LOW-SPEED WIND-TUNNEL INVESTIGATION OF SPAN LOAD ALTERATION, FORWARD-LOCATED SPOILERS, AND SPLINES AS TRAILING-VORTEX-HAZARD ALLEVIATION DEVICES ON A TRANSPORT AIRCRAFT MODEL

摘要

An investigation was made in the Langley V/STOL tunnel to determine the effectiveness of a forward-located spoiler, a spline, and a span load alteration due to a flap configuration change as trailing-vortex-hazard alleviation methods. For the transport aircraft model in the normal approach configuration, the results indicate that either a forward-located spoiler or a spline is effective in reducing the trailing-vortex hazard. The results also indicate that large changes in span loading, due to retraction of the outboard flap, may be an effective method of reducing the trailing-vortex hazard.