Coalescence of Jets in the Flow Through Wind Tunnel Screens

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Screens are utilised upstream of a wind tunnel contraction to produce a more uniform flow in the test section and to control/reduce the background free-stream turbulence level. A widely adopted “rule-of-thumb” for screen selection is that the open-area ratio should be greater than 57%, otherwise it is claimed that the jets flowing through the openings in the screen will coalesce and create local regions of non-uniform and unsteady flow, which defeats the purpose of using the screen. However, the only evidence for jet coalescence appearing in the literature is for the flow through a 2D array of wires, i.e. a zither.

 

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