NDLI: Wind-tunnel investigation of aerodynamic efficiency of three planar elliptical wings with curvature of quarter-chord line

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Wind-tunnel investigation of aerodynamic efficiency of three planar elliptical wings with curvature of quarter-chord line

Content Provider	NASA Technical Reports Server (NTRS)
Author	Mineck, Raymond E. Vijgen, Paul M. H. W.
Copyright Year	1993
Description	Three planar, untwisted wings with the same elliptical chord distribution but with different curvatures of the quarter-chord line were tested in the Langley 8-Foot Transonic Pressure Tunnel (8-ft TPT) and the Langley 7- by 10-Foot High-Speed Tunnel (7 x 10 HST). A fourth wing with a rectangular planform and the same projected area and span was also tested. Force and moment measurements from the 8-ft TPT tests are presented for Mach numbers from 0.3 to 0.5 and angles of attack from -4 degrees to 7 degrees. Sketches of the oil-flow patterns on the upper surfaces of the wings and some force and moment measurements from the 7 x 10 HST tests are presented at a Mach number of 0.5. Increasing the curvature of the quarter-chord line makes the angle of zero lift more negative but has little effect on the drag coefficient at zero lift. The changes in lift-curve slope and in the Oswald efficiency factor with the change in curvature of the quarter-chord line (wingtip location) indicate that the elliptical wing with the unswept quarter-chord line has the lowest lifting efficiency and the elliptical wing with the unswept trailing edge has the highest lifting efficiency; the crescent-shaped planform wing has an efficiency in between.
File Size	3185541
Page Count	86
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19940012101
Archival Resource Key	ark:/13960/t52g2nd8g
Language	English
Publisher Date	1993-10-01
Access Restriction	Open
Subject Keyword	Aerodynamics Chords Geometry Pitching Moments Planforms Subsonic Speed Reynolds Number Zero Lift Wing Tips Ellipses Induced Drag Lift Rectangular Planforms Wings Laminar Flow Airfoils Efficiency Flow Distribution Wind Tunnel Tests Boundary Layer Transition Angle of Attack Curvature 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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