NDLI: Investigation of leading-edge flap performance on delta and double-delta wings at supersonic speeds

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Investigation of leading-edge flap performance on delta and double-delta wings at supersonic speeds

Content Provider	NASA Technical Reports Server (NTRS)
Author	Wood, Richard M. Covell, Peter F. Miller, David S.
Copyright Year	1987
Description	An investigation of the aerodynamic performance of leading-edge flaps on three clipped delta and three clipped double-delta wing planforms with aspect ratios of 1.75, 2.11, and 2.50 was conducted in the Langley Unitary Plan Wind Tunnel at Mach numbers of 1.60, 1.90, and 2.16. A primary set of fullspan leading-edge flaps with similar root and tip chords were investigated on each wing, and several alternate flap planforms were investigated on the aspect-ratio-1.75 wings. All leading-edge flap geometries were effective in reducing the drag at lifting conditions over the range of wing aspect ratios and Mach numbers tested. Application of a primary flap resulted in better flap performance with the double-delta planform than with the delta planform. The primary flap geometry generally yielded better performance than the alternate flap geometries tested. Trim drag due to flap-induced pitching moments was found to reduce the leading-edge flap performance more for the delta planform than for the double-delta planform. Flow-visualization techniques showed that leading-edge flap deflection reduces crossflow shock-induced separation effects. Finally, it was found that modified linear theory consistently predicts only the effects of leading-edge flap deflection as related to pitching moment and lift trends.
File Size	92352346
Page Count	125
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19870010800
Archival Resource Key	ark:/13960/t13n7201h
Language	English
Publisher Date	1987-04-01
Access Restriction	Open
Subject Keyword	Aerodynamics Linear Systems Pitching Moments Planforms Drag Leading Edge Flaps Supersonic Speed Delta Wings Wind Tunnel Tests Experiment Design Aspect Ratio Mach Number Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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