Stretch rate effects and flame surface densities in premixed turbulent combustion up to 1.25 MPa

Handle URI:
http://hdl.handle.net/10754/594163
Title:
Stretch rate effects and flame surface densities in premixed turbulent combustion up to 1.25 MPa
Authors:
Bagdanavicius, Audrius; Bowen, Phil J.; Bradley, Derek; Lawes, Malcolm; Mansour, Morkous S. ( 0000-0002-5002-1403 )
Abstract:
Independent research at two centres using a burner and an explosion bomb has revealed important aspects of turbulent premixed flame structure. Measurements at pressures and temperatures up to 1.25MPa and 673K in the two rigs were aimed at quantifying the influences of flame stretch rate and strain rate Markstein number, Masr , on both turbulent burning velocity and flame surface density. That on burning velocity is expressed through the stretch rate factor, Io , or probability of burning, Pb 0.5. These depend on Masr , but they grow in importance as the Karlovitz stretch factor, K, increases, and are evaluated from the associated burning velocity data. Planar laser tomography was employed to identify contours of reaction progress variable in both rigs. These enabled both an appropriate flame front for the measurement of the turbulent burning velocity to be identified, and flame surface densities, with the associated factors, to be evaluated. In the explosion measurements, these parameters were derived also from the flame surface area, the derived Pb 0.5 factor and the measured turbulent burning velocities. In the burner measurement they were calculated directly from the flame surface density, which was derived from the flame contours.A new overall correlation is derived for the Pb 0.5 factor, in terms of Masr at different K and this is discussed in the light of previous theoretical studies. The wrinkled flame surface area normalised by the area associated with the turbulent burning velocity measurement, and the ratio of turbulent to laminar burning velocity, ut /ul , are also evaluated. The higher the value of Pb0.5, the more effective is an increased flame wrinkling in increasing ut /ul A correlation of the product of k and the laminar flame thickness with Karlovitz stretch factor and Markstein number is explored using the present data and those of other workers. Some generality is revealed, enabling the wave length associated with the spatial change in mean reaction progress variable to be expressed by the number of laminar flame thicknesses, and the flame volume to be found. © 2015 The Combustion Institute.
KAUST Department:
Clean Combustion Research Center
Citation:
Bagdanavicius A, Bowen PJ, Bradley D, Lawes M, Mansour MS (2015) Stretch rate effects and flame surface densities in premixed turbulent combustion up to 1.25 MPa. Combustion and Flame 162: 4158–4166. Available: http://dx.doi.org/10.1016/j.combustflame.2015.08.007.
Publisher:
Elsevier BV
Journal:
Combustion and Flame
Issue Date:
Nov-2015
DOI:
10.1016/j.combustflame.2015.08.007
Type:
Article
ISSN:
0010-2180
Appears in Collections:
Articles; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorBagdanavicius, Audriusen
dc.contributor.authorBowen, Phil J.en
dc.contributor.authorBradley, Dereken
dc.contributor.authorLawes, Malcolmen
dc.contributor.authorMansour, Morkous S.en
dc.date.accessioned2016-01-19T13:22:58Zen
dc.date.available2016-01-19T13:22:58Zen
dc.date.issued2015-11en
dc.identifier.citationBagdanavicius A, Bowen PJ, Bradley D, Lawes M, Mansour MS (2015) Stretch rate effects and flame surface densities in premixed turbulent combustion up to 1.25 MPa. Combustion and Flame 162: 4158–4166. Available: http://dx.doi.org/10.1016/j.combustflame.2015.08.007.en
dc.identifier.issn0010-2180en
dc.identifier.doi10.1016/j.combustflame.2015.08.007en
dc.identifier.urihttp://hdl.handle.net/10754/594163en
dc.description.abstractIndependent research at two centres using a burner and an explosion bomb has revealed important aspects of turbulent premixed flame structure. Measurements at pressures and temperatures up to 1.25MPa and 673K in the two rigs were aimed at quantifying the influences of flame stretch rate and strain rate Markstein number, Masr , on both turbulent burning velocity and flame surface density. That on burning velocity is expressed through the stretch rate factor, Io , or probability of burning, Pb 0.5. These depend on Masr , but they grow in importance as the Karlovitz stretch factor, K, increases, and are evaluated from the associated burning velocity data. Planar laser tomography was employed to identify contours of reaction progress variable in both rigs. These enabled both an appropriate flame front for the measurement of the turbulent burning velocity to be identified, and flame surface densities, with the associated factors, to be evaluated. In the explosion measurements, these parameters were derived also from the flame surface area, the derived Pb 0.5 factor and the measured turbulent burning velocities. In the burner measurement they were calculated directly from the flame surface density, which was derived from the flame contours.A new overall correlation is derived for the Pb 0.5 factor, in terms of Masr at different K and this is discussed in the light of previous theoretical studies. The wrinkled flame surface area normalised by the area associated with the turbulent burning velocity measurement, and the ratio of turbulent to laminar burning velocity, ut /ul , are also evaluated. The higher the value of Pb0.5, the more effective is an increased flame wrinkling in increasing ut /ul A correlation of the product of k and the laminar flame thickness with Karlovitz stretch factor and Markstein number is explored using the present data and those of other workers. Some generality is revealed, enabling the wave length associated with the spatial change in mean reaction progress variable to be expressed by the number of laminar flame thicknesses, and the flame volume to be found. © 2015 The Combustion Institute.en
dc.publisherElsevier BVen
dc.subjectBurning velocityen
dc.subjectFlame stretch rateen
dc.subjectFlame surface densityen
dc.subjectMarkstein numberen
dc.subjectTurbulent premixed flameen
dc.titleStretch rate effects and flame surface densities in premixed turbulent combustion up to 1.25 MPaen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.identifier.journalCombustion and Flameen
dc.contributor.institutionDepartment of Engineering, University of Leicester, Leicester LE1 7RH, UKen
dc.contributor.institutionCardiff School of Engineering, Cardiff University, Cardiff CF24 3AA, UKen
dc.contributor.institutionSchool of Mechanical Engineering, University of Leeds, Leeds LS2 9JT, UKen
dc.contributor.institutionDepartment of Mechanical Engineering, Helwan University, Cairo, Egypten
kaust.authorMansour, Morkous S.en
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