Theoretical Investigation of Submerged Inlets at Low Speeds

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The general characteristics of the flow field in a submerged air inlet are investigated by theoretical, wind-tunnel, and visual-flow studies. Equations are developed for calculating the laminar and turbulent boundary-layer growth along the ramp floor for parallel, divergent, and convergent ramp walls, and a general equation is derived relating the boundary-layer pressure losses to the boundary-layer thickness. It is demonstrated that the growth of the boundary layer on the floor of the divergent-ramp inlet is retarded and that a vortex pair is generated in such an inlet. Functional relationships are established between the pressure losses in the vortices and the ... continued below

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Sacks, Alvin H. & Spreiter, John R. August 1, 1951.

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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 51 times . More information about this report can be viewed below.

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  • Main Title: Theoretical Investigation of Submerged Inlets at Low Speeds
  • Series Title: NACA Technical Notes

Description

The general characteristics of the flow field in a submerged air inlet are investigated by theoretical, wind-tunnel, and visual-flow studies. Equations are developed for calculating the laminar and turbulent boundary-layer growth along the ramp floor for parallel, divergent, and convergent ramp walls, and a general equation is derived relating the boundary-layer pressure losses to the boundary-layer thickness. It is demonstrated that the growth of the boundary layer on the floor of the divergent-ramp inlet is retarded and that a vortex pair is generated in such an inlet. Functional relationships are established between the pressure losses in the vortices and the geometry of the inlet. A general discussion of the boundary layer and vortex formations is included, in which variations of the various losses and of the incremental external drag with mass-flow ratio are considered. Effects of compressibility are also discussed.

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  • Accession or Local Control No: 89N70249
  • URL: http://hdl.handle.net/2060/19890067876 External Link
  • Report No.: NACA-TN-2323
  • Center for AeroSpace Information Number: 19890067876
  • Archival Resource Key: ark:/67531/metadc53583

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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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  • August 1, 1951

Added to The UNT Digital Library

  • Nov. 11, 2011, 7:22 p.m.

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  • April 6, 2018, 1:58 p.m.

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Sacks, Alvin H. & Spreiter, John R. Theoretical Investigation of Submerged Inlets at Low Speeds, report, August 1, 1951; (digital.library.unt.edu/ark:/67531/metadc53583/: accessed April 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.