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Structure and Suppression of Nonpremixed Counterflow Flames  

Anthony Hamins (National Institute of Standards and Technology)
Park, Woe-Chul (National Institute of Standards and Technology)
Publication Information
Fire Science and Engineering / v.17, no.3, 2003 , pp. 20-25 More about this Journal
Abstract
Measurements with filaments and thermocouples and computations with Oppdif and FDS were carried out to investigate the impact of flame strain, agent addition, and buoyancy on the structure and extinction of nonpremixed counterflow flames. Measurements through 2.2 s drop tests in microgravity conditions and experiments in normal gravity conditions were compared with the results of computations. For the global strain rates 7 s$^{-1}$ through 100 s$^{-1}$ , the turning point behavior in the critical nitrogen concentration at O-g was confirmed. The effects of buoyancy, that is, changes in the flame curvature and thickness were also confirmed by the computations with FDS. There was agreement in the peak flame temperature and its position between the computations and the measurements in the near extinction methane/air diffusion flames in microgravity.
Keywords
Methane-air counterflow flame; Flame structure and suppression; Microgravity; Experiments; Computations; Extinction concentration;
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  • Reference
1 K. Maruta, M. Yoshida, H. Guo, Y. Ju, and T. Niioka, 'Extinction of Low Stretched Diffusion Flame in Microgravity', Combust. Flame, Vol. 112, pp.181-187(1998)   DOI   ScienceOn
2 A. Lutz, R. J. Kee, J. Grcar, and E M. Rupley, Fortran Program Computing Opposed Flow Diffusion Flames, SAND96-8243, Sandia National Labs, Livermore(1997)
3 K. B. McGrattan, H. R. Baum, R. G. Rehm, A. Hamins, G. P. Forney, J. E. Floyd, and S. Hostikka, Fire Dynamics Simulator Technical Reference Guide, National Institute of Standards and Technology, Gaithersburg, MD(2002)
4 M. Bundy, A. Hamins, and K. Y. Lee, 'Suppression Limits of Low Strain Rate Non Premixed Methane Flames', Combust. Flame, Vol. 133, No.3, pp.299 -310(2003)   DOI   ScienceOn
5 C. T. Bowman, R. K. Hanson, D. E Davidson, W. C. Gardiner, V. Lissianski, G. P Smith, D. M. Golden, M. Frenklach, and M. Goldenberg, GRIMECH 2.11, URL:http://www.me.berkeley.edu/grimech/1995)
6 W. L. Grosshandler, RADCAL: NIST Technical Note 1402, National Institute of Standards and Technology, Gaithersburg, MD(1993)