Abstract
Three configurations of six-bladed, 400-mm-diam, scale-model advanced propellers such as backward-, forward-, and back-forward alternately installed swept blades were tested in anechoic environments with an incoming main flow velocity up to 68 m/s. The data for the advance ratio of 0.43-1.15 were obtained in the aeroacoustic aspects. The arrangement of alternately swept blades showed the best quality among the three configurations in the spanwise circulation distribution. The forward-swept blades did not exhibit any aeroacoustic advantage. The alternately swept configuration as a tandem rotation has the potential for decreasing the sound levels at the blade passage frequencies by the dispersion of sound with neither any sacrifice of aerodynamic performance nor mechanical complexity. Nomenclature C = coefficient D = propeller diameter / = advance ratio N — rotational speed T = thrust U = rotational velocity U0 = main flow velocity V = flow velocity (3 = pitch angle 77 = efficiency 0 = ratio of ambient to standard temperature p = density Subscripts C = correction T = thrust P = power 0 = tangential 0 = reference
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