Moment of Inertia Dependence of Vertical Axis Wind Turbines in Pulsating Winds
Vertical Axis Wind Turbines (VAWTs) are unaffected by changes in wind direction, and they have a simple structure and the potential for high efficiency due to their lift driving force. However, VAWTs are affected by changes in wind speed, owing to effects originating from the moment of inertia. In t...
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| Format: | Article |
| Language: | English |
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Wiley
2012-01-01
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| Series: | International Journal of Rotating Machinery |
| Online Access: | http://dx.doi.org/10.1155/2012/910940 |
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| _version_ | 1832551804963913728 |
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| author | Yutaka Hara Koichi Hara Tsutomu Hayashi |
| author_facet | Yutaka Hara Koichi Hara Tsutomu Hayashi |
| author_sort | Yutaka Hara |
| collection | DOAJ |
| description | Vertical Axis Wind Turbines (VAWTs) are unaffected by changes in wind direction, and they have a simple structure and the potential for high efficiency due to their lift driving force. However, VAWTs are affected by changes in wind speed, owing to effects originating from the moment of inertia. In this study, changes in the rotational speed of a small VAWT in pulsating wind, generated by an unsteady wind tunnel, are investigated by varying the wind cycle and amplitude parameters. It is shown that the responses observed experimentally agree with simulations based on torque characteristics obtained under steady rotational conditions. Additionally, a simple equation expressing the relationship between the rotational change width and amplitude of the pulsating wind is presented. The energy efficiency in a pulsating wind remains constant with changes in both the moment of inertia and the wind cycle; however, the energy efficiency decreases when the wind amplitude is large. |
| format | Article |
| id | doaj-art-5c36b0cb6557442fa484ebe41cfa67a1 |
| institution | Kabale University |
| issn | 1023-621X 1542-3034 |
| language | English |
| publishDate | 2012-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Rotating Machinery |
| spelling | doaj-art-5c36b0cb6557442fa484ebe41cfa67a12025-02-03T06:00:33ZengWileyInternational Journal of Rotating Machinery1023-621X1542-30342012-01-01201210.1155/2012/910940910940Moment of Inertia Dependence of Vertical Axis Wind Turbines in Pulsating WindsYutaka Hara0Koichi Hara1Tsutomu Hayashi2Department of Mechanical and Aerospace Engineering, Graduate School of Engineering, Tottori University, 4-101 Minami, Koyama-cho, Tottori 680-8552, JapanDepartment of Mechanical and Aerospace Engineering, Graduate School of Engineering, Tottori University, 4-101 Minami, Koyama-cho, Tottori 680-8552, JapanNagoya Industrial Science Research Institute, 306 Yuta, Obata-cho, Ise, Mie 519-0506, JapanVertical Axis Wind Turbines (VAWTs) are unaffected by changes in wind direction, and they have a simple structure and the potential for high efficiency due to their lift driving force. However, VAWTs are affected by changes in wind speed, owing to effects originating from the moment of inertia. In this study, changes in the rotational speed of a small VAWT in pulsating wind, generated by an unsteady wind tunnel, are investigated by varying the wind cycle and amplitude parameters. It is shown that the responses observed experimentally agree with simulations based on torque characteristics obtained under steady rotational conditions. Additionally, a simple equation expressing the relationship between the rotational change width and amplitude of the pulsating wind is presented. The energy efficiency in a pulsating wind remains constant with changes in both the moment of inertia and the wind cycle; however, the energy efficiency decreases when the wind amplitude is large.http://dx.doi.org/10.1155/2012/910940 |
| spellingShingle | Yutaka Hara Koichi Hara Tsutomu Hayashi Moment of Inertia Dependence of Vertical Axis Wind Turbines in Pulsating Winds International Journal of Rotating Machinery |
| title | Moment of Inertia Dependence of Vertical Axis Wind Turbines in Pulsating Winds |
| title_full | Moment of Inertia Dependence of Vertical Axis Wind Turbines in Pulsating Winds |
| title_fullStr | Moment of Inertia Dependence of Vertical Axis Wind Turbines in Pulsating Winds |
| title_full_unstemmed | Moment of Inertia Dependence of Vertical Axis Wind Turbines in Pulsating Winds |
| title_short | Moment of Inertia Dependence of Vertical Axis Wind Turbines in Pulsating Winds |
| title_sort | moment of inertia dependence of vertical axis wind turbines in pulsating winds |
| url | http://dx.doi.org/10.1155/2012/910940 |
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