DESIGN AND PERFORMANCE OF ENERGY EFFICIENT PROPELLERS FOR MACH 0.8 CRUISE
The increased emphasis on fuel conservation in the world has stimulated a series of studies of both conventional and unconventional propulsion systems for commercial aircraft. Preliminary results from these studies indicate that a fuel saving of 14 to 40 percent may be realized by the use of an advanced high-speed turboprop. This turboprop must be capable of high efficiency at Mach 0.8 cruise above 9.144 km altitude if it is to compete with turbofan powered commercial aircraft. Several advanced aerodynamic concepts were investigated in recent wind tunnel tests under NASA sponsorship on two propeller models. These concepts included aerodynamically integrated propeller/nacelles, area ruling, blade sweep, reduced blade thickness and power (disk) loadings several times higher than conventional designs. The aerodynamic design methodology for these models is discussed. In addition, some of the preliminary test results are presented which indicate that propeller net efficiencies near 80 percent were obtained for high disk loading propellers operating at Mach 0.8.
- Conf-Presented at the 1977 Natl. Business Aircraft Meeting and Exposition, Wichita, Kas. 29 Mar. - 1 Apr. 1977; Sponsored by Sae Century 2.
Department of the NavyThe Pentagon
Washington, DC USA 20350
- Mikkelson, D C
- Blaha, B J
- Mitchell, G A
- Wikete, J E
- Publication Date: 1977
- Pagination: 32 p.
- TRT Terms: Aerodynamics; Civil aviation; Energy conservation; Fuel consumption; Mach number; Nacelles; Propellers; Structural design; Turbofan engines; Turboprop engines; Wind tunnels
- Old TRIS Terms: Propeller efficiency; Structural design criteria
- Subject Areas: Aviation; Energy; Environment; Vehicles and Equipment;
- Accession Number: 00159198
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: NASA-TM-X-73612, E-9095
- Files: TRIS
- Created Date: Aug 31 1978 12:00AM