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dc.contributor.authorLuong, Minh Bau
dc.contributor.authorYu, Gwang Hyeon
dc.contributor.authorChung, Suk-Ho
dc.contributor.authorYoo, Chun Sang
dc.date.accessioned2017-01-02T09:08:24Z
dc.date.available2017-01-02T09:08:24Z
dc.date.issued2016-10-11
dc.identifier.citationLuong MB, Yu GH, Chung SH, Yoo CS (2016) Ignition of a lean PRF/air mixture under RCCI/SCCI conditions: A comparative DNS study. Proceedings of the Combustion Institute. Available: http://dx.doi.org/10.1016/j.proci.2016.08.038.
dc.identifier.issn1540-7489
dc.identifier.doi10.1016/j.proci.2016.08.038
dc.identifier.urihttp://hdl.handle.net/10754/622300
dc.description.abstractThe ignition characteristics of a lean primary reference fuel (PRF)/air mixture under reactivity controlled compression ignition (RCCI) and stratified charge compression ignition (SCCI) conditions are investigated using 2-D direct numerical simulations (DNSs) with a 116-species reduced mechanism of PRF oxidation. For RCCI combustion, n-heptane and iso-octane are used as two different reactivity fuels and the corresponding global PRF number is PRF50 which is also used as a single fuel for SCCI combustion. The 2-D DNSs of RCCI/SCCI combustion are performed by varying degree of fuel stratification, r, and turbulence intensity, u', at different initial mean temperature, T , with negatively-correlated T-r fields. It is found that in the low- and intermediate-temperature regimes, the overall combustion of RCCI cases occurs earlier and its mean heat release rate (HRR) is more distributed over time than those of the corresponding SCCI cases. This is because PRF number stratification, PRF', plays a dominant role and T' has a negligible effect on the overall combustion within the negative temperature coefficient (NTC) regime. In the high-temperature regime, however, the difference between RCCI and SCCI combustion becomes marginal because the ignition of the PRF/air mixture is highly-sensitive to T' rather than PRF' and ϕ(symbol)'. The Damköhler number analysis verifies that the mean HRR is more distributed over time with increasing r because the portion of deflagration mode of combustion becomes larger with increasing fuel stratification. Finally, it is found that the overall combustion of both RCCI and SCCI cases becomes more like the 0-D ignition with increasing u' due to the homogenization of initial mixture by turbulent mixing.
dc.publisherElsevier BV
dc.subjectDirect numerical simulation (DNS)
dc.subjectHomogeneous charge compression ignition (HCCI)
dc.subjectNegative temperature coefficient(NTC)
dc.subjectReactivity controlled compression ignition (RCCI)
dc.subjectStratified charge compression ignition (SCCI)
dc.titleIgnition of a lean PRF/air mixture under RCCI/SCCI conditions: A comparative DNS study
dc.typeArticle
dc.contributor.departmentClean Combustion Research Center
dc.contributor.departmentMechanical Engineering Program
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Division
dc.identifier.journalProceedings of the Combustion Institute
dc.contributor.institutionDepartment of Mechanical Engineering, Ulsan National Institute of Science and Technology, Ulsan 689-798, Republic of Korea
dc.contributor.institutionSchool of Mechanical and Nuclear Engineering, Ulsan National Institute of Science and Technology, Ulsan 689-798, Republic of Korea
kaust.personChung, Suk-Ho
dc.date.published-online2016-10-11
dc.date.published-print2017


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