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Noise Comparisons from FullScale Fan Tests
Sound Generation by Wake Cutting
Effects of Modulated Blade Spacing on Static Rotor Acoustics
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acoustic aeroacoustic aerodynamic aircraft airfoil airplane analysis angle Apollo 15 attached and separated axial blade passage frequency blown flap boundary layer broadband broadband noise calculated CENTER characteristics coefficient Comparison configuration contour correlation curves damping ratio density diameter direction duct effects engine equation experimental fan design fan noise flight flyover function harmonic increase indicate inlet jet noise laser lift linear Mach number maximum measured microphone mode modulation NASA noise levels nondimensional nonlinear nozzle OASPL obtained over-all overpressure panel parameters peak perceived noise pitot probe plane predicted pressure fluctuations pressure ratio probe radiation radiation pressure reduced region Research rotor noise sensors separated flow shock waves shown in Fig signal signature sonic boom sound power sound pressure level spectra spectrum splitters stator STOL subsonic supersonic suppression surface temperature theory tion tip speed tone Turbulent Boundary Layer values wind tunnel wing