Abstract
The eddy dissipation model has been used extensively in turbulent combustion modelling because of its simplicity, good convergence, and reasonable accuracy. The model constant A with the standard value 4 has been used in numerous CFD applications without verification and validation. A systematic investigation of the model constant A has been carried out here. Eleven turbulent diffusion flames including round jet flames and opposed jet flames are CFD simulated and the simulation results are compared with experimental data. It is revealed that the flame temperature predicted with A = 4 deviates from experimental data severely. An optimal A value can be found to match experimental data for each flame; this value depends on fuel, chemistry, and the turbulence strength of combustion flow field; it varies between 0.77 and 25 for the 11 flames. A correlation of optimal A value with turbulent Reynolds number is presented; a modification to the original eddy dissipation model is also presented and validated.
Published Version
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