Experimental Study of Isothermal Wake-Flow Characteristics of Various Flame-Holder Shapes

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An investigation of the isothermal wake-flow characteristics of several flame-holder shapes was carried out in a 4- by 4-inch flow chamber. The effects of flame-holder-shape changes on the characteristics of the Karman vortices and thus on the recirculation zones to which experimenters have related the combustion process were obtained for several flame holders. The results may furnish a basis of correlation, of combustion efficiency and stability for similarly shaped flame holders in combustion studies. Values of the spacing ratio-(ratio of lateral spacing to longitudinal spacing of vortices] obtained for the various shapes approximated the theoretical value of 0.36 given by ... continued below

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Younger, G. G.; Gabriel, D. S. & Mickelsen, W. R. January 23, 1952.

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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 165 times , with 8 in the last month . More information about this report can be viewed below.

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  • Main Title: Experimental Study of Isothermal Wake-Flow Characteristics of Various Flame-Holder Shapes
  • Series Title: NACA Research Memorandums

Description

An investigation of the isothermal wake-flow characteristics of several flame-holder shapes was carried out in a 4- by 4-inch flow chamber. The effects of flame-holder-shape changes on the characteristics of the Karman vortices and thus on the recirculation zones to which experimenters have related the combustion process were obtained for several flame holders. The results may furnish a basis of correlation, of combustion efficiency and stability for similarly shaped flame holders in combustion studies. Values of the spacing ratio-(ratio of lateral spacing to longitudinal spacing of vortices] obtained for the various shapes approximated the theoretical value of 0.36 given by the Karman stability analysis. Variations in vortex strength of more than 200 percent and in frequency of more than 60 percent were accomplished by varying flame-holder shape. A maximum increase in the recirculation parameter of 56 percent over that for a conventional V-gutter was also obtained. Varying flameholder shape and size enables the designer to select many schedules of variations in vortex strength and frequency- not obtainable by changing size only and may make it possible to approach theoretical maximum vortex strength for any given frequency.

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  • : 73N75035
  • URL: http://hdl.handle.net/2060/19730065793 External Link
  • Report No.: NACA-RM-E51K07
  • Center for AeroSpace Information Number: 19730065793
  • Archival Resource Key: ark:/67531/metadc53304

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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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  • January 23, 1952

Added to The UNT Digital Library

  • Nov. 11, 2011, 7:22 p.m.

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  • Jan. 27, 2017, 3:24 p.m.

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Younger, G. G.; Gabriel, D. S. & Mickelsen, W. R. Experimental Study of Isothermal Wake-Flow Characteristics of Various Flame-Holder Shapes, report, January 23, 1952; (digital.library.unt.edu/ark:/67531/metadc53304/: accessed October 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.