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
234 | 12 |
14 | 35 |
Normalized Pre and PostContraction Spectra for the Streamwise | 41 |
2 other sections not shown
Other editions - View all
Analytical Investigation of Fan Tone Noise Due to Ingested Atmospheric ... Ulrich W. Ganz No preview available - 1980 |
Common terms and phrases
altitude amax Amnk angle of attack Approach flight approach power atmospheric boundary layer atmospheric turbulence blade passing frequency coefficients contraction ratios convected convected turbulence correlation distortion elements duct radii due to atmospheric due to convected engine equations exponents fan duct fan noise due fan rotor fan tone noise flight conditions flow contraction Function of Transverse harmonics Imax inlet angle integral length scales isotropic JT9D Number of rotor radial order radius reference condition rotor tone noise scale distribution Section shear stress shown in Figure Sound Power Level sound pressure field Sound Pressure Levels spectra standard deviations static and flight static conditions static pressure streamtube streamwise turbulence component surface roughness scale test stand tip Mach number tone noise due Transverse integral scale transverse scales transverse turbulence component turbulence field turbulence intensities turbulence model turbulence variance turbulent energy vortex field vortices wavenumber ZREF