료 (B-DME20)이다. 거시적 분무 특성을 연구하기 위하여 분무 이미지로부터 분무도달거리, 분무각을 측정하였으며, 연소 및 배기 특성은 단기통 직접 분사식 압축착화 기관을 이용하여 분석하였다. 실험결과 바이오디젤과 DME-바이오디젤 혼합연료는 분사율에서는 큰 차이가 없었지만 혼합연료의 경우에 착화지연기간이 짧고 연소압력이 높았으며soot 배출물이 현저하게 줄어들었다. The purpose of this study is to investigate experimentally the spray-atomization and combustion-emission characteristics of biodiesel-DME blended fuel. In this study, two types of test fuels pure biodiesel (BD100) and blended fuel (B-DME20) were used, and the spray and combustion characteristics of different fuel compositions were analyzed. DME constitutes 20% and biodiesel constitutes 80% (by mass fraction) of the blended fuel. The overall spray characteristics, spray tip penetration, and cone angle were evaluated using frozen spray images. In addition, the combustion and emission characteristics were analyzed on the basis of the evaluated data for a single-cylinder CI engine with common-rail injection system. It was revealed that the injection profiles of both the test fuels for a given injection pressure showed similar trends. However, the injection profiles of the blended fuel (B-DME20) indicated shorter ignition delay than those of biodiesel.
차준표(Junepyo Cha),권석주(Seokjoo Kwon),강민구(Mingu Kang),이창식(Chang Sik Lee),박성욱(Sungwook Park) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
An experimental investigation was conducted to analyze the effects of stoichiometric combustion on the combustion and exhaust emissions characteristics in a single cylinder compression ignition (CI) diesel engine with common-rail injection system. In order to achieve the stoichiometric combustion, then it was carried out under various equivalence ratio which was varied from 0.63 to 1.0, which was controlled to intake air system and exhaust gas recirculation (EGR). The exhaust emissions, such as NOx and soot, were measured from emission gas analyzer at tail-pipe. The experimental results show that the trends of normalized indicated mean effective pressure (IMEP) slightly decreased according to increasing of equivalence ratio. In addition, ISNOx was dramatically reduced but ISsoot was relatively increased under increasing of equivalence ratio.
바이오디젤을 적용한 압축착화 엔진에서 EGR율에 따른 연소 및 미세입자 배출물 특성
차준표(Junepyo Cha),윤승현(Seung Hyun Yoon),박성욱(Sung Wook Park),이창식(Chang Sik Lee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
An experimental investigation was conducted to analyze the effects of EGR ratio on the combustion, exhaust emissions characteristics and size distributions of particulate matter in a single cylinder diesel engine with common-rail injection system. In order to analyze the combustion, exhaust emissions and measurement of size distributions of particulate matter were carried out under various EGR ratio which was varied from 20~60% and the results were compared to those of results without EGR. The experimental results show that ignition delay was extended and maximum value of ROHR was decreased according to increasing of EGR ratio. In addition, increasing of EGR ratio reduced oxidies of nitrogen (NOx) but soot emissions increased. However, under high EGR ratio region, particulate matter was slightly decreased.
압축착화 엔진에서 가솔린 예혼합이 연소 및 배기 특성에 미치는 영향
차준표(Junepyo Cha),권석주(Seokjoo Kwon),허정윤(Jeong Yun Heo),이창식(Chang Sik Lee),박성욱(Sung Wook Park) 한국연소학회 2010 한국연소학회지 Vol.15 No.4
The purpose of the present work is to investigate the effect of gasoline-premixing on a combustion and emissions characteristics in a compression ignition engine. For studying combustion characteristics, a combustion pressure and rate of heat release (ROHR) were measured using a single-cylinder DI compression ignition engine with a common-rail injection system and premixed fuel injection system. In addition, exhaust emissions characteristics were studied using emission analyzers and smoke meter. The experimental results showed that the case of gasoline-premixing had longer ignition delay and lower combustion pressure compared to the cases of diesel direct injection. Furthermore, premixed gasoline-air mixture reduced NOx emissions due to low peak of ROHR.
디젤엔진에서 DME-바이오디젤 혼합연료의 분무 및 배기 특성에 관한 연구
차준표(Junepyo Cha),박수한(Su Han Park),이창식(Chang Sik Lee),박성욱(Sung Wook Park) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
본 연구는 DME-바이오디젤 혼합연료의 분무 및 연소, 배기 특성을 바이오디젤과 비교한 실험적 연구이며 실험연료는 바이오디젤 (BD100)과 중량 기준으로 DME를 20% 혼합한 DME-바이오디젤 혼합연료 (B-DME20)이다. 거시적 분무 특성을 연구하기 위하여 분무 이미지로부터 분무도달거리, 분무각을 측정하였으며, 연소 및 배기 특성은 단기통 직접 분사식 압축착화 기관을 이용하여 분석하였다. 실험결과 바이오디젤과 DME-바이오디젤 혼합연료는 분사율에서는 큰 차이가 없었지만 혼합연료의 경우에 착화지연기간이 짧고 연소압력이 높았으며 soot 배출물이 현저하게 줄어들었다. The purpose of the present work is to investigate the spray atomization, combustion and emissions characteristics of biodiesel-DME blended fuels compared to a pure biodiesel fuel derived from soybean. The test fuel was a pure biodiesel (BD100) and a blended fuel (B-DME20) which was added DME by 20 % mass based fraction into biodiesel. For studying the overall spray characteristics, the spray tip penetration, spray cone angle were analyzed from the spray images. In addition, combustion and exhaust emissions characteristics were studied using a single-cylinder DI compression ignition engine with a common-rail injection system. The experimental results showed that blended fuel had shorter ignition delay and higher combustion pressure compared to those of biodiesel although both fuels indicated similar trends in injection rate for the same injection pressures. Furthermore, the blended fuel significantly reduced soot emissions.