Abstract
A two-step global model describing the combustion of hydrogen in air at 1 atm pressure is developed by comparing the temperature histories obtained from a 28 reaction H-O mechanism. Using criteria discussed herein, good agreement is obtained in the range of initial mixture temperatures of 1000-2000 K and in the range of equivalence ratios of 0.2-2.0. The two-step global model is compared with the results obtained using an eightstep, H-O reaction mechanism in a computer program describing the turbulent diffusion of hydrogen in supersonic axisymmetric and two-dimensional reacting flows. Comparisons of profiles of temperature and pitot pressure are presented. The global model is judged to be adequate in flows which are not dominated by long ignition delay times.
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