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Wind tunnel performance of four energy efficient propellers designed for Mach 0.8 cruiseFor 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.
Document ID
19790052746
Document Type
Conference Paper
Authors
Jeracki, R. J. (NASA Lewis Research Center Cleveland, OH, United States)
Mikkelson, D. C. (NASA Lewis Research Center Cleveland, OH, United States)
Blaha, B. J. (NASA Lewis Research Center Cleveland, Ohio, United States)
Date Acquired
August 9, 2013
Publication Date
April 1, 1979
Subject Category
AIRCRAFT PROPULSION AND POWER
Report/Patent Number
SAE PAPER 790573
Meeting Information
Society of Automotive Engineers, Business Aircraft Meeting and Exposition(Wichita, KS)
Distribution Limits
Public
Copyright
Other