An Analysis on the Effects of EGR to Extend Operation Region for a HCCI Hydrogen Engine
HCCI 수소기관에서 운전영역확장을 위한 EGR 효과 분석

2015 Transactions of the Korean hydrogen and new energy society  
>> HCCI (Homogeneous Charge Compression Ignition) hydrogen engine has relatively narrower operation range caused by knock occurrence due to the rapid pressure rising by using higher compression ratio. In this study, EGR as one of the countermeasure methods is considered to extend operation range of HCCI hydrogen engine. Also, the effects of hydrogen EGR are compared with the effects of EGR using hydrocarbon fuel. Hydrocarbon EGR is carried out by adding carbon dioxide to exhaust gas of HCCI
more » ... ogen engine. As the results, EGR has positive effects on a HCCI hydrogen engine in reducing rate of pressure rise as same as the other engines used hydrocarbon fuels. However, the effects of hydrogen EGR are better than those of hydrocarbon EGR in decreasing minimum compression ratio and rate of pressure rise. When applying EGR to HCCI hydrogen engine by 20% rate, the rate of pressure rise decreases by 58% and it results in about 48% increase of the operation range in terms of supply energy.
doi:10.7316/khnes.2015.26.6.560 fatcat:ytlng2pmbfeojm4hnkwdrvs43a