Full-Scale Investigation of Several Jet-Engine Noise-Reduction Nozzles

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Description

A number of nozzles which use the mixing interference of adjacent jets for noise suppression were investigated. Reductions in sound power of nearly 70 percent (5 db) with thrust losses of 1 percent were achieved. A method of calculating the limiting frequency affected by this type of suppression nozzle, that is , multiple-slot nozzles, is presented. Data are shown which indicate that further large reductions in sound power are not likely with mixing-interference nozzles.

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45 p. : ill.

Creation Information

Coles, Willard D. & Callaghan, Edmund E. 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 162 times . More information about this report can be viewed below.

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  • Main Title: Full-Scale Investigation of Several Jet-Engine Noise-Reduction Nozzles
  • Series Title: NACA Technical Notes

Description

A number of nozzles which use the mixing interference of adjacent jets for noise suppression were investigated. Reductions in sound power of nearly 70 percent (5 db) with thrust losses of 1 percent were achieved. A method of calculating the limiting frequency affected by this type of suppression nozzle, that is , multiple-slot nozzles, is presented. Data are shown which indicate that further large reductions in sound power are not likely with mixing-interference nozzles.

Physical Description

45 p. : ill.

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  • Accession or Local Control No: 93R13994
  • URL: http://hdl.handle.net/2060/19930084704 External Link
  • Report No.: NACA-TN-3974
  • Center for AeroSpace Information Number: 19930084704
  • Archival Resource Key: ark:/67531/metadc56345

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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

  • Nov. 13, 2018, 4:54 p.m.

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Coles, Willard D. & Callaghan, Edmund E. Full-Scale Investigation of Several Jet-Engine Noise-Reduction Nozzles, report, April 1957; (https://digital.library.unt.edu/ark:/67531/metadc56345/: accessed May 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.