|Title||정진영, 주용준, 배충식, "분무유도식 직접분사 전기점화엔진에서 n-butane의 분무 및 연소 특성", 2014 한국자동차공학회 부문종합 추계학술대회, 2014. 11|
In this study, spray visualization in a constant volume chamber and single cylinder metal as well as optical engine tests were carried out in order to investigate spray and combustion characteristics of n-butane and gasoline. From spray visualization results, recirculation zone of n-butane spray was largely formed while spray penetration of n-butane was shorter compared to those of gasoline. In the single cylinder engine test, n-butane showed slower combustion speed and lower peak heat release rate leading to lower indicated mean effective pressure (IMEP) but better combustion stability with injection pressure of 10 MPa. In addition, nitrogen oxides (NOx) and smoke emissions in case of n-butane were much lower than those of gasoline due to slower combustion and better vaporization characteristic, respectively. From results of optical engine test, non-luminous blue flame was diminished while luminous yellowish flame, which is diffusion controlled flame leading to high smoke emission became dominant as injection timing was retarded because of longer required mixing time. N-butane showed lower portion of luminous yellowish flame portion than that of gasoline. This is due to that required mixing time of n-butane was shorter than that of gasoline, which led to lower smoke emissions of n-butane.