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- Title
Experimental investigation of a variable geometry vertical axis wind turbine.
- Authors
Prince, Simon A; Badalamenti, Carmine; Georgiev, Dimitar
- Abstract
An experimental study is presented on the performance of a vertical axis wind turbine with variable blade geometry of the design developed by Austin Farrah. This is experimentally compared with the performance of a correspondingly sized Bach-type Savonius turbine using the same electrical generator and measurement instrumentation in a wind tunnel. Experiments were performed for Reynolds numbers, based on blade chord, in the range 5 × 103 to 1 × 105, and for blade settings between −40° and +40o. The study shows that for the tip speed ratios that have been investigated, the Farrah vertical axis wind turbine design can only marginally outperform a corresponding two-bladed Bach-type Savonius turbine and then only when its blades are set to 40° pitch angle. The presence of a small inner cylinder, which rotates with the turbine, does not enhance its performance due to the fact that it is immersed in an extensive column of relatively static air.
- Subjects
BACH, Johann Sebastian, 1685-1750; VERTICAL axis wind turbines; WIND turbine blades; WIND tunnels; REYNOLDS number
- Publication
Wind Engineering, 2021, Vol 45, Issue 4, p904
- ISSN
0309-524X
- Publication type
Article
- DOI
10.1177/0309524X20935134