An empirical method for predicting the mixing noise levels of subsonic circular and coaxial jets
James W. Russell, Langley Research Center, United States. National Aeronautics and Space Administration. Scientific and Technical Information Office
National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1984 - Transportation - 119 pages
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150 degrees 2.828 Velocity Rati angle coordinate points circular and coaxial circular jet tests coaxial jet tests cubic spline curve fitted DATA SETS dB dB dB defined derivative multiplier derivative values directivity angle coordinate directivity index Equivalent Total Temperature Figure flow state parameters frequency parameter coordinate inner stream jet flow Jet noise test jet total temperature jet velocity l-H l-H mass flow Mass flow rate NASA NGTE Set noise level coordinates noise test points Normalized Equivalent Total Normalized Equivalent Velocity normalized frequency parameter normalized power spectrum Nozzle exit flow OAPWL OATA obtained in Step octave band power one-third octave band outer stream overall power level parameter coordinate points power spectrum level Prediction method comparison primary jet relative spectrum level secondary jet SNECMA sound pressure level specific heat ratio spectra speed of sound standard error subsonic Table Taylor series Te/t Ve/c Zorumski and Weir