The aerodynamic performances of aircraft wings, helicopter rotors, marine propellers, and turbomachines are related to the presence of turbulent boundary layers and vortex sheet formation. The mutual interaction between boundary layers makes three-dimensional the phenomenon. This aspect is particularly evident at the wing /body junction and at the extremity of the wings or blades where tip vortices are formed. By means of laser Doppler anemometry, the velocity field is experimentally analyzed close to the tip in the near wake generated by a symmetrical wing with a rectangular plant. The analysis of experimental results shows that there exists a strong axial current in the core of the tip vortex. A velocity logaritmic trend is formed in the zone where there is interaction between the irrotational flow and the core vortex. (Author)
Experimental analysis of tip vortex by Laser Doppler Anemometry / L., Accardo; A., Cenedese; Cioffi, Francesco. - STAMPA. - (1984). (Intervento presentato al convegno International Symposium on Applications of Laser Anemometry to Fluid Mechanics tenutosi a Lisbon nel 2-5 July 1984).
Experimental analysis of tip vortex by Laser Doppler Anemometry
CIOFFI, Francesco
1984
Abstract
The aerodynamic performances of aircraft wings, helicopter rotors, marine propellers, and turbomachines are related to the presence of turbulent boundary layers and vortex sheet formation. The mutual interaction between boundary layers makes three-dimensional the phenomenon. This aspect is particularly evident at the wing /body junction and at the extremity of the wings or blades where tip vortices are formed. By means of laser Doppler anemometry, the velocity field is experimentally analyzed close to the tip in the near wake generated by a symmetrical wing with a rectangular plant. The analysis of experimental results shows that there exists a strong axial current in the core of the tip vortex. A velocity logaritmic trend is formed in the zone where there is interaction between the irrotational flow and the core vortex. (Author)I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
