The CO/NOx emissions of swirled, strongly pulsed jet diffusion flames

Handle URI:
http://hdl.handle.net/10754/563559
Title:
The CO/NOx emissions of swirled, strongly pulsed jet diffusion flames
Authors:
Liao, Ying-Hao; Hermanson, James C.
Abstract:
The CO and NOx exhaust emissions of swirled, strongly pulsed, turbulent jet diffusion flames were studied experimentally in a coflow swirl combustor. Measurements of emissions were performed on the combustor centerline using standard emission analyzers combined with an aspirated sampling probe located downstream of the visible flame tip. The highest levels of CO emissions are generally found for compact, isolated flame puffs, which is consistent with the quenching due to rapid dilution with excess air. The imposition of swirl generally results in a decrease in CO levels by up to a factor of 2.5, suggesting more rapid and compete fuel/air mixing by imposing swirl in the coflow stream. The levels of NO emissions for most cases are generally below the steady-flame value. The NO levels become comparable to the steady-flame value for sufficiently short jet-off times. The swirled coflow air can, in some cases, increase the NO emissions due to a longer combustion residence time due to the flow recirculation within the swirl-induced recirculation zone. Scaling relations, when taking into account the impact of air dilution over an injection cycle on the flame length, reveal a strong correlation between the CO emissions and the global residence time. However, the NO emissions do not successfully correlate with the global residence time. For some specific cases, a compact flame with a simultaneous decrease in both CO and NO emissions compared to the steady flames was observed. © Copyright © Taylor & Francis Group, LLC.
KAUST Department:
Clean Combustion Research Center; Physical Sciences and Engineering (PSE) Division
Publisher:
Informa UK Limited
Journal:
Combustion Science and Technology
Issue Date:
28-May-2014
DOI:
10.1080/00102202.2014.885511
Type:
Article
ISSN:
00102202
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorLiao, Ying-Haoen
dc.contributor.authorHermanson, James C.en
dc.date.accessioned2015-08-03T11:54:28Zen
dc.date.available2015-08-03T11:54:28Zen
dc.date.issued2014-05-28en
dc.identifier.issn00102202en
dc.identifier.doi10.1080/00102202.2014.885511en
dc.identifier.urihttp://hdl.handle.net/10754/563559en
dc.description.abstractThe CO and NOx exhaust emissions of swirled, strongly pulsed, turbulent jet diffusion flames were studied experimentally in a coflow swirl combustor. Measurements of emissions were performed on the combustor centerline using standard emission analyzers combined with an aspirated sampling probe located downstream of the visible flame tip. The highest levels of CO emissions are generally found for compact, isolated flame puffs, which is consistent with the quenching due to rapid dilution with excess air. The imposition of swirl generally results in a decrease in CO levels by up to a factor of 2.5, suggesting more rapid and compete fuel/air mixing by imposing swirl in the coflow stream. The levels of NO emissions for most cases are generally below the steady-flame value. The NO levels become comparable to the steady-flame value for sufficiently short jet-off times. The swirled coflow air can, in some cases, increase the NO emissions due to a longer combustion residence time due to the flow recirculation within the swirl-induced recirculation zone. Scaling relations, when taking into account the impact of air dilution over an injection cycle on the flame length, reveal a strong correlation between the CO emissions and the global residence time. However, the NO emissions do not successfully correlate with the global residence time. For some specific cases, a compact flame with a simultaneous decrease in both CO and NO emissions compared to the steady flames was observed. © Copyright © Taylor & Francis Group, LLC.en
dc.publisherInforma UK Limiteden
dc.subjectCO emissionsen
dc.subjectDiffusion flameen
dc.subjectNO emissionsen
dc.subjectPulsed flameen
dc.subjectSwirled flameen
dc.titleThe CO/NOx emissions of swirled, strongly pulsed jet diffusion flamesen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalCombustion Science and Technologyen
dc.contributor.institutionDepartment of Aeronautics and Astronautics, University of Washington, Seattle, WA, United Statesen
kaust.authorLiao, Ying-Haoen
All Items in KAUST are protected by copyright, with all rights reserved, unless otherwise indicated.