On the tip vortex moving inboard before wake expansion drives it outboard
| Autor: | van Kuik, Gijs, Micallef, Daniel, Herraez, Ivan, Ragni, Daniele, 10th European Fluid Mechanics Conference (EFMC10) |
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| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: | |
| Popis: | Several SPIV experiments on model wind turbine rotors1,2,3 focussing on the flow around the tip have shown that after being released the tip vortex first moves to a lower radius. This is in contrast to what is generally assumed, namely that the wake expansion starts immediately. A detailed analysis of one of these experiments, the 2m Ø TUDelft-B rotor tested in the TUD 3m Ø Open Jet Facility, is combined with CFD calculations and a vortex panel code using the full blade geometry. Figure 1 shows the tip of the rotor, the coordinate system and the contour of the flow analysis. For 6 chordwise positions of this contour the spanwise and chordwise vorticity, the associated circulation and the Kutta-Joukowsky loads acting on the chordwise vorticity have been determined. Figure 2 shows the results as a function of the chordwise position. The squares show the CFD data, the diamond marker indicates the experimental data and the triangles present the results of a momentum balance applied to the experimental data. N/A |
| Databáze: | OpenAIRE |
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