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aerodynamic aircraft airfoil altitude amplitude analysis anechoic chamber angle axial band blade Blade-Vortex Interaction Blown Flap boundary characteristics coaxial component configurations convection correlation cross-correlation curve density diameter direction downstream effect experimental experiments far-field Figure flap flight flow field fluctuations Fluid function harmonic helicopter helicopter rotors high frequency increase investigation isotach jet axis Jet Engine jet noise Lighthill linear Lowson Mach number measurements mechanism microphone mixing layer NASA noise measurements noise radiation noise source normal nozzle nozzle exit obtained overpressure parameters plane predicted propagation range ratio reduced Research reverberation chamber Ribner Rotor Noise scale shadowgraphic shear shown in Fig signal slot nozzle sonic boom sound field sound power sound pressure level sound speed spectra spectrum static pressure STOL subsonic supersonic jet flows surface theory tion turbulence unsteady V/STOL variables velocity vortex vorticity wave equation