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Journal of Flow Visualization and Image Processing
SJR: 0.11 SNIP: 0.312 CiteScore™: 0.1

ISSN Imprimer: 1065-3090
ISSN En ligne: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v1.i4.60
pages 337-346

VISUALIZATION AND IMAGE PROCESSING OF THE FLOW IN AND AROUND A SAVONIUS ROTOR

Nobuyuki Fujisawa
Visualization Research Center, Niigata University, Niigata, Japan
Y. Taguchi
Department of Mechanical Engineering, Gunma University, Kiryu, Japan

RÉSUMÉ

The phase-averaged velocity distributions in and around a Savonius rotor with and without rotation are measured by a particle image velocimetry with a conditional sampling technique, and the results are compared with the smoke-wire visualization pictures. The measured velocity distribution clearly reproduces the flow structure in and around the rotor observed in the qualitative visualizations. The present measurement also indicates quantitative information for the rotating rotor, such as the development of Coanda-like velocity distribution on the convex side of the advancing blade, its flow separation, and the following formation of the vortices, and the appearance of the flow concentration effect on the advancing blade by the presence of circulation. The effect of tip speed ratio on the flow mechanism is also discussed.


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