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Unsteady loading of a vertical-axis turbine in the interaction with an upstream deflector

Kim, Daegyoum and Gharib, Morteza (2014) Unsteady loading of a vertical-axis turbine in the interaction with an upstream deflector. Experiments in Fluids, 55 (1). Art. No. 1658. ISSN 0723-4864. https://resolver.caltech.edu/CaltechAUTHORS:20140122-134534605

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Abstract

Torque generation and flow distribution of a lift-based vertical-axis turbine with an upstream deflecting plate are investigated in water tunnel experiments. The deployment of a deflector in front of a lift-based turbine is a promising approach to increase local flow velocity and enhance energy conversion efficiency without consideration for complicated control. For the turbine with the deflector, the phase during which the blade passes near the front end of the turbine has a major contribution to torque increase from the case without the deflector. Meanwhile, the deflector can have a negative effect in torque generation at the phase when the blade moves upstream against free stream if the turbine is placed close to the deflector in a crosswise direction. The change of nearby flow distribution by the deflector is also examined to find its correlation with torque generation. When the blade rotates through the near-wake region of the deflector, the blade can collides with the vortical structure shed from the deflector. This interaction causes significant torque fluctuation.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1007/s00348-013-1658-4DOIArticle
http://link.springer.com/article/10.1007/s00348-013-1658-4PublisherArticle
http://rdcu.be/twkfPublisherFree ReadCube access
Additional Information:© 2014 Springer-Verlag Berlin Heidelberg. Received: 18 May 2013. Revised: 24 September 2013. Accepted: 18 December 2013. This study was supported by a grant from the Gordon and Betty Moore Foundation.
Group:GALCIT
Funders:
Funding AgencyGrant Number
Gordon and Betty Moore FoundationUNSPECIFIED
Issue or Number:1
Record Number:CaltechAUTHORS:20140122-134534605
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140122-134534605
Official Citation:Kim, D. & Gharib, M. Exp Fluids (2014) 55: 1658. doi:10.1007/s00348-013-1658-4
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:43474
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:22 Jan 2014 21:59
Last Modified:03 Oct 2019 06:08

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