Theoretical and experimental investigation of mufflers with comments on engine-exhaust muffler design

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Description

Equations are presented for the attenuation characteristics of single-chamber and multiple-chamber mufflers of both the expansion-chamber and resonator types, for tuned side-branch tubes, and for the combination of an expansion chamber with a resonator. Experimental curves of attenuation plotted against frequency are presented for 77 different mufflers with a reflection-free tailpipe termination. The experiments were made at room temperature without flow; the sound source was a loud-speaker. A method is given for including the tailpipe reflections in the calculations. Experimental attenuation curves are presented for four different muffler-tailpipe combinations, and the results are compared with the theory. The application of … continued below

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829 - 875 p. : ill.

Creation Information

Davis, Don D., Jr.; Stokes, George M.; Moore, Dewey & Stevens, George L., Jr. October 6, 1952.

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This report is part of the collection entitled: National Advisory Committee for Aeronautics Collection and was provided by the UNT Libraries Government Documents Department to the UNT Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 5189 times, with 29 in the last month. More information about this report can be viewed below.

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  • Main Title: Theoretical and experimental investigation of mufflers with comments on engine-exhaust muffler design
  • Series Title: NACA Technical Reports

Description

Equations are presented for the attenuation characteristics of single-chamber and multiple-chamber mufflers of both the expansion-chamber and resonator types, for tuned side-branch tubes, and for the combination of an expansion chamber with a resonator. Experimental curves of attenuation plotted against frequency are presented for 77 different mufflers with a reflection-free tailpipe termination. The experiments were made at room temperature without flow; the sound source was a loud-speaker. A method is given for including the tailpipe reflections in the calculations. Experimental attenuation curves are presented for four different muffler-tailpipe combinations, and the results are compared with the theory. The application of the theory to the design of engine-exhaust mufflers is discussed, and charts are included for the assistance of the designer.

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829 - 875 p. : ill.

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  • Accession or Local Control No: 93R21498
  • URL: http://hdl.handle.net/2060/19930092208 External Link
  • Report No.: NACA-TR-1192
  • Center for AeroSpace Information Number: 19930092208
  • Archival Resource Key: ark:/67531/metadc60567

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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).

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  • October 6, 1952

Added to The UNT Digital Library

  • Nov. 17, 2011, 5:13 p.m.

Description Last Updated

  • April 10, 2018, 7:46 p.m.

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Davis, Don D., Jr.; Stokes, George M.; Moore, Dewey & Stevens, George L., Jr. Theoretical and experimental investigation of mufflers with comments on engine-exhaust muffler design, report, October 6, 1952; (https://digital.library.unt.edu/ark:/67531/metadc60567/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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