Vortex Flows Created by Sinusoidal Oscillation of Three-Dimensional Wings
Abstract
Maneuvering aircraft operate in rapidly changing, time-dependent flow fields and it is well established that certain predictable and controlled unsteady flows enhance aircraft maneuverability. However, any attempt to apply unsteady flow mechanisms to flight vehicles must be preceded by thorough analysis of the basic fluid dynamics of unsteady leading edge and wingtip vortices. This study focuses on the vortex-vortex interactive region produced on a rectangular wing when oscillating through sinusoidal motions about the quarter chord. Phase-locked, stroboscopic photographic flow visualization shows repeatable patterns of leading edge and wingtip vortex size, development, position and convection velocity throughout the pitching cycle. These dynamic fluid characteristics are confirmed and partially quantified using hotwire probe velocities and surface pressure measurements. A representative sampling of the data is presented along with the hypotheses formed and confirmed during the three investigations. (edc)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 31, 1989
- Accession Number
- ADA228622
Entities
People
- J. Ashworth
- M. Luttges
- W. Crisler
Organizations
- Air Force Research Laboratory