Narrow band flame emission from dieseline and diesel spray combustion in a constant volume combustion chamber

Handle URI:
http://hdl.handle.net/10754/621747
Title:
Narrow band flame emission from dieseline and diesel spray combustion in a constant volume combustion chamber
Authors:
Wu, Zengyang; Jing, Wei; Zhang, Weibo; Roberts, William L. ( 0000-0003-1999-2831 ) ; Fang, Tiegang
Abstract:
In this paper, spray combustion of diesel (No. 2) and diesel-gasoline blend (dieseline: 80% diesel and 20% gasoline by volume) were investigated in an optically accessible constant volume combustion chamber. Effects of ambient conditions on flame emissions were studied. Ambient oxygen concentration was varied from 12% to 21% and three ambient temperatures were selected: 800 K, 1000 K and 1200 K. An intensified CCD camera coupled with bandpass filters was employed to capture the quasi-steady state flame emissions at 430 nm and 470 nm bands. Under non-sooting conditions, the narrow-band flame emissions at 430 nm and 470 nm can be used as indicators of CH∗ (methylidyne) and HCHO∗ (formaldehyde), respectively. The lift-off length was measured by imaging the OH∗ chemiluminescence at 310 nm. Flame emission structure and intensity distribution were compared between dieseline and diesel at wavelength bands. Flame emission images show that both narrow band emissions become shorter, thinner and stronger with higher oxygen concentration and higher ambient temperature for both fuels. Areas of weak intensity are observed at the flame periphery and the upstream for both fuels under all ambient conditions. Average flame emission intensity and area were calculated for 430 nm and 470 nm narrow-band emissions. At a lower ambient temperature the average intensity increases with increasing ambient oxygen concentration. However, at the 1200 K ambient temperature condition, the average intensity is not increasing monotonically for both fuels. For most of the conditions, diesel has a stronger average flame emission intensity than dieseline for the 430 nm band, and similar phenomena can be observed for the 470 nm band with 800 K and 1200 K ambient temperatures. However, for the 1000 K ambient temperature cases, dieseline has stronger average flame emission intensities than diesel for all oxygen concentrations at 470 nm band. Flame emissions for the two bands have a smaller average emission area under higher ambient oxygen concentration and temperature for both fuels, while dieseline has a slightly larger average flame emission area than diesel for most cases. The experimental findings were further analyzed and discussed based on an empirical model of the distributions of air and fuel. Both experiment results and theoretical model show that dieseline has wider 430 nm and 470 nm band emissions than diesel under all conditions. © 2016 Elsevier Ltd
KAUST Department:
Clean Combustion Research Center
Citation:
Wu Z, Jing W, Zhang W, Roberts WL, Fang T (2016) Narrow band flame emission from dieseline and diesel spray combustion in a constant volume combustion chamber. Fuel 185: 829–846. Available: http://dx.doi.org/10.1016/j.fuel.2016.08.022.
Publisher:
Elsevier BV
Journal:
Fuel
Issue Date:
18-Aug-2016
DOI:
10.1016/j.fuel.2016.08.022
Type:
Article
ISSN:
0016-2361
Sponsors:
This research was supported in part by the Natural Science Foundation under Grant No. CBET-0854174 and by the Saudi Aramco R&D Center through the Clean Combustion Research Center of the King Abdullah University of Science and Technology. 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; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorWu, Zengyangen
dc.contributor.authorJing, Weien
dc.contributor.authorZhang, Weiboen
dc.contributor.authorRoberts, William L.en
dc.contributor.authorFang, Tiegangen
dc.date.accessioned2016-11-03T13:24:05Z-
dc.date.available2016-11-03T13:24:05Z-
dc.date.issued2016-08-18en
dc.identifier.citationWu Z, Jing W, Zhang W, Roberts WL, Fang T (2016) Narrow band flame emission from dieseline and diesel spray combustion in a constant volume combustion chamber. Fuel 185: 829–846. Available: http://dx.doi.org/10.1016/j.fuel.2016.08.022.en
dc.identifier.issn0016-2361en
dc.identifier.doi10.1016/j.fuel.2016.08.022en
dc.identifier.urihttp://hdl.handle.net/10754/621747-
dc.description.abstractIn this paper, spray combustion of diesel (No. 2) and diesel-gasoline blend (dieseline: 80% diesel and 20% gasoline by volume) were investigated in an optically accessible constant volume combustion chamber. Effects of ambient conditions on flame emissions were studied. Ambient oxygen concentration was varied from 12% to 21% and three ambient temperatures were selected: 800 K, 1000 K and 1200 K. An intensified CCD camera coupled with bandpass filters was employed to capture the quasi-steady state flame emissions at 430 nm and 470 nm bands. Under non-sooting conditions, the narrow-band flame emissions at 430 nm and 470 nm can be used as indicators of CH∗ (methylidyne) and HCHO∗ (formaldehyde), respectively. The lift-off length was measured by imaging the OH∗ chemiluminescence at 310 nm. Flame emission structure and intensity distribution were compared between dieseline and diesel at wavelength bands. Flame emission images show that both narrow band emissions become shorter, thinner and stronger with higher oxygen concentration and higher ambient temperature for both fuels. Areas of weak intensity are observed at the flame periphery and the upstream for both fuels under all ambient conditions. Average flame emission intensity and area were calculated for 430 nm and 470 nm narrow-band emissions. At a lower ambient temperature the average intensity increases with increasing ambient oxygen concentration. However, at the 1200 K ambient temperature condition, the average intensity is not increasing monotonically for both fuels. For most of the conditions, diesel has a stronger average flame emission intensity than dieseline for the 430 nm band, and similar phenomena can be observed for the 470 nm band with 800 K and 1200 K ambient temperatures. However, for the 1000 K ambient temperature cases, dieseline has stronger average flame emission intensities than diesel for all oxygen concentrations at 470 nm band. Flame emissions for the two bands have a smaller average emission area under higher ambient oxygen concentration and temperature for both fuels, while dieseline has a slightly larger average flame emission area than diesel for most cases. The experimental findings were further analyzed and discussed based on an empirical model of the distributions of air and fuel. Both experiment results and theoretical model show that dieseline has wider 430 nm and 470 nm band emissions than diesel under all conditions. © 2016 Elsevier Ltden
dc.description.sponsorshipThis research was supported in part by the Natural Science Foundation under Grant No. CBET-0854174 and by the Saudi Aramco R&D Center through the Clean Combustion Research Center of the King Abdullah University of Science and Technology. 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.subjectChemiluminescenceen
dc.subjectDieselineen
dc.subjectFlame structureen
dc.subjectLift-off lengthen
dc.subjectSpray combustionen
dc.titleNarrow band flame emission from dieseline and diesel spray combustion in a constant volume combustion chamberen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.identifier.journalFuelen
dc.contributor.institutionDepartment of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, NC, United Statesen
dc.contributor.institutionSchool of Mechanical Engineering and Automation, Fuzhou University, Fuzhou, Fujian, Chinaen
kaust.authorRoberts, William L.en
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