|Title||김재헌, 박현욱, 배충식, “ECN 연구용 고온 고압 정적 연소실에서의 n-dodecane 분무 및 연소 특성”, 2014 한국액체미립화학회 학술 강연대회, 2014. 9.|
The spray and combustion characteristics of n-dodecane fuel were investigated in a CVCC (constant volume combustion chamber). The selection of ambient conditions for the spray followed ECN (engine combustion network) guidelines, which simulates the ambient condition of diesel engines at start of fuel injection. ECN is a collaboration network with a purpose to provide an open forum for international collaboration among experimental and computational researchers in engine combustion. The main objective of ECN is to establish an internet library of well-documented experiments that are appropriate for model validation and the advancement of scientific understanding of combustion at conditions specific to engines. Therefore repetitive experiments were carried out to ensure the high repeatability of the ambient conditions for the fuel spray in CVCC. The ambient temperature was varied from 750 to 930 K while the density was fixed. The injection pressure of the fuel was varied from 50 to 150 MPa. The spray was injected in both nonreacting (O2 concentration of 0%) and reacting conditions (O2 concentration of 15%) to examine the spray and the combustion characteristics. Direct imaging with Mie Scattering was used to obtain the liquid penetration length. Shadowgraph was implemented to observe vapor length and lift-off length at non-reacting and reacting conditions, respectively. Pressure transducer data was analyzed to determine the ignition delay with respect to the spray and ambient conditions. Liquid penetration length increased as the injection pressure was increased or the ambient temperature decreased. The effects of injection pressure on the liquid penetration length decreased, however, as the ambient temperature was increased. The result from fine atomization of the fuel with higher injection pressure was diminished at higher ambient temperature. The increasing speed of vapor length was higher with higher injection pressure; however, the vapor length itself did not exhibited any clear evidence of change with respect to ambient temperature. It remained unchanged maybe due to fixed ambient density condition. Lower lift-off length of the spray was observed with higher ambient temperature and low injection pressure. The ignition delay was decreased as the ambient temperature or the injection pressure was increased.
|Previous||황준식, 배충식, “폐식용유 바이오디젤과 디젤을 적용한 대형 디젤 엔진의 입자상 물질 특성 비교”, 제 48회 KOSCO Symposium, 2014. 5|
|Next||김재헌, 배충식, 최명식, “가변 밸브 timing과 duration이 가솔린 엔진 연비 특성에 미치는 영향”, 2014 대한 기계학회 추계학술대회, 2014. 11.|