Experimental and Numerical Study of a New Dynamic Phenomenon for Two-bladed Wind Turbines

Torben J. Larsen; Taeseong Kim

Experimental and Numerical Study of a New Dynamic Phenomenon for Two-bladed Wind Turbines

Torben J. Larsen, Taeseong Kim

Department of Wind Energy

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Abstract

In this paper the dynamics of a two-bladed turbine is investigated numerically as well as experimentally with respect to how the turbine frequencies change with the rotor speed. It is shown how the turbine frequencies of a two-bladed rotor change with the azimuthal position at standstill and how the frequencies start whirling during rotor rotation. The whirling for two-bladed rotors change with multiple P contributions and not only ±1P as is previously seen for three-bladed wind turbine rotors. A three-bladed turbine was also analyzed in similar way and results were compared. This turbine was investigated both in a perfect isotropic condition where all blades have identical properties as well as an imbalanced edition where one blade had increased mass.

Original language	English
Journal	Proceedings of the International Offshore and Polar Engineering Conference
Volume	2015-1
Pages (from-to)	547-553
ISSN	1098-6189
Publication status	Published - 2015
Event	25th International Ocean and Polar Engineering Conference - Kona, United States Duration: 21 Jun 2015 → 26 Jun 2015 http://www.isope.org/conferences/conferences.htm

Conference

Conference	25th International Ocean and Polar Engineering Conference
Country/Territory	United States
City	Kona
Period	21/06/2015 → 26/06/2015
Internet address	http://www.isope.org/conferences/conferences.htm

Keywords

Wind turbine
Dynamics
Experiment
Imbalanced rotor
Campbell
Whirling
Two blades
Three blades

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@inproceedings{eced6e9d07a243f3a55805eb1b9a44da,

title = "Experimental and Numerical Study of a New Dynamic Phenomenon for Two-bladed Wind Turbines",

abstract = "In this paper the dynamics of a two-bladed turbine is investigated numerically as well as experimentally with respect to how the turbine frequencies change with the rotor speed. It is shown how the turbine frequencies of a two-bladed rotor change with the azimuthal position at standstill and how the frequencies start whirling during rotor rotation. The whirling for two-bladed rotors change with multiple P contributions and not only ±1P as is previously seen for three-bladed wind turbine rotors. A three-bladed turbine was also analyzed in similar way and results were compared. This turbine was investigated both in a perfect isotropic condition where all blades have identical properties as well as an imbalanced edition where one blade had increased mass.",

keywords = "Wind turbine, Dynamics, Experiment, Imbalanced rotor, Campbell, Whirling, Two blades, Three blades",

author = "Larsen, {Torben J.} and Taeseong Kim",

year = "2015",

language = "English",

volume = "2015-1",

pages = "547--553",

journal = "Proceedings of the International Offshore and Polar Engineering Conference",

issn = "1098-6189",

publisher = "International Society of Offshore and Polar Engineers",

note = "25th International Ocean and Polar Engineering Conference, ISOPE-2015 ; Conference date: 21-06-2015 Through 26-06-2015",

url = "http://www.isope.org/conferences/conferences.htm",

}

TY - GEN

T1 - Experimental and Numerical Study of a New Dynamic Phenomenon for Two-bladed Wind Turbines

AU - Larsen, Torben J.

AU - Kim, Taeseong

PY - 2015

Y1 - 2015

N2 - In this paper the dynamics of a two-bladed turbine is investigated numerically as well as experimentally with respect to how the turbine frequencies change with the rotor speed. It is shown how the turbine frequencies of a two-bladed rotor change with the azimuthal position at standstill and how the frequencies start whirling during rotor rotation. The whirling for two-bladed rotors change with multiple P contributions and not only ±1P as is previously seen for three-bladed wind turbine rotors. A three-bladed turbine was also analyzed in similar way and results were compared. This turbine was investigated both in a perfect isotropic condition where all blades have identical properties as well as an imbalanced edition where one blade had increased mass.

AB - In this paper the dynamics of a two-bladed turbine is investigated numerically as well as experimentally with respect to how the turbine frequencies change with the rotor speed. It is shown how the turbine frequencies of a two-bladed rotor change with the azimuthal position at standstill and how the frequencies start whirling during rotor rotation. The whirling for two-bladed rotors change with multiple P contributions and not only ±1P as is previously seen for three-bladed wind turbine rotors. A three-bladed turbine was also analyzed in similar way and results were compared. This turbine was investigated both in a perfect isotropic condition where all blades have identical properties as well as an imbalanced edition where one blade had increased mass.

KW - Wind turbine

KW - Dynamics

KW - Experiment

KW - Imbalanced rotor

KW - Campbell

KW - Whirling

KW - Two blades

KW - Three blades

M3 - Conference article

VL - 2015-1

SP - 547

EP - 553

JO - Proceedings of the International Offshore and Polar Engineering Conference

JF - Proceedings of the International Offshore and Polar Engineering Conference

SN - 1098-6189

T2 - 25th International Ocean and Polar Engineering Conference

Y2 - 21 June 2015 through 26 June 2015

ER -

Experimental and Numerical Study of a New Dynamic Phenomenon for Two-bladed Wind Turbines

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Conference

Keywords

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