Smoke study of nozzle secondary flows in a low-speed turbine

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Description

Still and motion pictures were made of boundary-layer and wake secondary-flow phenomena visualized by smoke. Two annular cascades of turbine nozzles were used, both designed for constant discharge angle but differing in blade shape and suction-surface velocity distribution. Flows were similar to those obtained with pressure and angle measurements at near-sonic airspeeds. Boundary-layer cross-channel and trailing-edge radial flows caused vortices and an accumulation of low-momentum air at the hub, which may affect flow in following blade rows. Motion of a downstream rotor blade row produced pulsations in trailing-edge radial flow. The motion-picture supplement may be obtained on loan from NACA ... continued below

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24 p. : ill.

Creation Information

Kofskey, Milton G. & Allen, Hubert W. November 1954.

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

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  • Main Title: Smoke study of nozzle secondary flows in a low-speed turbine
  • Series Title: NACA Technical Notes

Description

Still and motion pictures were made of boundary-layer and wake secondary-flow phenomena visualized by smoke. Two annular cascades of turbine nozzles were used, both designed for constant discharge angle but differing in blade shape and suction-surface velocity distribution. Flows were similar to those obtained with pressure and angle measurements at near-sonic airspeeds. Boundary-layer cross-channel and trailing-edge radial flows caused vortices and an accumulation of low-momentum air at the hub, which may affect flow in following blade rows. Motion of a downstream rotor blade row produced pulsations in trailing-edge radial flow. The motion-picture supplement may be obtained on loan from NACA Headquarters, Washington, D.C.

Physical Description

24 p. : ill.

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  • Accession or Local Control No: 93R13287
  • URL: http://hdl.handle.net/2060/19930083997 External Link
  • Report No.: NACA-TN-3260
  • Center for AeroSpace Information Number: 19930083997
  • Archival Resource Key: ark:/67531/metadc57233

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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

  • November 1954

Added to The UNT Digital Library

  • Nov. 16, 2011, 7:33 a.m.

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  • April 10, 2018, 6:42 p.m.

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Kofskey, Milton G. & Allen, Hubert W. Smoke study of nozzle secondary flows in a low-speed turbine, report, November 1954; (digital.library.unt.edu/ark:/67531/metadc57233/: accessed October 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.