Fire Science and Technology
Online ISSN : 1882-0492
Print ISSN : 0285-9521
ISSN-L : 0285-9521
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Volume 2, Issue 1
Displaying 1-4 of 4 articles from this issue
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Science
  • Thermal Instability in Transient Compartment Fire
    -An Approach to Characterize Flashover and Estimate its Mechanisms-
    Yuji Hasemi
    1982 Volume 2 Issue 1 Pages 1-16
    Published: 1982
    Released on J-STAGE: September 16, 2009
    DOIhttps://doi.org/10.3210/fst.2.1
    JOURNAL FREE ACCESS
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    One approach to characterize flashover in transient compartment fire and to clarify the physical or chemical processes which promote flashover is shown. This approach correlates the onset of flashover with the appearance of thermal instability, which is represented mathematically by the irregularity of the Jacobian of the energy conservation equations describing the growth of fire. The process promoting flashover is defined as those which cause thermal instability, and the discriminants to investigate the processes promoting thermal instability are derived. Some typical examples of the processes promoting flashover are studied.
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  • Controlling Mechanisms of Flame Spread
    A. Carlos Fernandez-Pello, Toshisuke Hirano
    1982 Volume 2 Issue 1 Pages 17-54
    Published: 1982
    Released on J-STAGE: September 16, 2009
    DOIhttps://doi.org/10.3210/fst.2.17
    JOURNAL FREE ACCESS
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    Recent advances in the experimental study of the mechanisms controlling the spread of flames over the surface of combustible solids are summarized in this work. The heat transfer and gas phase chemical kinetic aspects of the flame spread process are addressed separately for the spread of flames in oxidizing flows that oppose or concur with the direction of propagation. The realization that in most practical situations, the spread of fire in opposed flows occurs at near extinction or non-propagation conditions is particularly significant. Under these circumstances, gas phase chemical kinetics plays a critical role and it must be considered if realistic descriptions of the flame spread process are attempted. In the concurrent mode of flame spread, heat transfer from the flame to the unburnt fuel appears to be the primary controlling mechanism. Although gas phase chemical kinetics is unimportant in the flame spread process, it is important in the establishment and extension of the diffusion flame that generates the spread process. The current experimental observations, although still in need of further verification, provide insight toward the development of accurate descriptions of the flame spread process.
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  • Statistical Analysis of Flashover
    Yasaburo Morishita
    1982 Volume 2 Issue 1 Pages 55-65
    Published: 1982
    Released on J-STAGE: September 16, 2009
    DOIhttps://doi.org/10.3210/fst.2.55
    JOURNAL FREE ACCESS
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    Many successful fire tests were carried out so far and are now being accumulated as the data base which can be analysed statistically by an electric computer. In this paper, by statistically analysing such accumulated fire test data, the effects of the variour factors on the flashover time and the presence of flashover in fire spread process are estimated, besides, the domain where flashover occurs is shown on the two-dimensional Euclidian space defined by the linear sum of the values given to the respective levels of the factors as the result of the analysis.
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