ID:
publications-1042
Type:
PEER_REVIEWED_ARTICLE
Year:
2016
Authors:
K. Steiros , P. J. K. Bruce , O. R. H. Buxton , J. C. Vassilicos
Title:
Power consumption and form drag of regular and fractal-shaped turbines in a stirred tank
Venue/Journal:
DOI:
10.1002/aic.15414
Research type:
Uncategorized
Water System:
River Basins
Technical Focus:
Abstract:
Previous windâtunnel measurements have shown that fractalâshaped plates have increased drag compared to square plates of the same area. In this study, the power consumption and drag of turbines with fractal and rectangular blades in a stirred tank are measured. Power number decreases from rectangular to fractal impellers by over 10%, increasingly so with fractal iteration number. Our results suggest that this decrease is not caused by the wake interaction of the blades, nor solely by the wake interaction with the walls either. Pressure measurements on the bladesâ surface show that fractal blades have lower drag than the rectangular ones, opposite to the wind tunnel experiment results. All tested bladesâ center of pressure radius increases with Re, while their drag coefficient decreases, a possible effect of the solid body rotation expansion with Re. Spectral analysis of the pressure signal reveals two peaks possibly connected to the bladesâ roll vortices. © 2016 American Institute of Chemical Engineers AIChE J, 63: 843â854, 2017
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320560
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