Prediction of flyover jet noise spectra from static tests
Ulf Michel, Alfons Michalke (Dr.-Ing.), Langley Research Center, United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch
U.S. National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1981 - Technology & Engineering - 24 pages
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According to equation Aerotrain contracted coordinate system corresponding scaling laws cross spectral density DENSITY OF JET double integral emission angle 0O equa equation 43 equations 55 equivalent static jet experimental results exponential term far-field jet noise Figure fixed with respect flight Mach number flyover coordinates flyover jet noise flyover noise frequency f frequency shift hot jets influence of flight jet axis jet noise ref jet turbulence Langley Research Center laws for one-third-octave mean square values Mf cos 0O NLR wind tunnel noise in flight overall sound pressure peak frequency Poao2 power law power spectral density Prediction Relative one-third-octave spectra Reynolds stress sound intensity SOUND POWER LEVEL sound pressure level source cross spectral source function source point source quantities source term specific thrust spectra of jet spectra of static static and flyover stretching parameter Strouhal number Nc tunnel flight simulation Ue/aQ Uf-dependence wave normal distance wind tunnel coordinates wind tunnel flight