An investigation was made in the Langley V/STOL tunnel to determine, by the trailing wing sensor technique, the effectiveness of various segments of the existing flight spoilers on an extended-range wide-body tri-jet transport airplane model when they were deflected as trailing-vortex-alleviation devices. On the transport model with the approach flap configuration, the four combinations of flight-spoiler segments investigated were effective in reducing the induced rolling moment on the trailing wing model by as much as 25 to 45 percent at downstream distances behind the transport model of 9.2 and 18.4 transport wing spans. On the transport airplane model with the landing flap configuration, the four combinations of flight-spoiler segments investigated were effective in reducing the induced rolling moment on the trailing wing model by as much as 35 to 60 percent at distances behind the transport model of from 3.7 to 18.4 transport wing spans, 18.4 spans being the downstream limit of distances used. Longitudinal aerodynamic characteristics of approach flap and landing flap configurations of a transport airplane model with flight spoilers; variables include angle of attack, lift coefficient, drag coefficient, horizontal tail incidence, pitching-moment coefficient, deflection angle of spoiler segments, trailing wing rolling-moment coefficient, trailing wing location relative to wing tip, and distance downstream behind transport airplane model; 21 figures include numeric data.
Low Speed Wind Tunnel Investigation of Flight Spoilers as Trailing-Vortex-Alleviation Devices on an Extended-Range Wide Body Tri-Jet Airplane Model
1976
53 pages
Report
No indication
English