Fire Dynamics Simulation of a Turbulent Buoyant Flame Using a Mixure-Fraction-Based Combustion Model.
Fire Dynamics Simulation of a Turbulent Buoyant Flame
Using a Mixure-Fraction-Based Combustion Model.
Xin, Y.; Gore, J. P.; McGrattan, K. B.; Rehm, R. G.;
Baum, H. R.
Combustion and Flame, Vol. 141, No. 4, 329-335, June
Sponsor:National Institute of Standards and Technology,
fire dynamics; turbulent flames; combustion models;
simulation; equations; flame structures; flow fields
Fire dynamics simulations of a 7.1-cm buoyant turbulent
diffusion flame were performed using a
mixture-fraction-based combustion model. In our previous
work, good agreement between the measured and the
calculated fire flow field was achieved with carefully
selected domain and grid sizes using a Lagrangian
thermal-element combustion model. The Lagrangian
thermal-element model exhibits qualitative as well as
quantitative differences in the measured and calculated
temperature profiles in the flame zone. The number of
Lagrangian thermal elements must be carefully selected
and the model is not designed to provide insights into
the species distributions in the fire. To address these
issues, a mixture-fraction-based combustion model was
used in the present work. The domain and grid size
dependence using this model are documented. Comparisons
between the measured and the calculated velocities,
mixture fractions and temperatures show that the
mixture-fraction-based combustion model captures the
qualitative and quantitative fire behavior very well.