Effect of core size on the rise and demise of trailing vortices
Abstract
Experiments were conducted with five lifting surfaces to investigate the evolution of trailing vortices in stratified and unstratified water. The vortex trajectories were determined as a function of the relative depth D/bo, normalized time Vot/bo, stratification parameter Nbo/Vo, and the relative vortex core size ro/bo. The results have shown that the vortices rise only to a finite height as they gradually demise under the influence of turbulence, sinusoidal instability, and the vortex breakdown. The effect of stratification is to reduce the lifespan of vortices and the maximum height attained by them. Various approximate analyses have been examined and new ones have been proposed to determine the lifespan of the trailing vortices.
- Publication:
-
Progress Report
- Pub Date:
- December 1982
- Bibcode:
- 1982nps..reptU....S
- Keywords:
-
- Cores;
- Lift Devices;
- Vortex Breakdown;
- Vortices;
- Delta Wings;
- Fluid Mechanics;
- Stratification;
- Turbulence Effects;
- Underwater Trajectories;
- Water;
- Fluid Mechanics and Heat Transfer