title: Emission Reduction of Fuel-Staged Aircraft Engine Combustor Using an Additional Premixed Fuel Nozzle.
abstract: 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 NOxthreshold 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 NOxstandard. 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 NOxemissions relative to the ICAO CAEP/4 standard and a drastic reduction in smoke and CO emissions.
authors: e-mail:  yamamoto.takeshi@jaxa.jp.
authors: Takeshi
authors: T
authors: Yamamoto
authors: Kazuo
authors: K
authors: Shimodaira
authors: Seiji
authors: S
authors: Yoshida
authors: Clean Engine Team , Aviation Program Group, Japan Aerospace Exploration Agency, 7-44-1 Jindaiji-higashi-machi, Chofu , Tokyo 182-8522, Japan.
authors: Yoji
authors: Y
authors: Kurosawa