1973-02-01

Flight Test Studies of the Formation and Dissipation of Trailing Vortices 730295

A flight test program has been conducted to measure experimentally parameters which describe the characteristics of vortex instability and behavior. Three basic atmospheric flight conditions were investigated: steady level flight in calm air, steady level flight in light gusting air and light winds, and unsteady flight produced by control surface oscillations in calm air. A DeHavilland Beaver DHC-2 airplane and a Beechcraft T-34B airplane were used in the investigation. Smoke grenades were located near the wing tips of each airplane such that the vortices could be seeded with smoke and thus made visible. This made it possible to take measurements from photographs of the visible vortices. The experimental results show wavelengths of vortex instabilities, dissipation time of trailing vortices, effects of atmospheric current or gust, and the effect of control surface oscillation. These results provide additional experimental verification of the existence of vortex wake instability predicted by theory and show that small oscillations in pitch at a critical frequency accelerate the dissipation of high-intensity vortices.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Aircraft Vortex Wake - Environmental and Flight Safety Aspects of the Problem

985590

View Details

TECHNICAL PAPER

Recent Development in Wake Vortex Minimization

780524

View Details

TECHNICAL PAPER

Periodic Structures within the Formation Region of Trailing Vortices

2006-01-1032

View Details

X