Rotor solidity effects on the performance of vertical-axis wind turbines at high Reynolds numbers

M. A. Miller, S. Duvvuri, W. D. Kelly, M. Hultmark

Research output: Contribution to journalConference article

2 Citations (Scopus)

Abstract

Vertical Axis Wind Turbines have yet to see wide-spread use as a means of harvesting the kinetic energy of the wind. This may be due in part to the difficulty in modeling the relatively complex flow field and hence performance of these units. Additionally, similar to Horizontal Axis Wind Turbines, VAWTs are difficult to properly test in a conventional wind tunnel. Typically Reynolds numbers cannot be matched or the turbine geometry must be altered, limiting the applicability of the results. Presented in the following is a set of experiments in a specialized, high-pressure wind tunnel used to achieve high Reynolds numbers with a small-scale model. The performance change of this model is investigated at two different solidities and over nearly a decade of Reynolds numbers (based on diameter: 600, 000 ≤ ReD ≤ 5 × 106). The non- dimensional power coefficient displays behavior consistent with Reynolds number invariance, regardless of solidity. In addition, the change in performance as this limit is approached also shows no direct dependence on the solidity for the VAWT geometry used in this study. The results of this work have direct application for modeling and simulation efforts concerning the performance of new VAWT designs.

Original languageEnglish (US)
Article number052015
JournalJournal of Physics: Conference Series
Volume1037
Issue number5
DOIs
StatePublished - Jun 19 2018
Event7th Science of Making Torque from Wind, TORQUE 2018 - Milan, Italy
Duration: Jun 20 2018Jun 22 2018

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wind turbines
high Reynolds number
rotors
Reynolds number
wind tunnels
scale models
turbines
geometry
invariance
flow distribution
kinetic energy
coefficients
simulation

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

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title = "Rotor solidity effects on the performance of vertical-axis wind turbines at high Reynolds numbers",
abstract = "Vertical Axis Wind Turbines have yet to see wide-spread use as a means of harvesting the kinetic energy of the wind. This may be due in part to the difficulty in modeling the relatively complex flow field and hence performance of these units. Additionally, similar to Horizontal Axis Wind Turbines, VAWTs are difficult to properly test in a conventional wind tunnel. Typically Reynolds numbers cannot be matched or the turbine geometry must be altered, limiting the applicability of the results. Presented in the following is a set of experiments in a specialized, high-pressure wind tunnel used to achieve high Reynolds numbers with a small-scale model. The performance change of this model is investigated at two different solidities and over nearly a decade of Reynolds numbers (based on diameter: 600, 000 ≤ ReD ≤ 5 × 106). The non- dimensional power coefficient displays behavior consistent with Reynolds number invariance, regardless of solidity. In addition, the change in performance as this limit is approached also shows no direct dependence on the solidity for the VAWT geometry used in this study. The results of this work have direct application for modeling and simulation efforts concerning the performance of new VAWT designs.",
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Rotor solidity effects on the performance of vertical-axis wind turbines at high Reynolds numbers. / Miller, M. A.; Duvvuri, S.; Kelly, W. D.; Hultmark, M.

In: Journal of Physics: Conference Series, Vol. 1037, No. 5, 052015, 19.06.2018.

Research output: Contribution to journalConference article

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AU - Hultmark, M.

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AB - Vertical Axis Wind Turbines have yet to see wide-spread use as a means of harvesting the kinetic energy of the wind. This may be due in part to the difficulty in modeling the relatively complex flow field and hence performance of these units. Additionally, similar to Horizontal Axis Wind Turbines, VAWTs are difficult to properly test in a conventional wind tunnel. Typically Reynolds numbers cannot be matched or the turbine geometry must be altered, limiting the applicability of the results. Presented in the following is a set of experiments in a specialized, high-pressure wind tunnel used to achieve high Reynolds numbers with a small-scale model. The performance change of this model is investigated at two different solidities and over nearly a decade of Reynolds numbers (based on diameter: 600, 000 ≤ ReD ≤ 5 × 106). The non- dimensional power coefficient displays behavior consistent with Reynolds number invariance, regardless of solidity. In addition, the change in performance as this limit is approached also shows no direct dependence on the solidity for the VAWT geometry used in this study. The results of this work have direct application for modeling and simulation efforts concerning the performance of new VAWT designs.

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