Blow-out of nonpremixed turbulent jet flames at sub-atmospheric pressures

Handle URI:
http://hdl.handle.net/10754/622178
Title:
Blow-out of nonpremixed turbulent jet flames at sub-atmospheric pressures
Authors:
Wang, Qiang; Hu, Longhua; Chung, Suk-Ho ( 0000-0001-8782-312X )
Abstract:
Blow-out limits of nonpremixed turbulent jet flames in quiescent air at sub-atmospheric pressures (50–100 kPa) were studied experimentally using propane fuel with nozzle diameters ranging 0.8–4 mm. Results showed that the fuel jet velocity at blow-out limit increased with increasing ambient pressure and nozzle diameter. A Damköhler (Da) number based model was adopted, defined as the ratio of characteristic mixing time and characteristic reaction time, to include the effect of pressure considering the variations in laminar burning velocity and thermal diffusivity with pressure. The critical lift-off height at blow-out, representing a characteristic length scale for mixing, had a linear relationship with the theoretically predicted stoichiometric location along the jet axis, which had a weak dependence on ambient pressure. The characteristic mixing time (critical lift-off height divided by jet velocity) adjusted to the characteristic reaction time such that the critical Damköhler at blow-out conditions maintained a constant value when varying the ambient pressure.
KAUST Department:
Clean Combustion Research Center
Citation:
Wang Q, Hu L, Chung SH (2017) Blow-out of nonpremixed turbulent jet flames at sub-atmospheric pressures. Combustion and Flame 176: 358–360. Available: http://dx.doi.org/10.1016/j.combustflame.2016.11.016.
Publisher:
Elsevier BV
Journal:
Combustion and Flame
Issue Date:
9-Dec-2016
DOI:
10.1016/j.combustflame.2016.11.016
Type:
Article
ISSN:
0010-2180
Sponsors:
This work was supported by the National Natural Science Foundation of China (NSFC) under Grant no. 51606057, Key Project of NSFC under Grant no. 51636008, Excellent Young Scientist Fund of NSFC under Grant no. 51422606, Newton Advanced Fellowship (RS Grant no. NA140102; NSFC Grant no. 5141101261), Key Research Program of Frontier Sciences, Chinese Academy of Science (CAS) under Grant no. QYZDB-SSW-JSC029, Fok Ying Tong Education Foundation under Grant no. 151056, Fundamental Research Funds for the Central Universities under Grant no. WK2320000035, and China Postdoctoral Science Foundation (No. 2016M590580). SHC was supported by King Abdullah University of Science and Technology (KAUST).
Additional Links:
http://www.sciencedirect.com/science/article/pii/S001021801630356X
Appears in Collections:
Articles; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorWang, Qiangen
dc.contributor.authorHu, Longhuaen
dc.contributor.authorChung, Suk-Hoen
dc.date.accessioned2017-01-02T08:42:36Z-
dc.date.available2017-01-02T08:42:36Z-
dc.date.issued2016-12-09en
dc.identifier.citationWang Q, Hu L, Chung SH (2017) Blow-out of nonpremixed turbulent jet flames at sub-atmospheric pressures. Combustion and Flame 176: 358–360. Available: http://dx.doi.org/10.1016/j.combustflame.2016.11.016.en
dc.identifier.issn0010-2180en
dc.identifier.doi10.1016/j.combustflame.2016.11.016en
dc.identifier.urihttp://hdl.handle.net/10754/622178-
dc.description.abstractBlow-out limits of nonpremixed turbulent jet flames in quiescent air at sub-atmospheric pressures (50–100 kPa) were studied experimentally using propane fuel with nozzle diameters ranging 0.8–4 mm. Results showed that the fuel jet velocity at blow-out limit increased with increasing ambient pressure and nozzle diameter. A Damköhler (Da) number based model was adopted, defined as the ratio of characteristic mixing time and characteristic reaction time, to include the effect of pressure considering the variations in laminar burning velocity and thermal diffusivity with pressure. The critical lift-off height at blow-out, representing a characteristic length scale for mixing, had a linear relationship with the theoretically predicted stoichiometric location along the jet axis, which had a weak dependence on ambient pressure. The characteristic mixing time (critical lift-off height divided by jet velocity) adjusted to the characteristic reaction time such that the critical Damköhler at blow-out conditions maintained a constant value when varying the ambient pressure.en
dc.description.sponsorshipThis work was supported by the National Natural Science Foundation of China (NSFC) under Grant no. 51606057, Key Project of NSFC under Grant no. 51636008, Excellent Young Scientist Fund of NSFC under Grant no. 51422606, Newton Advanced Fellowship (RS Grant no. NA140102; NSFC Grant no. 5141101261), Key Research Program of Frontier Sciences, Chinese Academy of Science (CAS) under Grant no. QYZDB-SSW-JSC029, Fok Ying Tong Education Foundation under Grant no. 151056, Fundamental Research Funds for the Central Universities under Grant no. WK2320000035, and China Postdoctoral Science Foundation (No. 2016M590580). SHC was supported by King Abdullah University of Science and Technology (KAUST).en
dc.publisherElsevier BVen
dc.relation.urlhttp://www.sciencedirect.com/science/article/pii/S001021801630356Xen
dc.subjectNonpremixed turbulent jet flameen
dc.subjectBlow-out limiten
dc.subjectSub-atmospheric pressureen
dc.subjectLaminar burning velocityen
dc.subjectDamköhler numberen
dc.titleBlow-out of nonpremixed turbulent jet flames at sub-atmospheric pressuresen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.identifier.journalCombustion and Flameen
dc.contributor.institutionUniversity of Science and Technology of China, State Key Laboratory of Fire Science, Hefei, Anhui 230026, Chinaen
dc.contributor.institutionHefei University of Technology, School of Automotive and Transportation Engineering, Hefei, Anhui 230009, Chinaen
kaust.authorChung, Suk-Hoen
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