Linear theory of boundary effects in open wind tunnels with finite jet lengths

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In the first part, the boundary conditions for an open wind tunnel (incompressible flow) are examined with special reference to the effects of the closed entrance and exit sections. Basic conditions are that the velocity must be continuous at the entrance lip and that the velocities in the upstream and downstream closed portions must be equal. In the second part, solutions are derived for four types of two-dimensional open tunnels, including one in which the pressures on the two free surfaces are not equal. Numerical results are given for every case. In general, if the lifting element is more than ... continued below

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Katzoff, S; Gardner, Clifford S; Diesendruck, Leo & Eisenstadt, Bertram J January 1, 1950.

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

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  • Main Title: Linear theory of boundary effects in open wind tunnels with finite jet lengths
  • Series Title: NACA Technical Reports

Description

In the first part, the boundary conditions for an open wind tunnel (incompressible flow) are examined with special reference to the effects of the closed entrance and exit sections. Basic conditions are that the velocity must be continuous at the entrance lip and that the velocities in the upstream and downstream closed portions must be equal. In the second part, solutions are derived for four types of two-dimensional open tunnels, including one in which the pressures on the two free surfaces are not equal. Numerical results are given for every case. In general, if the lifting element is more than half the tunnel height from the inlet, the boundary effect at the lifting element is the same as for an infinitely long open tunnel. In the third part, a general method is given for calculating the boundary effect in an open circular wind tunnel of finite jet length. Numerical results are given for a lifting element concentrate at a point on the axis.

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  • : 93R21327
  • URL: http://hdl.handle.net/2060/19930092037 External Link
  • Report No.: NACA-TR-976
  • Center for AeroSpace Information Number: 19930092037
  • Archival Resource Key: ark:/67531/metadc60312

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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 1, 1950

Added to The UNT Digital Library

  • Nov. 17, 2011, 5:13 p.m.

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  • Feb. 2, 2017, 10:27 p.m.

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Katzoff, S; Gardner, Clifford S; Diesendruck, Leo & Eisenstadt, Bertram J. Linear theory of boundary effects in open wind tunnels with finite jet lengths, report, January 1, 1950; (digital.library.unt.edu/ark:/67531/metadc60312/: accessed December 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.