Combustion-zone stoichiometry and fuel-air premixing were actively controlled to optimize the combustor performance over a range of operating conditions. The objective was to maximize the combustion temperature, while maintaining NOx within a specified limit. The combustion system consisted of a premixer located coaxially near the inlet of a water-cooled shroud. The equivalence ratio was controlled by a variable-speed suction fan located downstream. The split between the premixing air and diffusion air was governed by the distance between the premixer and shroud. The combustor performance was characterized by a cost function evaluated from time-averaged measurements of NOx and oxygen concentrations in products. The cost function was minimized by the downhill simplex algorithm employing closed-loop feedback. Experiments were conducted at different fuel flow rates to demonstrate that the controller optimized the performance without prior knowledge of the combustor behavior.
- International Gas Turbine Institute
Active Control of Combustion for Optimal Performance
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Jackson, MD, & Agrawal, AK. "Active Control of Combustion for Optimal Performance." Proceedings of the ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition. Volume 3: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations. Stockholm, Sweden. June 2–5, 1998. V003T06A055. ASME. https://doi.org/10.1115/98-GT-576
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