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.


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    Titel :

    Wind tunnel performance of four energy efficient propellers designed for Mach 0.8 cruise


    Beteiligte:
    Jeracki, R. J. (Autor:in) / Mikkelson, D. C. (Autor:in) / Blaha, B. J. (Autor:in)

    Kongress:

    Society of Automotive Engineers, Business Aircraft Meeting and Exposition ; 1979 ; Wichita, KS


    Erscheinungsdatum :

    1979-04-01


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Keine Angabe


    Sprache :

    Englisch




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    Blaha, Bernard J. / Mikkelson, Daniel C. / Jeracki, Robert J. | SAE Technical Papers | 1979


    Design and Performance of Energy Efficient Propellers for Mach 0.8 Cruise

    D. C. Mikkelson / B. J. Blaha / G. A. Mitchell et al. | NTIS | 1977


    Design and performance of energy efficient propellers for Mach 0.8 cruise

    Mikkelson, D. C. / Blaha, B. J. / Mitchell, G. A. et al. | NTRS | 1977


    Design and performance of energy efficient propellers for Mach 0.8 cruise

    Mikkelson, D. C. / Blaha, B. J. / Mitchell, G. A. et al. | NTRS | 1977