Uniform inlet conditions for the NPS subsonic cascade wind tunnel
McEligot, Donald M
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Measurements of the flow field between the turning vanes and inlet plane for the test blades in the NPS Subsonic Cascade Wind Tunnel to January 1981 are reviewed. Typical velocities in this section are of the order of 100 to 200 ft/sec and the distance is less than two feet. It is concluded that some modification is necessary to achieve one percent uniformity for the mean velocity at the test cascade inlet plane and several approaches are suggested. From a study of simple analyses for turbulent wakes and the effects of wire gauze screens, it is predicted that the desired uniformity may be obtained by installing a single screen of high resistance coefficient; the necessary pressure drop and turning of the flow would be substantial. Placing the turning vanes at closer pitch might be adequate, but further measurements and numerical analysis would probably be necessary for design purposes.
NPS Report NumberNPS67-81-019PR
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