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considerations for the installation of honeycomb and screens to reduce wind-tunnel turbulenceTests were conducted on a half-scale model representing a 0.914-m (3.0-ft) square stream tube of the flow through the fourth corner and settling chamber of the Langley 8-Foot Transonic Pressure Tunnel. The model included the tube cooler 45 degree turning vanes, and the turbulence reduction screens and honeycomb, which were the subject of the tests. Hot-wire measurements of the turbulence reduction for various combinations of screens and honeycomb were made at various duct speeds. Of the four sizes of honeycomb cells tested, none were found to have a superior performance advantage. The effectiveness of screens and honeycomb in reducing turbulence is greatly affected by relatively minor physical damage; therefore, extreme care must be exercised in installing and maintaining honeycomb or screens if the turbulence reduction performance is to be maintained.
Document ID
19810020599
Document Type
Technical Memorandum (TM)
Authors
Scheiman, J.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 4, 2013
Publication Date
August 1, 1981
Subject Category
RESEARCH AND SUPPORT FACILITIES (AIR)
Report/Patent Number
L-14109
NASA-TM-81868
Funding Number(s)
PROJECT: RTOP 505-31-43-02
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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