Analytical Investigation of Fan Tone Noise Due to Ingested Atmospheric TurbulenceNational Aeronautics and Space Administration, Scientific and Technical Information Branch, 1980 - Air ducts - 144 pages |
Contents
Effect of Flow Contraction on Standard Deviation of Turbulence | 33 |
17 | 39 |
22 | 46 |
2 other sections not shown
Common terms and phrases
altitude amax Amnk angle of attack Approach flight approach power atmospheric boundary layer atmospheric turbulence attack effects blade passing frequency contraction ratios convected convected turbulence distortion elements duct radii due to atmospheric due to convected engine equations exponents fan duct fan rotor fan tone noise flight conditions flow contraction Function of Transverse Gaussian eddy harmonics inlet angle integral length scales isotropic JT9D mean square mode Number of rotor Poisson distributed predicted radial order reference condition represent rotor tone noise scale distribution Section shown in Figure sound power levels sound pressure field sound pressure levels spectra spectrum square mode amplitude standard deviations static and flight static conditions static pressure streamtube streamwise turbulence component test stand tip Mach number tone noise due transducers Transverse integral scale transverse scales transverse turbulence component turbulence field turbulence intensities turbulence involved turbulence model turbulence variance vortex field vortices wavenumber ZREF