Effect of the number of blades and solidity on the performance of a vertical axis wind turbine

PL Delafin, T Nishino, L Wang, A Kolios

Research output: Contribution to journalArticle

14 Citations (Scopus)
63 Downloads (Pure)

Abstract

Two, three and four bladed ø-shape Vertical Axis Wind Turbines are simulated using a free-wake vortex model. Two versions of the three and four bladed turbines are considered, one having the same chord length as the two-bladed turbine and the other having the same solidity as the two-bladed turbine. Results of the two-bladed turbine are validated against published experimental data of power coefficient and instantaneous torque. The effect of solidity on the power coefficient is presented and the instantaneous torque, thrust and lateral force of the two-, three- and four-bladed turbines are compared for the same solidity. It is found that increasing the number of blades from two to three significantly reduces the torque, thrust and lateral force ripples. Adding a fourth blade further reduces the ripples except for the torque at low tip speed ratio. This work aims to help choosing the number of blades during the design phase of a vertical axis wind turbine.

Original languageEnglish
Article number022033
Number of pages8
JournalJournal of Physics: Conference Series
Volume753
DOIs
Publication statusPublished - 3 Oct 2016

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wind turbines
turbines
blades
Wind turbines
Turbines
torque
Torque
ripples
thrust
tip speed
coefficients
wakes
low speed
Vortex flow
vortices

Keywords

  • vertical axis wind turbines
  • solidity
  • performance
  • free-wake vortex model

Cite this

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Effect of the number of blades and solidity on the performance of a vertical axis wind turbine. / Delafin, PL; Nishino, T; Wang, L; Kolios, A.

In: Journal of Physics: Conference Series, Vol. 753, 022033, 03.10.2016.

Research output: Contribution to journalArticle

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AU - Delafin, PL

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AU - Wang, L

AU - Kolios, A

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AB - Two, three and four bladed ø-shape Vertical Axis Wind Turbines are simulated using a free-wake vortex model. Two versions of the three and four bladed turbines are considered, one having the same chord length as the two-bladed turbine and the other having the same solidity as the two-bladed turbine. Results of the two-bladed turbine are validated against published experimental data of power coefficient and instantaneous torque. The effect of solidity on the power coefficient is presented and the instantaneous torque, thrust and lateral force of the two-, three- and four-bladed turbines are compared for the same solidity. It is found that increasing the number of blades from two to three significantly reduces the torque, thrust and lateral force ripples. Adding a fourth blade further reduces the ripples except for the torque at low tip speed ratio. This work aims to help choosing the number of blades during the design phase of a vertical axis wind turbine.

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KW - performance

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