A SEMIANALYTICAL EMISSION MODEL FOR DIFFUSION FLAME, RICH LEAN AND PREMIXED LEAN COMBUSTORS/

To enhance gas turbine combustor performance and emissions characteris tics, better design methods need to be developed. In the present inves tigation, an emission model that simulates a detailed chemical kinetic scheme has been developed to provide the rate of reactions of the par ent fuel all intermediate hydrocarbon compound, Co, and H-2. The inter mediate fuel has variable carbon and hydrogen contents depending on de pending on operating conditions, that were selected in tire developmen t effort to stimulate actual operation of rich/lean, diffusion flame, and lean combustor concepts The developed reaction rate expressions ad dress also tile limited reaction rates that may occur in the near-wall regions of the combustor due to die admittance of radial hardtops and cooling air in these regions. The validation effort included the appl ication of the developed model to a combustor simulated by a multiple- reactor arrangement. The results indicate the accurate duplication of the calculations obtained from the detailed kinetic scheme using the d eveloped model. This illustrates dir great potential of using such a u nified approach to guide the design of various types of combustor to m eet the more stringent emissions and performance requirements of next- generation gas turbine engines.