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5.0 Technology Assessment The TAPS II combustion system successfully demonstrated capability to meet the FAA CLEEN NOx emissions goal of 60% margin to CAEP/6. The TAPS II meets this goal at a higher pressure ratio (38 OPR) than what was specified in the CLEEN goals (30 OPR). Therefore the TAPS II also contributes to the FAA CLEEN fuel burn goal by enabling higher engine efficiencies due to the higher pressure ratio. The program also met the internal GE targets of cruise NOx < 9 g/Kg fuel burn and the design has been scaled to a narrow body application. PM measurements were not completed because the PM measurement method and standard had not been established during the TAPS II program. Specific technologies demonstrated during the TAPS II development included scaling the TAPS lean burn concept from a wide-body application (GEnx) to a narrow-body (LEAP), development and evaluation of an improved main mixer and pilot stage designs, improved durability combustion liners and better combustion dynamics test and modeling capability. The TAPS II technology completed full annular combustor and core engine test demonstrations. In addition to meeting the CLEEN NOx goal, CO, HC and smoke emissions were improved relative to the baseline combustor design and were well below CAEP/6 limits. Although PM measurements were not taken, the 0 smoke number measured for staged operation shows the potential for much lower PM emissions with a lean burn TAPS II system. A PM limit has not been established by ICAO, but the staged lean burn smoke number has > 90% margin to the smoke number limit which meets the program goal. Rich burn pilot only smoke had 80% margin to the ICAO limit. The design demonstrated acceptable lean blowout and altitude relight. Exit temperature profile and pattern factor met requirements. High frequency combustion dynamics were present but the fuel and control system has the ability to avoid them. Combustor pressure loss and turbine backflow margin met requirements. Metal temperatures were at acceptable levels. 5.1 Technology Readiness Level The goal of the CLEEN program was to develop the TAPS II combustor to a technology readiness level of 6. TRL6 requires a systems level demonstration. A successful system demonstration was accomplished by the LEAP core engine test. Therefore, the TAPS II combustor with a dual orifice pilot is at TRL6. The TAPS II TRL was 2 at the beginning of the CLEEN program. Page 19PDF Image | TAPS II Combustor Final Report
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