Since lean premixed combustion in gas turbine combustors undergoes in elevated pressure condition, it is important to know NO X formation characteristics under elevated pressure. Generally, effects of pressure on NO X formation characteristics are evaluated by using pressure coefficient on conventional systems. However, the value of pressure coefficient distributes widely from-0.2 to 0.5. This difference in the pressure coefficient stems from differences in experimental conditions and formation processes of NO X. As a result, effects of pressure on different NO X formation mechanisms have not been elucidated yet because of difficulties of temperature control of combustion region. In this study, to clarify the effects of pressure on the prompt NO X formation process is set as the objective. Experimental measurements and numerical simulation with detailed elementary reactions are conducted. The temperature controllable premixed flat flame burner is fabricated in the elevated pressure combustion chamber, and measurement of NO X concentration is conducted in the chamber. Both the experimental and numerical results clearly show that the pressure does not affect to the prompt NO X formation.

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