Abstract

The flowfielddownstreamof abladeinteracted normallywith awinglet-generated doublevortexwasinvestigated experimentally. Similar to the baseline (with no winglet) interaction, the passage of the double vortex over the blade significantly altered the blade circulation distribution, causing negative vorticity to be shed into its wake, which, together with the turbulent wake motions, acted to trigger the turbulent decay of the vortex core, resulting in an increaseinitssizeandlossofcirculation.Forajunction vortexinteracted directlywith thebladeleadingedge,apair of two counter-rotating vortices, similar to the baseline interaction case, was observed at 1.5 chords downstream of the blade trailing edge. Qualitatively, the variation in double vortex-blade separation distance produced large variations in the vortex core parameters associated with the junction vortex, whereas minor changes for the tip vortex.

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