There is a broad need to develop technologies that reduce criteria pollutants, namely oxides of nitrogen, unburned hydrocarbons, carbon monoxide and smoke from aircraft propulsion engines. The Single Annular ComBustor for Emissions Reduction (SABER) technology has been developed and introduced into the Honeywell HTF700 0 family of engines in order to provide significant reduction in these criteria pollutants. This article focuses on the combustor technology and processes that are utilized to reduce the pollutants with particular emphasis on abating oxides of nitrogen (NOx). The article describes the HTF7000 turbofan engine, the requirements and challenges for small engines, and the selected strategy of Rich-Quench-Lean combustion. Analytical and Experimental results are presented for the current generation of Honeywell combustion systems, the Single Annular comBustor for Emissions Reduction (SABER). The analytical results match well to the experimental results, and SABER has demonstrated more than 2 7% margin to the CAEP/6 NOx emissions standard, while also meeting significant margins in the other criteria pollutants. change is partially or largely due to anthropogenic (i.e. from people) causes. There is also growing awareness of local and regional pollution, especially near airports, which is putting pressure on mitigating source emissions. All aspects of power-generation, including aviation-related, are being challenged to reduce their contribution to both global and local environmental impact through regulatory as well as market-based measures. To date, the focus of these measures has been mainly on reducing Oxides of Nitrogen (NOx) emissions, while also maintaining low levels of carbon monoxide (CO) and Unburned Hydrocarbons (UHC's). This article focuses on the challenges, technologies and processes that have been utilized to reduce the emissions in gas turbine aero-engines, specifically the HTF7000 turbofan engine family. The challenges of achieving low emissions in small engines is broadly considered as a backdrop for the design approach selected. The technical approach adopted by Honeywell and the prevailing strategy of Rich-Quench-Lean combustion is described. The analytical modeling approach focusing on Computational Fluid Dynamics is described to allow this component to be optimized. Finally, results are presented for the current generation of Honeywell combustion systems, the Single Annular comBustor for Emissions Reduction (SABER).
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