Bradley, D, Lawes, M, Liu, K et al. (1 more author) (2013) Measurements and correlations of turbulent burning velocities over wide ranges of fuels and elevated pressures. Proceedings of the Combustion Institute, 34 (1). 1519 - 1526. ISSN 1540-7489
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/uk′, with the Karlovitz stretch factor, K, for different strain rate Markstein numbers, a decrease in which increases ut/uk′. 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/uk′ is gradually reduced due to increasing localised flame extinctions.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2013, Elsevier. This is an author produced version of a paper published in Proceedings of the Combustion Institute. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Premixed turbulent flames; turbulent burning velocity; high pressure; turbulent/laminar flame instabilities; explosion measurements |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Mechanical Engineering (Leeds) > Institute of Engineering Thermofluids, Surfaces & Interfaces (iETSI) (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 13 Feb 2014 13:39 |
Last Modified: | 15 Sep 2014 02:00 |
Published Version: | http://dx.doi.org/10.1016/j.proci.2012.06.060 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.proci.2012.06.060 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:77763 |