The underlying physics of a rotor in dynamic stall are investigated using a combination of experimental and computational methods. A two-bladed teetering rotor with rigid blades in forward flight is examined in a low speed wind tunnel at an advance ratio of 0.33, where it encounters retreating blade stall. Particle image velocity measurements on the flow near the 270 deg azimuth are used to quantify the radial/axial cross flow field and the chordwise/axial flow field. The measurements capture the radial jet layer caused by radial acceleration and the breakup of this jet into discrete structures due to apparent shear layer instability. The radial variation of the ensemble-averaged separation line over the blade is also captured. Prediction capability using a high-fidelity numerical technique for three different approaches to simulate rotor dynamic stall is compared with experiments.
An exploration of the physics of dynamic stall
Untersuchung der Physik des dynamischen Überziehens
2010
16 Seiten, 12 Bilder, 2 Tabellen, 45 Quellen
Aufsatz (Konferenz)
Englisch
An Exploration of the Physics of Dynamic Stall
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