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Effect of Water Vapor on Counterflow Diffusion Flames.

pdf icon Effect of Water Vapor on Counterflow Diffusion Flames. (462 K)
Suh, J.; Atreya, A.

National Institute of Standards and Technology (NIST) and Society of Fire Protection Engineers (SFPE). International Conference on Fire Research and Engineering (ICFRE). Proceedings. September 10-15, 1995, Orlando, FL, SFPE, Boston, MA, Lund, D. P.; Angell, E. A., Editor(s)(s), 103-108 pp, 1995.


National Institute of Standards and Technology, Gaithersburg, MD


fire research; diffusion flames; water vapor; flame temperature; temperature measurements; equations; flame structure; temperature profiles; hydroxyl radicals


The chemical and physical effect of water vapor on the structure of counterflow diffusion flames is investigated both experimentally and theoretically. The experimental flame structure measurements consist of profiles of temperature, stable gases and hydrocarbons, soot and OH radical concentrations and spatially resolved radiative emission measurements. These experimental measurements are compared with numerical calculations with detailed C2 chemistry. For these computations, experimentally measured temperature profiles were used instead of the energy equation to more accurately describe the flame radiative heat losses. The flame structure results show that as the water vapor concentration is increased, the OH radical concentration increases. This increases the flame temperature and the CO2 production rate and decreases the CO production rate. However, after approximately 30% water vapor substitution, the chemical enhancement by water vapor is not observed and the flame temperature begins to decrease.