Emission Reduction of Fuel-Staged Aircraft Engine Combustor Using an Additional Premixed Fuel Nozzle

• Published in: Journal of engineering for gas turbines and power Vol. 135; no. 3; p. 0315021
• Main Authors: Yamamoto, Takeshi, Shimodaira, Kazuo, Yoshida, Seiji, Kurosawa, Yoji
• Format: Journal Article
• Language: English
• Published: United States 01.03.2013
• DOI: 10.1115/1.4007868
• ISSN: 0742-4795

The Japan Aerospace Exploration Agency (JAXA) is conducting research and development on aircraft engine technologies to reduce environmental impact for the Technology Development Project for Clean Engines (TechCLEAN). As a part of the project, combustion technologies have been developed with an aggressive target that is an 80% reduction over the NO threshold of the International Civil Aviation Organization (ICAO) Committee on Aviation Environmental Protection (CAEP)/4 standard. A staged fuel nozzle with a pilot mixer and a main mixer was developed and tested using a single-sector combustor under the target engine's landing and takeoff (LTO) cycle conditions with a rated output of 40 kN and an overall pressure ratio of 25.8. The test results showed a 77% reduction over the CAEP/4 NO standard. However, the reduction in smoke at thrust conditions higher than the 30% MTO condition and of CO emission at thrust conditions lower than the 85% MTO condition are necessary. In the present study, an additional fuel burner was designed and tested with the staged fuel nozzle in a single-sector combustor to control emissions. The test results show that the combustor enables an 82% reduction in NO emissions relative to the ICAO CAEP/4 standard and a drastic reduction in smoke and CO emissions.