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dc.contributor.authorZhang, Ji
dc.contributor.authorJing, Wei
dc.contributor.authorRoberts, William L.
dc.contributor.authorFang, Tiegang
dc.date.accessioned2015-08-03T11:14:08Z
dc.date.available2015-08-03T11:14:08Z
dc.date.issued2013-08
dc.identifier.citationZhang, J., Jing, W., Roberts, W. L., & Fang, T. (2013). Effects of ambient oxygen concentration on biodiesel and diesel spray combustion under simulated engine conditions. Energy, 57, 722–732. doi:10.1016/j.energy.2013.05.063
dc.identifier.issn03605442
dc.identifier.doi10.1016/j.energy.2013.05.063
dc.identifier.urihttp://hdl.handle.net/10754/562886
dc.description.abstractThis study investigates the effect of ambient oxygen concentration on biodiesel and diesel spray combustion under simulated compression-ignition engine conditions in a constant-volume chamber. The apparent heat release rate (AHRR) is calculated based on the measured pressure. High-speed imaging of OH* chemiluminescence and natural luminosity (NL) is employed to visualize the combustion process. Temporally and spatially resolved NL and OH* contour plots are obtained. The result indicates that AHRR depends monotonically on the ambient oxygen concentration for both fuels. A lower oxygen concentration yields a slower AHRR increase rate, a lower peak AHRR value, but a higher AHRR value during the burn-out stage when compared with higher ambient oxygen concentration conditions. OH* chemiluminescence and NL contours indicate that biodiesel may experience a longer premixed-combustion duration. The 18% ambient O2 condition works better for biodiesel than diesel in reducing soot luminosity. With 12% O2, diesel combustion is significantly degraded. However, both fuels experience low temperature combustion at 10% O2. These results may imply that biodiesel is able to achieve the desired lower soot production under a moderate oxygen level with higher combustion efficiency, while diesel needs to be burned under very low ambient oxygen concentration for low soot production. © 2013 Elsevier Ltd.
dc.description.sponsorshipThis research was supported in part by the Faculty Research and Professional Development (FRPD) Fund from the North Carolina State University and by the Natural Science Foundation under Grant No. CBET-0854174. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the funding agencies.
dc.publisherElsevier BV
dc.subjectBiodiesel
dc.subjectChemiluminescence
dc.subjectConstant-volume chamber
dc.subjectDiesel
dc.subjectLuminosity
dc.subjectSpray combustion
dc.titleEffects of ambient oxygen concentration on biodiesel and diesel spray combustion under simulated engine conditions
dc.typeArticle
dc.contributor.departmentClean Combustion Research Center
dc.contributor.departmentMechanical Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.contributor.departmenthigh-pressure combustion (HPC) Research Group
dc.identifier.journalEnergy
dc.contributor.institutionDepartment of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, NC 27695, United States
kaust.personRoberts, William L.


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