NASA Technical Reports Server (NTRS) : Effect pdf

NASA Technical Reports Server (NTRS) : Effect

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An experimental investigation was conducted to assess the effect of surface finish on the longitudinal and lateral aerodynamic characteristics of a highly-swept wing at supersonic speeds. A study of the effects of wing dihedral was also made. Included in the tests were four wing models: three models having 22.5 degrees of outboard dihedral, identical except for surface finish, and a zero-dihedral, smooth model of the same planform for reference. Of the three dihedral models, two were taken directly from the milling machine without smoothing: one having a maximum scallop height of 0.002 inches and the other a maximum scallop height of 0.005 inches. The third dihedral model was handfinished to a smooth surface. Tests were conducted in Test Section 1 of the Unitary Plan Wind Tunnel at NASA-Langley over a range of Mach numbers from 1.8 to 2.8, a range of angle of attack from -5 to 8 degrees, and at a Reynolds numbers per foot of 2 x 10(6).

Selected data were also taken at a Reynolds number per foot of 6 x 10(6). Drag coefficient increases, with corresponding lift-drag ratio decreases were the primary aerodynamic effects attributed to increased surface roughness due to milling machine grooves. These drag and lift-drag ratio increments due to roughness increased as Reynolds number increased

• Creator/s: NASA Technical Reports Server (NTRS
• Date: 8/1/1989
• Year: 1989
• Book Topics/Themes: NASA Technical Reports Server (NTRS), DIHEDRAL ANGLE, LIFT DRAG RATIO, MILLING (MACHINING), SUPERSONIC SPEED, SURFACE ROUGHNESS EFFECTS, SWEPT WINGS, AERODYNAMIC DRAG, ANGLE OF ATTACK, GROOVES, LATERAL STABILITY, LONGITUDINAL STABILITY, MACH NUMBER, REYNOLDS NUMBER, WIND TUNNEL TESTS, WING PROFILES, Darden, Christine M

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