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Investigation of Effects of Shield Gas on Counterflow Flame Structure  

Park, Woe-Chul (Department of Safety Engineering, Pukyong National University)
Publication Information
Journal of the Korean Society of Safety / v.17, no.2, 2002 , pp. 112-117 More about this Journal
Abstract
The effects of shield gas on the structure of methane-air nonpremixed counterflow flames were numerically investigated. The near extinction flame of a low global strain rate 20 $s^{-1}$ of 19% methane diluted by 81% nitrogen by volume and undiluted air was computed. The flame shape, centerline temperature and axial velocity profiles were compared for different velocity of the shield gas and with and without the shield gas. The effects of the velocity of the shield gas were negligible for $V_{S}/V_{F}{\leq}2$ in normal gravity. Under normal gravity conditions, the flame shape and its position with the shield gas were different from those of the flame without the shield gas, whereas no discernible effects of the shield gas along the centerline were observed in zero gravity.
Keywords
numerical simulations; air-methane counterflow flame; shield gas; flame structure;
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Times Cited By KSCI : 1  (Citation Analysis)
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