Effects of Fin and Jet Vortex Generators on the Crossflow

Abstract

The effect of fin and jet vortex generators on the crossflow separation of a submersible vehicle in a sideslip was studied. The sideslip orientation simulates the dominant features of a turning maneuver. The vortex generators are located on the top and bottom centerline of the body to improve turning performance by changing the crossflow separation and the resultant hydrodynamic forces. Oil-flow visualization and force and moment measurements are used as the primary diagnostics. The fins are found to be very effective in delaying crossflow separation, while the jets were not. In addition, the oil flows revealed the importance of locating vortex generators near the bow and the critical role a forward-mounted, low-aspect-ratio appendage plays in the near-body fluid dynamics. Overall the fins were found to be viable as a concept for flow control, while the jets employed were not. The concept of using vortex generators to control flow separation and thus forces and moments applies equally well to all bodies of revolution, including aircraft fuselages and missiles