Survey of the acoustic near field of three nozzles at a pressure ratio of 30

One of 4,120 reports in the series: NACA Technical Notes available on this site.

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Description

The sound pressures radiating from the exhaust streams of two convergent-divergent and one convergent nozzle were measured. Exit diameters were 1.206 in. for the expanded nozzle and 0.625 in. for the convergent nozzle. The results are presented in a series of contour maps of overall and fine 1/3-octave-band sound pressures. The location of the source of the noise in each 1/3-octave band in the frequency range of 30 to 16,000 cps and the total power radiated were determined and compared with those of subsonic jets.

Physical Description

32 p. : ill.

Creation Information

Mull, Harold R. & Erickson, John C., Jr. April 1957.

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This report is part of the collection entitled: National Advisory Committee for Aeronautics Collection and one other and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 35 times . More information about this report can be viewed below.

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  • Main Title: Survey of the acoustic near field of three nozzles at a pressure ratio of 30
  • Series Title: NACA Technical Notes

Description

The sound pressures radiating from the exhaust streams of two convergent-divergent and one convergent nozzle were measured. Exit diameters were 1.206 in. for the expanded nozzle and 0.625 in. for the convergent nozzle. The results are presented in a series of contour maps of overall and fine 1/3-octave-band sound pressures. The location of the source of the noise in each 1/3-octave band in the frequency range of 30 to 16,000 cps and the total power radiated were determined and compared with those of subsonic jets.

Physical Description

32 p. : ill.

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  • Accession or Local Control No: 93R14015
  • URL: http://hdl.handle.net/2060/19930084725 External Link
  • Report No.: NACA-TN-3978
  • Center for AeroSpace Information Number: 19930084725
  • Archival Resource Key: ark:/67531/metadc56392

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National Advisory Committee for Aeronautics Collection

The National Advisory Committee for Aeronautics (NACA) was a U.S. federal agency founded on March 3, 1915 to undertake, promote, and institutionalize aeronautical research. On October 1, 1958 the agency was dissolved, and its assets and personnel transferred to the newly created National Aeronautics and Space Administration (NASA).

Technical Report Archive and Image Library

This selection of materials from the Technical Report Archive and Image Library (TRAIL) includes hard-to-find reports published by various government agencies. The technical publications contain reports, images, and technical descriptions of research performed for U.S. government agencies. Topics range from mining, desalination, and radiation to broader physics, biology, and chemistry studies. Some reports include maps, foldouts, blueprints, and other oversize materials.

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Creation Date

  • April 1957

Added to The UNT Digital Library

  • Nov. 17, 2011, 10:13 p.m.

Description Last Updated

  • April 5, 2018, 7:50 p.m.

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Mull, Harold R. & Erickson, John C., Jr. Survey of the acoustic near field of three nozzles at a pressure ratio of 30, report, April 1957; (digital.library.unt.edu/ark:/67531/metadc56392/: accessed May 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.