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dc.contributor.authorKailasanathan, Ranjith Kumar Abhinavam
dc.contributor.authorZhang, Ji
dc.contributor.authorFang, Tiegang
dc.contributor.authorRoberts, William L.
dc.date.accessioned2015-08-03T11:54:19Z
dc.date.available2015-08-03T11:54:19Z
dc.date.issued2014-05-20
dc.identifier.issn00102202
dc.identifier.doi10.1080/00102202.2013.878710
dc.identifier.urihttp://hdl.handle.net/10754/563553
dc.description.abstractSoot surface temperature and volume fraction are measured in ethylene/air coflowing laminar diffusion flames at high pressures, diluted with one of four diluents (argon, helium, nitrogen, and carbon dioxide) using a two-color technique. Both temperature and soot measurements presented are line-of-sight averages. The results aid in understanding the kinetic and thermodynamic behavior of the soot formation and oxidation chemistry with changes in diluents, ultimately leading to possible methods of reducing soot emission from practical combustion hardware. The diluted fuel and coflow exit velocities (top-hat profiles) were matched at all pressures to minimize shear effects. In addition to the velocity-matched flow rates, the mass fluxes were held constant for all pressures. Addition of a diluent has a pronounced effect on both the soot surface temperature and volume fraction, with the helium diluted flame yielding the maximum and carbon dioxide diluted flame yielding minimum soot surface temperature and volume fraction. At low pressures, peak soot volume fraction exists at the tip of the flame, and with an increase in pressure, the location shifts lower to the wings of the flame. Due to the very high diffusivity of helium, significantly higher temperature and volume fraction are measured and explained. Carbon dioxide has the most dramatic soot suppression effect. By comparing the soot yield with previously measured soot precursor concentrations in the same flame, it is clear that the lower soot yield is a result of enhanced oxidation rates rather than a reduction in precursor formation. Copyright © 2014 Taylor & Francis Group, LLC.
dc.description.sponsorshipThis material is based upon work supported by, or in part by, the U.S. Army Research Laboratory and the U.S. Army Research Office under grant W911NF-10-1-0118.
dc.publisherInforma UK Limited
dc.subjectElevated pressure
dc.subjectLaminar diffusion flame
dc.subjectSoot surface temperature
dc.subjectSoot volume fraction
dc.titleEffects of diluents on soot surface temperature and volume fraction in diluted ethylene diffusion flames at pressure
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.journalCombustion Science and Technology
dc.contributor.institutionDepartment of Mechanical and Aerospace Engineering, Applied Energy Research Laboratory, North Carolina State University, Raleigh, NC, United States
kaust.personRoberts, William L.
dc.date.published-online2014-05-20
dc.date.published-print2014-06-03


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