Design and performance of family of diffusing scrolls with mixed-flow impeller and vaneless diffuser

Brown, W. Byron; Bradshaw, Guy R.

Design and performance of family of diffusing scrolls with mixed-flow impeller and vaneless diffuser

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Description

A family of diffusing scrolls was designed for use with a mixed-flow impeller and a small-diameter vaneless diffuser. The design theory, intended to maintain a uniform pressure around the scroll inlet, permits determination of the position of scroll cross sections of preassigned area by considering the radial variation in fluid density and the effects of friction along the scroll. Inasmuch as the design method leaves the cross-sectional shape undetermined, the effect of certain variations in scroll shape was investigated by studying scrolls having angles of divergence (of the scroll walls downstream of the entrance section) of 24 degrees, 40 degrees, … continued below

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305 - 314 p. : ill.

Creation Information

Brown, W. Byron & Bradshaw, Guy R. October 1947.

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This report is part of the collection entitled: National Advisory Committee for Aeronautics Collection and was provided by the UNT Libraries Government Documents Department to the UNT Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 480 times. More information about this report can be viewed below.

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Flight Propulsion Research Laboratory National Advisory Committee for Aeronautics. Lewis Flight Propulsion Lab

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Main Title: Design and performance of family of diffusing scrolls with mixed-flow impeller and vaneless diffuser
Series Title: NACA Technical Reports

Description

A family of diffusing scrolls was designed for use with a mixed-flow impeller and a small-diameter vaneless diffuser. The design theory, intended to maintain a uniform pressure around the scroll inlet, permits determination of the position of scroll cross sections of preassigned area by considering the radial variation in fluid density and the effects of friction along the scroll. Inasmuch as the design method leaves the cross-sectional shape undetermined, the effect of certain variations in scroll shape was investigated by studying scrolls having angles of divergence (of the scroll walls downstream of the entrance section) of 24 degrees, 40 degrees, and 80 degrees. A second 80 degree scroll was of asymmetrical construction and a third was plaster-cast instead of sand-cast. Each scroll was tested as a compressor component at actual impeller tip speeds of 700 to 1300 feet per second from full throttle to surge.

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305 - 314 p. : ill.

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English

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Accession or Local Control No: 93R21291
URL: http://hdl.handle.net/2060/19930092001 External Link
Report No.: NACA-TR-936
Center for AeroSpace Information Number: 19930092001
Archival Resource Key: ark:/67531/metadc60253

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This report is part of the following collections of related materials.

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).

Technical Report Archive and Image Library

The Technical Report Archive & Image Library (TRAIL) identifies, acquires, catalogs, digitizes and provides unrestricted access to U.S. government agency technical reports. The mission of TRAIL is to ensure preservation, discoverability, and persistent open access to government technical publications regardless of form or format.

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Creation Date

October 1947

Added to The UNT Digital Library

Nov. 17, 2011, 5:13 p.m.

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March 27, 2018, 11:29 a.m.

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Brown, W. Byron & Bradshaw, Guy R. Design and performance of family of diffusing scrolls with mixed-flow impeller and vaneless diffuser, report, October 1947; (https://digital.library.unt.edu/ark:/67531/metadc60253/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

Design and performance of family of diffusing scrolls with mixed-flow impeller and vaneless diffuser

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