Drag Reduction and Wake Minimization on Marine Vehicles
Abstract
Fluid dynamic research has shown that novel, three dimensional contouring can be used to generate streamwise vorticity. Such streamwise vorticity enhances two stream mixing and can reduce separation regions on bluff bodies. This program investigated the possibility of using similar three dimensional contouring to passively control flow separation, wake mixing, and tip vortices on marine vehicles. Experimentally, sub scale screening tests of three dimensionally contoured airfoils were conducted in an existing wind tunnel at Western New England College. Seven airfoil models were designed, fabricated, and tested. The seven contours included a baseline airfoil, two leading edge groove contours, a midspan groove contour, a triangular trailing edge contour, and two lobed trailing edge contours. Traverse data and lift/drag balance data were taken with each airfoil. Test results indicate leading edge grooves show the most promise for airfoil lift and drag improvements, triangular trailing edge contours for wake mixing enhancements, and lobed trailing edge contours for tip vortex dispersion. All results were obtained from scale model testing at a low Reynolds Number. Boundary layer trips were needed to help simulate actual turbulent boundary layer flowfields.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1991
- Accession Number
- ADA241270
Entities
People
- Craig A. Hunter
- Pasquale Delore
- Walter M. Presz Jr.