Determination of boundary-layer transition on three symmetrical airfoils in the NACA full-scale wind tunnel

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Description

For the purpose of studying the transition from laminar to turbulent flow, boundary-layer measurements were made in the NACA full-scale wind tunnel on three symmetrical airfoils of NACA 0009, 0012, and 0018 sections. The effects of variations in lift coefficient, Reynolds number, and airfoil thickness on transition were investigated. Air speed in the boundary layer was measured by total-head tubes and by hot wires; a comparison of transition as indicated by the two techniques was obtained. The results indicate no unique value of Reynolds number for the transition, whether the Reynolds number is based upon the distance along the chord ... continued below

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491 - 505 p.

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Silverstein, Abe & Becker, John V. May 26, 1938.

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

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  • Main Title: Determination of boundary-layer transition on three symmetrical airfoils in the NACA full-scale wind tunnel
  • Series Title: NACA Technical Reports

Description

For the purpose of studying the transition from laminar to turbulent flow, boundary-layer measurements were made in the NACA full-scale wind tunnel on three symmetrical airfoils of NACA 0009, 0012, and 0018 sections. The effects of variations in lift coefficient, Reynolds number, and airfoil thickness on transition were investigated. Air speed in the boundary layer was measured by total-head tubes and by hot wires; a comparison of transition as indicated by the two techniques was obtained. The results indicate no unique value of Reynolds number for the transition, whether the Reynolds number is based upon the distance along the chord or upon the thickness of the boundary layer at the transition point. In general, the transition is not abrupt and occurs in a region that varies in length as a function of the test conditions.

Physical Description

491 - 505 p.

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  • Accession or Local Control No: 93R21002
  • URL: http://hdl.handle.net/2060/19930091712 External Link
  • Report No.: NACA-TR-637
  • Center for AeroSpace Information Number: 19930091712
  • Archival Resource Key: ark:/67531/metadc66295

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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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Creation Date

  • May 26, 1938

Added to The UNT Digital Library

  • Nov. 17, 2011, 10:13 p.m.

Description Last Updated

  • April 30, 2018, 9:13 a.m.

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Silverstein, Abe & Becker, John V. Determination of boundary-layer transition on three symmetrical airfoils in the NACA full-scale wind tunnel, report, May 26, 1938; (digital.library.unt.edu/ark:/67531/metadc66295/: accessed July 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.