Generation of Two-Dimensional Gust Fields in Subsonic Wind-Tunnels,
DEUTSCHE FORSCHUNGS- UND VERSUCHSANSTALT FUER LUFT- UND RAUMFAHRT E V BRUNSWICK (GERMANY F R)
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For a variety of flight-vehicles, problems are to be expected during subsonic flight in turbulence. This concerns mainly slow flying helicopters, tilt rotorcraft, aircraft maneuvering at high angles of attack, wing in ground effect vehicles and aircraft with active controlled wings. Until now, no fundamental investigations of the problem of gust generation in wind-tunnels have been undertaken. Investigations of gust generation have now started in a model subsonic wind-tunnel of the DFVLR in Braunschweig. In order to recognize the influence of the main parameters, like number of lift generating wings, chord length, trailing edge-flap or jet-flap, constant chord wing or side-wall mounted winglets, four different types of gust generators were investigated. The gust field was harmonically oscillating. Frequency response measurements of the gust angle of attack were made, covering the complete volume of the test section. Additionally the flow field in the wind-tunnel behind harmonically oscillating gust generator-flaps was calculated.