Wind-tunnel investigations of wings with serrated sharp trailing edgesExploratory wind-tunnel force measurements are presented for two wing geometries with small-scale planar and nonplanar serrated trailing-edge devices (chord-Reynolds numbers ranged from 1.0 to 3.7 million). The planar serrated trailing-edge extensions reduced the drag at conditions when trailing-edge separation occurred at low angles of attack. The introduction of serrations reduced or eliminated the drag penalty, due to the small (1-2 percent of the chord length) nonplanar trailing-edge flaps, while maintaining the effects of increase in camber. The presence of streamwise vortices immediately downstream of the serrated trailing edges is believed to have favorably affected the boundary-layer flow approaching the trailing edge and the near-wake development, resulting in reduced pressure (form) drag.
Document ID
19890057891
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Vijgen, P. M. H. W. (High Technology Corp. Hampton, VA, United States)
Van Dam, C. P. (California, University Davis, United States)
Holmes, B. J. (High Technology Corp. Hampton, VA, United States)
Howard, F. G. (NASA Langley Research Center Hampton, VA, United States)