Abstract Three-dimensional dynamic stall was observed on the rotor of a fully equipped subscale helicopter model in a wind tunnel. Results of stereoscopic particle image velocimetry measurements on the retreating blade clearly revealed the large-scale dynamic stall vortex at 50% and 60% blade radius. The small-scale shear layer vortices that constitute the large-scale dynamic stall vortex were identified and localised. Based on the spatial distribution of these small-scale vortices, the characteristic large-scale structure was found to be unexpectedly compact. Along with an apparent spanwise flexion of the dynamic stall vortex, these results suggested the rotational motion of the rotor to have a stabilising effect on the formation and convection of the dynamic stall vortex. The velocity field information available provides a basis for validating recent computational fluid dynamics results of three-dimensional dynamic stall.
Dynamic stall on a fully equipped helicopter model
Aerospace Science and Technology ; 19 , 1 ; 72-76
2011-01-01
5 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Dynamic stall on a fully equipped helicopter model
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