Soot temperature and KL factor for biodiesel and diesel spray combustion in a constant volume combustion chamber

Handle URI:
http://hdl.handle.net/10754/562830
Title:
Soot temperature and KL factor for biodiesel and diesel spray combustion in a constant volume combustion chamber
Authors:
Zhang, Ji; Jing, Wei; Roberts, William L. ( 0000-0003-1999-2831 ) ; Fang, Tiegang
Abstract:
This paper presents measurements of the soot temperature and KL factor for biodiesel and diesel combustion in a constant volume chamber using a two-color technique. This technique uses a high-speed camera coupled with two narrowband filters (550. nm and 650. nm, 10. nm FWHM). After calibration, statistical analysis shows that the uncertainty of the two-color temperature is less than 5%, while it is about 50% for the KL factor. This technique is then applied to the spray combustion of biodiesel and diesel fuels under an ambient oxygen concentration of 21% and ambient temperatures of 800, 1000 and 1200. K. The heat release result shows higher energy utilization efficiency for biodiesel compared to diesel under all conditions; meanwhile, diesel shows a higher pressure increase due to its higher heating value. Biodiesel yields a lower temperature inside the flame area, a longer soot lift-off length, and a smaller soot area compared to diesel. Both the KL factor and the total soot with biodiesel are lower than with diesel throughout the entire combustion process, and this difference becomes larger as the ambient temperature decreases. Biodiesel shows approximately 50-100. K lower temperatures than diesel at the quasi-steady stage for 1000 and 1200. K ambient temperature, while diesel shows a lower temperature than biodiesel at 800. K ambient. This result may raise the question of how important the flame temperature is in explaining the higher NO. x emissions often observed during biodiesel combustion. Other factors may also play an important role in controlling NO. x emissions. Both biodiesel and diesel temperature measurements show a monotonic dependence on the ambient temperature. However, the ambient temperature appears to have a more significant effect on the soot formation and oxidation in diesel combustion, while biodiesel combustion soot characteristics shows relative insensitivity to the ambient temperature. © 2013 Elsevier Ltd.
KAUST Department:
Clean Combustion Research Center; Mechanical Engineering Program; Physical Sciences and Engineering (PSE) Division
Publisher:
Elsevier BV
Journal:
Applied Energy
Issue Date:
Jul-2013
DOI:
10.1016/j.apenergy.2013.02.023
Type:
Article
ISSN:
03062619
Sponsors:
This 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.
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorZhang, Jien
dc.contributor.authorJing, Weien
dc.contributor.authorRoberts, William L.en
dc.contributor.authorFang, Tiegangen
dc.date.accessioned2015-08-03T11:11:51Zen
dc.date.available2015-08-03T11:11:51Zen
dc.date.issued2013-07en
dc.identifier.issn03062619en
dc.identifier.doi10.1016/j.apenergy.2013.02.023en
dc.identifier.urihttp://hdl.handle.net/10754/562830en
dc.description.abstractThis paper presents measurements of the soot temperature and KL factor for biodiesel and diesel combustion in a constant volume chamber using a two-color technique. This technique uses a high-speed camera coupled with two narrowband filters (550. nm and 650. nm, 10. nm FWHM). After calibration, statistical analysis shows that the uncertainty of the two-color temperature is less than 5%, while it is about 50% for the KL factor. This technique is then applied to the spray combustion of biodiesel and diesel fuels under an ambient oxygen concentration of 21% and ambient temperatures of 800, 1000 and 1200. K. The heat release result shows higher energy utilization efficiency for biodiesel compared to diesel under all conditions; meanwhile, diesel shows a higher pressure increase due to its higher heating value. Biodiesel yields a lower temperature inside the flame area, a longer soot lift-off length, and a smaller soot area compared to diesel. Both the KL factor and the total soot with biodiesel are lower than with diesel throughout the entire combustion process, and this difference becomes larger as the ambient temperature decreases. Biodiesel shows approximately 50-100. K lower temperatures than diesel at the quasi-steady stage for 1000 and 1200. K ambient temperature, while diesel shows a lower temperature than biodiesel at 800. K ambient. This result may raise the question of how important the flame temperature is in explaining the higher NO. x emissions often observed during biodiesel combustion. Other factors may also play an important role in controlling NO. x emissions. Both biodiesel and diesel temperature measurements show a monotonic dependence on the ambient temperature. However, the ambient temperature appears to have a more significant effect on the soot formation and oxidation in diesel combustion, while biodiesel combustion soot characteristics shows relative insensitivity to the ambient temperature. © 2013 Elsevier Ltd.en
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.en
dc.publisherElsevier BVen
dc.subjectBiodieselen
dc.subjectConstant volume chamberen
dc.subjectDieselen
dc.subjectSpray combustionen
dc.subjectTwo-color thermometryen
dc.titleSoot temperature and KL factor for biodiesel and diesel spray combustion in a constant volume combustion chamberen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.contributor.departmentMechanical Engineering Programen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalApplied Energyen
dc.contributor.institutionDepartment of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, NC 27695, United Statesen
kaust.authorRoberts, William L.en
All Items in KAUST are protected by copyright, with all rights reserved, unless otherwise indicated.