TY - GEN
T1 - Experimental study of methane fuel oxycombustion in an SI engine
AU - Van Blarigan, Andrew
AU - Kozarac, Darko
AU - Seiser, Reinhard
AU - Cattolica, Robert
AU - Chen, Jyh Yuan
AU - Dibble, Robert
PY - 2012
Y1 - 2012
N2 - An experimental investigation of the thermal efficiency, combustion efficiency, and CoV IMEP, of methane fuel oxycom-bustion in an SI engine has been carried out. Compression ratio, spark-timing, and oxygen concentration were all varied. A variable compression ratio SI engine was operated on both wet and dry EGR working fluids, with results illustrating that the efficiency of the engine operating with a large amount of EGR was significantly reduced relative to methane-in-air operation over all oxygen concentrations and compression ratios. The maximum thermal efficiency of wet EGR, dry EGR, and air was found to be 23.6%, 24.2%, and 31.4%, respectively, corresponding to oxygen volume fractions of 29.3%, 32.7% and 21%. Combustion efficiency was above 98% for wet EGR and approximately 96% for dry EGR. CoV IMEP was low for both cases. The much lower efficiency of both EGR cases relative to air is primarily a result of the reduced specific-heat ratio of the EGR working fluids relative to air working fluid.
AB - An experimental investigation of the thermal efficiency, combustion efficiency, and CoV IMEP, of methane fuel oxycom-bustion in an SI engine has been carried out. Compression ratio, spark-timing, and oxygen concentration were all varied. A variable compression ratio SI engine was operated on both wet and dry EGR working fluids, with results illustrating that the efficiency of the engine operating with a large amount of EGR was significantly reduced relative to methane-in-air operation over all oxygen concentrations and compression ratios. The maximum thermal efficiency of wet EGR, dry EGR, and air was found to be 23.6%, 24.2%, and 31.4%, respectively, corresponding to oxygen volume fractions of 29.3%, 32.7% and 21%. Combustion efficiency was above 98% for wet EGR and approximately 96% for dry EGR. CoV IMEP was low for both cases. The much lower efficiency of both EGR cases relative to air is primarily a result of the reduced specific-heat ratio of the EGR working fluids relative to air working fluid.
UR - http://www.scopus.com/inward/record.url?scp=84892637197&partnerID=8YFLogxK
U2 - 10.1115/ICEF2012-92109
DO - 10.1115/ICEF2012-92109
M3 - Conference contribution
AN - SCOPUS:84892637197
SN - 9780791855096
T3 - ASME 2012 Internal Combustion Engine Division Fall Technical Conference, ICEF 2012
SP - 339
EP - 348
BT - ASME 2012 Internal Combustion Engine Division Fall Technical Conference, ICEF 2012
T2 - ASME 2012 Internal Combustion Engine Division Fall Technical Conference, ICEF 2012
Y2 - 23 September 2012 through 26 September 2012
ER -