For the advanced turboprop to be competitive with proposed advanced turbofan-powered aircraft, it must have high propulsive efficiency at Mach 0.8 cruise above 9.144-km altitude with an acceptable cabin noise environment. Four 8-bladed propeller models are designed employing various concepts to reduce compressibility losses. Wind tunnel tests are conducted at zero model incidence to the free-stream flow. Aerodynamic and acoustic test results are presented and discussed. It is shown that the aeroacoustically designed configuration (SR-3) with 45 deg of tip sweep and an area-ruled spinner yields the highest propulsive efficiency (78.7% at Mach 0.8, 3.06 advance ratio, and 1.7 power coefficient), with an improvement of about 3% over the straight bladed configuration (SR-2, with zero-degree sweep). The phase-interference concept for noise reduction used in SR-3 yields about 5-6 dB reduction as compared to SR-2.
Wind tunnel performance of four energy efficient propellers designed for Mach 0.8 cruise
Society of Automotive Engineers, Business Aircraft Meeting and Exposition ; 1979 ; Wichita, KS
1979-04-01
Conference paper
No indication
English
Wind Tunnel Performance of Four Energy Efficient Propellers Designed for Mach 0.8 Cruise
SAE Technical Papers | 1979
|