지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록· 키워드
오류제보하기
The ignition and combustion processes of alternative fuels need thorough understanding within a ‘beyond-RON’ regime, under temperature and pressure conditions relevant to compression-ignition engines, in contrast to their spark-ignition counterparts. This study investigates the low- and high-temperature ignition and combustion processes in high-pressure spray flames of primary reference fuel (PRF80) using simultaneous 50-kHz formaldehyde (CH2O) planar laser-induced fluorescence (PLIF) and 100-kHz schlieren imaging. The experiments are performed within a constant-volume pre-burn chamber, utilizing a highly convergent single-hole injector provided by the Engine Combustion Network (ECN), specifically Spray A-3. Simultaneous high-speed imaging diagnostics reveal the early cool flame formation and its evolution, the sequential consumption of formaldehyde, high-temperature ignition, and the formation of polycyclic aromatic hydrocarbons (PAHs) in high-pressure PRF80 spray flames. At lower temperatures, a gradual increase in pressure traces and apparent heat release rate (AHRR) indicates low-temperature heat release (LTHR), with numerous spikes observed before high-temperature ignition. The efficiency decreases compared to higher temperatures at the lowest tested temperature condition (899 K). The differences in low and high-temperature ignition delay times decrease rapidly with increasing ambient temperature, both becoming shorter. Additionally, the flame lift-off length (FLOL) and CH₂O inception distances shorten as the ambient temperatures rise.
목차
ABSTRACT
1. 서론
2. 실험 장비 및 분석 기법
3. 실험 결과 및 고찰
4. 결론
References
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