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1685287 
Journal Article 
Conditional moment closure and transient flamelet modelling for detailed structure and NOx formation characteristics of turbulent nonpremixed jet and recirculating flames 
Kim, G; Kang, S; Kim, Y; Bilger, RW; Cleary, MJ 
2007 
Yes 
Combustion Theory and Modelling
ISSN: 1364-7830 
11 
4 
527-552 
WOS:000248751600002 
This study has been mainly motivated to assess computationally and theoretically the conditional moment closure ( CMC) model and the transient flamelet model for the simulation of turbulent non-premixed flames. These two turbulent combustion models are implemented into the unstructured grid finite volume method that efficiently handles physically and geometrically complex turbulent reacting flows. Moreover, the parallel algorithm has been implemented to improve computational efficiency as well as to reduce the memory load of the CMC procedure. Example cases include two turbulent CO/ H-2/ N-2 jet flames having different flow timescales and the turbulent nonpremixed H-2/CO flame stabilized on an axisymmetric bluff- body burner. The Lagrangian flamelet model and the simplified CMC formulation are applied to the strongly parabolic jet flame calculation. On the other hand, the Eulerian particle flamelet model and full conservative CMC formulation are employed for the bluff-body flame with flow recirculation. Based on the numerical results, a detailed discussion is given for the comparative performances of the two combustion models in terms of the flame structure and NOx formation characteristics. 
turbulent nonpremixed flames; conditional moment closure; transient flamelet model; unstructured grid