Calculations of turbulent mass transport in a bluffbody diffusionflame combustor
Abstract
Experimental measurements of turbulent mass transit in a bluffbody diffusionflame combustor (using CO2 instead of fuel) are analyzed to evaluate the accuracy of physical models used in flow computations. The data of Lightman and Magill (1981), Lightman et al. (1983), and Roquemore et al. (1983) are used to calculate apparent turbulent Schmidt numbers (TSN) for a series of flow conditions by a modified TEACH viscousflow code. The modeling principles, calculation grid, and boundary conditions are discussed, and the results are presented in graphs comparing calculated and measured values. It is shown that models such as the twoequation (K  epsilon) model which use a single value of the TSN are inappropriate for conditions typical of gasturbine combustors: local TSN variations due to turbulence behavior must be taken into account in improved models.
 Publication:

AIAA, Aerospace Sciences Meeting
 Pub Date:
 January 1984
 Bibcode:
 1984aiaa.meetZ....S
 Keywords:

 Bluff Bodies;
 Combustion Chambers;
 Diffusion Flames;
 Gas Turbine Engines;
 Mass Transfer;
 Turbulent Flow;
 Carbon Dioxide;
 Computational Fluid Dynamics;
 KEpsilon Turbulence Model;
 Schmidt Number;
 Fluid Mechanics and Heat Transfer