Interaction of a turbulent-jet noise source with transverse modes in a rectangular duct
George Peter Succi, Kenneth J. Baumeister, K. Uno Ingard, United States. National Aeronautics and Space Administration. Scientific and Technical Information Office
National Aeronautics and Space Administration, Scientific and Technical Information Office, 1978 - Transportation - 39 pages
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27-centimeter 5-kilohertz range acoustic response acoustic source acoustic spectra Anemometer asymmetric pressure spikes asymmetric singularities pressure axially oriented butterfly valve cutoff mode decay decibels detected diameter orifice downstream duct axis duct coordinate duct cross section duct modes duct response duct walls effects of jet eigenfrequencies Elapsed entering the duct equation excitation experiments exponential horn flow-duct free space frequency range higher order modes increases Institute of Technology kilohertz Lewis Research Center long tube Low-frequency spectra Mach number mass flow rate Massachusetts Institute measured microphone location mode cutoff frequency mode shape muffler NASA number of modes number of propagating Orifice diameter orifice plate oscillation pipe pressure response pressure spectrum propagating modes quency radiation radiative resistance range of jet rectangular duct shown in figure singularities pressure spikes sound pressure level source in free spectrum analyzer test section theory TRANSVERSE MODES transverse wave turbulent jet upstream