期刊
PROCEEDINGS OF THE COMBUSTION INSTITUTE
卷 37, 期 3, 页码 3817-3824出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.proci.2018.05.074
关键词
Electric wire; Flame spread rate; Flame length; Flame geometry; Oxygen-concentration effect
资金
- JAXA
The downward flame spread over laboratory electric wire under various oxygen concentrations has been investigated experimentally to improve our knowledge of electric-wire combustion. Two kinds of electrical wire (low-density-polyethylene (LDPE)-insulated copper (Cu) and nickel-chrome (NiCr)) are used in this study. The oxygen concentration of the mixture stream (O-2 and N-2) in the test section is varied between 15 and 41 vol%. Opposed-flow velocity in the test section is fixed at 15 cm/s. For NiCr wire, the flame spread rate ( V-f) and flame length (L-f) monotonically increase with oxygen concentration. For Cu wire, both V-f and L-f show non-monotonic behavior against oxygen concentration. Most interestingly, V-f decreases with oxygen concentration increase in the 25-31% range. Theoretical analysis shows two regimes of variation of V-f with oxygen concentration: the temperature-dependent regime (TDR) and the negative-oxygendependent regime (NOR). The non-monotonic behavior of V-f against oxygen concentration for Cu can be explained by the controlling mechanism behind TDR and NOR. However, experimental results show one more regime above 31% oxygen concentration that cannot be explained by the theory proposed in this work, namely the soot-generation-dependent regime (SGR); here, radiation from the flame and soot deposit plays a dominant role in flame spread. (C) 2018 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
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