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acoustic acoustic data aerodynamic AIAA AIAA PAPER aircraft airfoil amplitude analysis anechoic chamber angle approximately axial blade passing frequency blade row blown flap boundary layer broadband noise chord component configuration convection correlation cross-correlation diameter direction distribution downstream duct effect engine enthalpy equation experimental fan noise flight forward speed FT/SEC function harmonic helicopter helicopter rotor increase inlet interaction noise jet axis jet flow jet noise jet velocity lift force m/sec Mach number Mach waves measured microphone modes NASA noise levels noise source nozzle nozzle exit OASPL obtained parameters peak plane prediction propagation radiation ratio relative rotational rotor blades rotor noise shadowgraphs shear layer shown in Figure signal sound pressure level spectra spectrum static stator blades Strouhal number strut subsonic surface theoretical theory tion tip speed tone levels trailing edge tunnel turbofan turbulence unsteady upstream vortex vortex ring vortices wing