Turbulence in the Wake of a Delta Wing
Although the aerodynamics of delta wings has been studied extensively, remarkably little attention has been devoted to the downstream wake. In the present work we study the large- and small-scale turbulent structure in the trailing vortex wake, with a view to understanding the basic instabilities, vertical mixing and decay rate of the primary vortex pair. In our experimental work we use both a water towing tank and a wind tunnel. Our approach involves flow visualization, including PIV and also point-velocity measurements, as well as analytical studies. Initial experiments employed a novel technique of flying delta wings in free flight through water to completely eliminate any disturbances from struts or the towing mechanism.