Abstract
In view of safety assessment of containment integrity in nuclear power plants, the structures and burning velocity characteristics of hydrogen/air/steam premixed flames have been analyzed numerically using a detailed chemical mechanism with 19 elementary steps concerning H2/O2 reactions. Time integration and the modified Newton method are applied in solving the governing equations and an adaptive grid method is employed to resolve the stiffness.
Burning velocities are obtained as a function of hydrogen mole fraction, steam mole fraction, and initial temperature. The effect of carbon monoxide addition on burning velocities are also considered. The calculated burning velocities are generally lower than the existing experimental values. However, they show good qualitative agreement irrespective of the reaction mechanisms used in the computation. Steam is found to have both cooling effect and chemical effect affecting chain-branching reaction and heat release. A correlation on burning velocities is obtained and can be used as an improved relation over a wide range of steam concentration.
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Sohn, C.H., Aum, Y.G., Chung, S.H. et al. A burning velocity correlation for premixed hydrogen/air/steam flames. KSME International Journal 13, 294–303 (1999). https://doi.org/10.1007/BF02970488
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DOI: https://doi.org/10.1007/BF02970488