고온ㆍ고압 조건에서 바이오디젤의 가연한계 예측

• Published in: 한국분무공학회지 Vol. 24; no. 4; pp. 157 - 162
• Main Authors: 임영찬, Young Chan Lim, 정준우, Jun Woo Jung, 서현규, Hyun Kyu Suh
• Format: Journal Article
• Language: Korean
• Published: 한국분무공학회 31.12.2019
• Subjects: Ambient condition; Biodiesel; Diesel; Flammability limits; HCCI; Homogeneous combustion; 가연한계; 균질 연소; 균질혼합 압축착화; 기계공학; 디젤; 바이오디젤; 분위기 조건
• ISSN: 1226-2277
• DOI: 10.15435/JILASSKR.2019.24.4.157

This numerical study was analyzed to predict the flammability limits of biodiesel and diesel fuels in the high temperature and pressure conditions. To achieve this, the biodiesel fuel was simulated with the chemical species of n-heptane (n-C 7 H 16 ), methyl decanoate (C 11 H 22 O 2 ), and methyl-9-decenoate (C 11 H 20 O 2 ), and the diesel fuel was substituted the chemical species of n-heptane. The closed 0-D homogeneous reactor model which was employed the 1100 K of ambient temperature and 35 atm of ambient pressure was used for the simulation of constant volume combustion, and the equivalence ratio was changed from 0.3 to 2.5 conditions. In addition, a comparative analysis study was conducted with the results of HCCI engine simulation and flammability limits according to the changes of equivalence ratio. The results of combustion temperature, pressure, and ignition delay were increased when the equivalence ratio elevated from 0.3 to 1.3 conditions because the increase in fuel oxidation rate affects the chemical reaction of the overall combustion process. Furthermore, the CO and NOx production under the rich combustion conditions are considered to have a trade off relationship since the OH radicals and O 2 chemical species are greatly affected the CO and NOx production and oxidation processes.