Measurements and correlations of turbulent burning velocities over wide ranges of fuels and elevated pressures

Handle URI:
http://hdl.handle.net/10754/562594
Title:
Measurements and correlations of turbulent burning velocities over wide ranges of fuels and elevated pressures
Authors:
Bradley, Derek; Lawes, Malcolm; Liu, Kexin; Mansour, Morkous S. ( 0000-0002-5002-1403 )
Abstract:
The implosion technique has been used to extend measurements of turbulent burning velocities over greater ranges of fuels and pressures. Measurements have been made up to 3.5 MPa and at strain rate Markstein numbers as low as 23. The implosion technique, with spark ignition at two opposite wall positions within a fan-stirred spherical bomb is capable of measuring turbulent burning velocities, at higher pressures than is possible with central ignition. Pressure records and schlieren high speed photography define the rate of burning and the smoothed area of the flame front. The first aim of the study was to extend the previous measurements with ethanol and propane-air, with further measurements over wider ranges of fuels and equivalence ratios with mixtures of hydrogen, methane, 10% hydrogen-90% methane, toluene, and i-octane, with air. The second aim was to study further the low turbulence regime in which turbulent burning co-exists with laminar flame instabilities. Correlations are presented of turbulent burning velocity normalised by the effective rms turbulent velocity acting on the flame front, ut=u0k , with the Karlovitz stretch factor, K, for different strain rate Markstein numbers, a decrease in which increases ut=u0k . Experimental correlations are presented for the present measurements, combined with previous ones. Different burning regimes are also identified, extending from that of mixed turbulence/laminar instability at low values of K to that at high values of K, in which ut=u0k is gradually reduced due to increasing localised flame extinctions. © 2012 The Combustion Institute.
KAUST Department:
Clean Combustion Research Center; Mechanical Engineering Program
Publisher:
Elsevier
Journal:
Proceedings of the Combustion Institute
Issue Date:
Jan-2013
DOI:
10.1016/j.proci.2012.06.060
Type:
Article
ISSN:
15407489
Sponsors:
The authors are grateful to the University of Helwan for support of M.S.M.
Appears in Collections:
Articles; Mechanical Engineering Program; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorBradley, Dereken
dc.contributor.authorLawes, Malcolmen
dc.contributor.authorLiu, Kexinen
dc.contributor.authorMansour, Morkous S.en
dc.date.accessioned2015-08-03T10:44:03Zen
dc.date.available2015-08-03T10:44:03Zen
dc.date.issued2013-01en
dc.identifier.issn15407489en
dc.identifier.doi10.1016/j.proci.2012.06.060en
dc.identifier.urihttp://hdl.handle.net/10754/562594en
dc.description.abstractThe implosion technique has been used to extend measurements of turbulent burning velocities over greater ranges of fuels and pressures. Measurements have been made up to 3.5 MPa and at strain rate Markstein numbers as low as 23. The implosion technique, with spark ignition at two opposite wall positions within a fan-stirred spherical bomb is capable of measuring turbulent burning velocities, at higher pressures than is possible with central ignition. Pressure records and schlieren high speed photography define the rate of burning and the smoothed area of the flame front. The first aim of the study was to extend the previous measurements with ethanol and propane-air, with further measurements over wider ranges of fuels and equivalence ratios with mixtures of hydrogen, methane, 10% hydrogen-90% methane, toluene, and i-octane, with air. The second aim was to study further the low turbulence regime in which turbulent burning co-exists with laminar flame instabilities. Correlations are presented of turbulent burning velocity normalised by the effective rms turbulent velocity acting on the flame front, ut=u0k , with the Karlovitz stretch factor, K, for different strain rate Markstein numbers, a decrease in which increases ut=u0k . Experimental correlations are presented for the present measurements, combined with previous ones. Different burning regimes are also identified, extending from that of mixed turbulence/laminar instability at low values of K to that at high values of K, in which ut=u0k is gradually reduced due to increasing localised flame extinctions. © 2012 The Combustion Institute.en
dc.description.sponsorshipThe authors are grateful to the University of Helwan for support of M.S.M.en
dc.publisherElsevieren
dc.subjectExplosion measurementsen
dc.subjectHigh pressureen
dc.subjectPremixed turbulent flamesen
dc.subjectTurbulent burning velocityen
dc.subjectTurbulent/laminar flame instabilitiesen
dc.titleMeasurements and correlations of turbulent burning velocities over wide ranges of fuels and elevated pressuresen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.contributor.departmentMechanical Engineering Programen
dc.identifier.journalProceedings of the Combustion Instituteen
dc.contributor.institutionSchool of Mechanical Engineering, University of Leeds, Leeds LS2 9JT, United Kingdomen
dc.contributor.institutionSiemens Industrial Turbomachinery (SIT) Ltd., Lincoln, United Kingdomen
kaust.authorMansour, Morkous S.en
All Items in KAUST are protected by copyright, with all rights reserved, unless otherwise indicated.