Comparison of combustion models for industrial applications

摘要

Three models for simulating turbulent combustion in gas turbines operated in the lean-premixed mode were investigated. The models considered are Magnussens EDC formulation coupled with a two-step kinetics, a turbulent flame closure and a laminar flamelet ansatz, respectively. Validation was carried out against an extensive set of experimental data for a low-NO_x gas turbine burner operated at atmospheric pressure. Full-load conditions and two part-load operation modes were considered. The results showed for all models a comparable level of agreement with experiment, but significant differences in ease of use, flexibility and computational requirements. Generally, good accuracy was achieved at full-load conditions, but agreement with the available experimental data rapidly deteriorated at part-load. From a computational point of view the TFC model is significantly more efficient and easier to implement than the other models. The main drawback of the laminar flamelet model is the need for an extensive library and larger computational requirements. None of the models predicted CO concentrations with satisfactory accuracy.