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Turbulent consumption speed via local dilatation rate measurements in a premixed bunsen jet
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.
2013 (English)In: Combustion and Flame, ISSN 0010-2180, E-ISSN 1556-2921, Vol. 160, no 10, 2029-2037 p.Article in journal (Refereed) Published
Abstract [en]

The mean local reaction rate related to the average expansion across the front and computed from the mean velocity divergence is evaluated in this work. Measurements are carried out in a air/methane premixed jet flame by combined PIV/LIF acquisitions. The procedure serves the purpose of obtaining values of a turbulent flame speed, namely the local turbulent consumption speed SLC, as a function of the position along the bunsen flame. With the further position that the flamelet assumption provides a proportionality between turbulent burning speed normalized with the laminar unstretched one and the turbulent to average flame surface ratio, the proportionality constant, i.e., the stretching factor becomes available. The results achieved so far show the existence of a wide region along which the bunsen flame front has a constant stretching factor which apparently depends only on the ratio between turbulent fluctuations and laminar flame speed and on the jet Reynolds number.

Place, publisher, year, edition, pages
2013. Vol. 160, no 10, 2029-2037 p.
Keyword [en]
Flame stretch, Flamelet, LIF, PIV, Premixed combustion, Turbulent combustion
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-126042DOI: 10.1016/j.combustflame.2013.04.013ISI: 000322848200011ScopusID: 2-s2.0-84880643926OAI: diva2:641762

QC 20130819

Available from: 2013-08-19 Created: 2013-08-19 Last updated: 2013-09-09Bibliographically approved

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Picano, Francesco
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MechanicsLinné Flow Center, FLOW
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