Abstract
The flow field around a Darrieus rotor in dynamic stall is studied by flow visualization and PIV measurements. The visualization is carried out by dye injection technique while the phase averaged velocity distributions around the blade are measured by PIV combined with a conditional imaging technique. The results indicate the appearance of dynamic stall phenomenon due to the shedding of two pairs of vortices from the blade during one rotation of the rotor. These stall vortices are produced by the separation of flow over the inner surface of the blade and the formation of roll-up vortices from the outer surface. The second stall vortices develop along the blade and strongly interact with the flow field near the blade, affecting the aerodynamic performance of the rotor.
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Authors’ Profiles Nobuyuki Fujisawa: He received his bachelor of engineering degree in mechanical engineering in 1977 from Iwate University, and master (1979) and doctor (1983) of engineering degrees from Tohoku University in Japan. His doctor thesis is related to the stability and turbulence measurements in curved wall jets . After he joined to Gunma University in 1983, he worked as a research associate in the field of turbomachinery, turbulence modelling and flow visualization. Later he promoted to an associate professor in mechatronics in 1991 and worked in the field of active control and image processing. Since 1997, he has been a professor of Niigata University and continuing the research in active control of flow and flow-induced noise, flow visualization and image processing and PIV in thermal and fluid phenomena.
Mitsuyoshi Takeuchi: He received his bachelor (1996) and master (1998) of engineering degrees in mechanical engineering from Gunma University in Japan. He is currently an engineer working in Nihon Kohden Corporation in Japan.
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Fujisawa, N., Takeuchi, M. Flow visualization and PIV measurement of flow field around a darrieus rotor in dynamic stall. J Vis 1, 379–386 (1999). https://doi.org/10.1007/BF03181428
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DOI: https://doi.org/10.1007/BF03181428