Effect of Vortex Generators on Crossflow Separation on a Submarine in a TurningManeuver

摘要

The effect of vortex generators on the crossflow separation of a 688 classsubmarine in a turning maneuver was studied. The vortex generators are located on the top and bottom centerline of the submarine. The intent of the vortex generators is to improve turning performance by changing the inherent hydrodynamic forces incurred from crossflow separation in such a maneuver. The number, size, axial location, and local angle of attack of the vortex generators are studied. Oil flow visualization was used as the primary diagnostic in determining the effectiveness of various vortex generator configurations. Force and moment measurements were taken to relate the fluid dynamics to changes in force and moment distribution. The vortex generators were found to be very effective in delaying crossflow separation. Separation was delayed by as much as 35 on the bottom of the submarine model. With the addition of vortex generators, the normal force was reduced up to 33%, the axial force was increased up to 233%, and the yaw moment was increased up to 150%. Also, the vertical force increased up to 150%, the pitching moment increased up to 40%, and the roll moment was unaffected.