ANALYTICAL EVALUATION OF THE IMPACT OF BROAD SPECIFICATION FUELS ON HIGH BYPASS TURBOFAN ENGINE COMBUSTORS
The impact of the use of broad specification fuels on the design, performance durability, emissions and operational characteristics of combustors for commercial aircraft gas turbine engines was assessed. Single stage, vorbix and lean premixed prevaporized combustors, in the JT9D and an advanced energy efficient engine cycle were evaluated when operating on Jet A and ERBS (Experimental Referee Broad Specification) fuels. Design modifications, based on criteria evolved from a literature survey, were introduced and their effectiveness at offsetting projected deficiencies resulting from the use of ERBS was estimated. The results indicate that the use of a broad specification fuel such as ERBS, will necessitate significant technology improvements and redesign if deteriorated performance, durability and emissions are to be avoided. Higher radiant heat loads are projected to seriously compromise liner life while the reduced thermal stability of ERBS will require revisions to the engine-airframe fuel system to reduce the thermal stress on the fuel. Smoke and emissions output are projected to increase with the use of broad specification fuels. While the basic geometry of the single stage and vorbix combustors are compatible with the use of ERBS, extensive redesign of the front end of the lean premixed prevaporized burner will be required to achieve satisfactory operation and optimum emissions.
Pratt and Whitney AircraftCommercial Products Division, 400 Main Street
East Hartford, CT United States 06118
- Lohmann, R P
- Szetela, E J
- Vranos, A
- Publication Date: 1978-12
- Pagination: 161 p.
- TRT Terms: Aircraft fuels; Civil aircraft; Combustion; Combustion chambers; Combustion efficiency; Engines; Fuel conservation; Gas turbines; Jet engine fuels; Technology assessment; Turbine engines; Turbofan engines; Vehicle design
- Old TRIS Terms: Broad specification fuels; Combustion properties; Combustion temperature; Engine design; High bypass turbofan engines; Pratt and whitney jt9d engine
- Subject Areas: Aviation; Design; Energy; Vehicles and Equipment;
- Accession Number: 00191210
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: NASA-CR-159454 Final Rpt.
- Contract Numbers: NAS3-20802
- Files: TRIS
- Created Date: May 11 1979 12:00AM