Development of Staging Type Fuel Nozzle for Aero Engine

摘要

Research of combustion technologies to reduce NO{sub}x emission level of aero engines to 20% of ICAO CAEP4 is progressing in JAXA TechCLEAN Project. To realize such low NO{sub}x level, it is necessary to use not traditional combustion system but advanced one such as premixed combustion. Many research projects of the premixed combustion have been conducted for many years. But it is not in practical use yet, because it has many problems, such as low ignition performance, flashback, auto-ignition and combustion oscillation. We contrived a new fuel nozzle concept aiming at high ignition performance. First we made an ignition test of the fuel nozzle and it is confirmed that the fuel nozzle offers high ignition performance. And we tested it in the conditions up to pressure of 800 kPa. From the combustion test results, it is understood that the fuel nozzle has possibility to realize low NO{sub}x emission level, but it has not reached the target that is 20% of ICAO CAEP4.