Supersonic jet noise generated by large-scale instabilities
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Supersonic jet noise generated by large-scale instabilities by John M Seiner

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Published by National Aeronautics and Space Administration, Scientific and Technical Information Branch, For sale by the National Technical Information Service] in Washington, D.C, [Springfield, Va .
Written in English

Subjects:

  • Jet planes -- Noise,
  • Supersonic planes -- Noise

Book details:

Edition Notes

StatementJohn M. Seiner, Dennis K. McLaughlin, C.H. Liu
SeriesNASA technical paper -- 2072
ContributionsMcLaughlin, Dennis K, Liu, C. H. 1941-, United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch
The Physical Object
Pagination42 p. :
Number of Pages42
ID Numbers
Open LibraryOL14933226M

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Supersonic jet noise generated by large-scale instabilities. Washington, D.C.: National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [Springfield, Va.: For sale by the National Technical Information Service],   Noise power spectrum of a nearly ideally expanded supersonic jet. of low Reynolds number supersonic jets the experiments of McLaughlin, Morrison and Troutt [14] have shown this part of the noise to be generated by large scale flow :// Supersonic jet noise generated by large scale instabilities. By D. K. Mclaughlin, J. M. Seiner and C. H. Liu. Abstract. The role of large scale wavelike structures as the major mechanism for supersonic jet noise emission is examined. With the use of aerodynamic and acoustic data for low Reynolds number, supersonic jets at and below 70 thousand   The role of large scale wavelike structures as the major mechanism for supersonic jet noise emission is examined. With the use of aerodynamic and acoustic data for low Reynolds number, supersonic jets at and below 70 thousand comparisons are made with flow fluctuation and acoustic measurements in high Reynolds number, supersonic jets. These comparisons

Mclaughlin, D. K., Seiner, J. M. & Liu, H. On the noise generated by large scale instabilities in supersonic jets. AIAA Paper 80 – Tam, C. K. W. Directional acoustic radiation from a supersonic jet generated by shear layer instability J. Fluid Mech. 46, – The effects of jet temperature on acoustic waves generated by a supersonic jet are investigated using large eddy simulation (LES) based on a high-fidelity computational code. scale jet-noise   The main cause of acoustic noise from high-speed turbulent jets is hydrodynamic instability. Depending on the scale, frequency, area of occurrence of these instabilities and their structures it is possible to classify such parameters of a supersonic jet noise source as radiation direction, intensity, spectrum frequency [1, 2].The following noise sources are allocated for free supersonic   An experimental investigation of noise generation by instabilities in low Reynolds number supersonic air jets has been performed. Sound pressure levels, spectra and acoustic phase fronts were measured with a traversing condenser microphone in the acoustic field of axisymmetric, perfectly expanded, cold jets of Mach numbers 14, 21 and 2://

  The role of large-scale vortex in a turbulent jet noise. ON THE NOISE GENERATED BY LARGE SCALE INSTABILITIES IN SUPERSONIC JETS. Jin-Hwa Kim and Mo Samimy; 45th AIAA Aerospace Sciences Meeting and Exhibit June Noise produced by the large-scale transition region structure of turbulent ://   Supersonic jet noise is generated by mechanisms associated with fine-scale turbulence, large-scale tur-bulent structures and shocks. Depending on the jet operating conditions and the structure of the ex-hausting flow field, each of these noise generating "Research Scientist, member AIAA tSenior Research Associate, member AIAA   Since both subsonic and supersonic jet exit conditions are examined, it is argued that the noise radiation in the peak radiation directions is controlled by the axial evolution of the turbulent large scale structures and is not associated with a combination of source convection and mean flow refraction :// Jet noise generated by large-scale coherent motion, in: H. Hubbard (Ed.), Aeroacoustics of flight vehicles: Theory and practice, (). Measurements of mean static pressure and far-field acoustics of shock-containing supersonic jets,