Development of a Catalytic Combustor for Aircraft Gas Turbine Engines.
Abstract
The pollution problems associated with unburned hydrocarbons and carbon monoxide in the idle mode, and NOx and smoke production in the power mode of aircraft gas turbine operation can be minimized using hybrid catalytic combustion. A hybrid catalytic combustor consists of a fuel-rich precombustor, secondary air quenching zone, and monolithic catalyst stage which rapidly oxidizes CO and UHC produced in the pre-combustor. The concentration of thermally-produced NOx in the pre-combustor is very low because of the lack of oxygen. However, the formation of NOx precursors such as HCN and NH3 produced under fuel rich conditions must be considered. Data showed that nitrogeneous species produced in the rich pre-combustion zone were efficiently converted to NOx by catalysts under the very lean mixture conditions that result from the secondary air quench. The equivalence ratio in the pre-combustor was varied from 0.5 to 1.5, while the overall mixture, after secondary air injection, was in the range of 0.1 to 0.3.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 22, 1976
- Accession Number
- ADA040135
Entities
People
- Henry Shaw
- Vincent J. Siminski