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Laminar burning velocities of methane-air flames

Pritchard, R 1972, Laminar burning velocities of methane-air flames , PhD thesis, Salford : University of Salford.

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    Abstract

    The properties of methane are of considerable significance at the present time in the United Kingdom following the discovery of large quantities of natural gas under the North Sea. One property of particular interest, mainly because of its importance in connection with flame stability is burning velocity. The concept of burning velocity as a physicochemical constant for a particular reactant mixture was first suggested by Mallard and Le Chatelier (l) nearly a century ago when they referred to "la vitesse normale", a characteristic of "deflagration" as distinct from detonation. Over thirty years ago, Coward and Payman (2) considered that "the fundamental speed of flame is the most difficult of all the factors to analyze .... and when physicochemical hypotheses are formulated, they must be tested by measurements of the fundamental speed. What measurements are available?" The derivation of burning velocities for hydrocarbon-air flames from fundamental data is now a not-too-distant prospect (3) following the development of a satisfactory predictive method for hydrogen flames. However, until this becomes fact, and afterwards for comparative purposes, we must reiterate Coward and Payman's question. "What measurements are available?" There are in fact many measurements available; the burning velocity of methane-air flames has been the subject of many experimental investigations over the years. However, there exist considerable differences in the results of various workers (b) and no agreement on a standardized method exists. Furthermore the range of mixture composition over which burning velocity data are available is somewhat limited. As Andrews and Bradley (It) have recently stated, although the theoretical definition of burning velocity is simple, unfortunately the same cannot be said of its practical measurement. The theoretical definition of burning velocity relates to the unidimensional flame model and is the velocity with which a plane flame front moves normal to its surface through the adjacent unburned gas. It is an invariant property of the reactant mixture depending only on the composition and state of the initial mixture.

    Item Type: Thesis (PhD)
    Contributors: Edmondson, H(Supervisor)
    Schools: Colleges and Schools > College of Science & Technology
    Colleges and Schools > College of Science & Technology > School of Computing, Science and Engineering
    Depositing User: Institutional Repository
    Date Deposited: 03 Oct 2012 14:34
    Last Modified: 19 Feb 2014 10:46
    URI: http://usir.salford.ac.uk/id/eprint/26865

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