Study of Characteristics of Darrieus-type Straight-bladed Vertical Axis Wind Turbine by Use of Ailerons
| Autor: | Mitsuhiro Shiono, Kazuhisa Naoi, Katsuyuki Suzuki, Kentaro Tsuji |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Vertical axis wind turbine
Engineering Renewable Energy Sustainability and the Environment business.industry Energy Engineering and Power Technology Ocean Engineering Rotational speed Structural engineering Turbine Balanced rudder Wind speed law.invention Aileron law Torque business Simulation Water Science and Technology Wind tunnel |
| Zdroj: | Journal of Ocean and Wind Energy. 2 |
| ISSN: | 2310-3604 |
| DOI: | 10.17736/jowe.2015.mmr04 |
| Popis: | This paper presents a new starting assist method for Darrieus turbines using movable ailerons. To confirm the effect of the ailerons, we conducted wind tunnel tests to find the starting torque, starting wind speed, and load torque characteristics. The tested turbine has four blades, and the tested ailerons are fixed-angle and movable types. The movable ailerons increase the starting torque, thereby reducing the wind speed for startup. When a movable aileron is used, the load torque at low rotational speed is increased. Furthermore, the load torque of the turbine is roughly equal to the bare blade turbine at high rotational speed. 2007), and were found to provide more efficiency than symmetrical blades in water channel tests (Kihoh and Shiono, 1992). To investigate how the WT characteristics were changed by the ailerons, the ailerons were initially mounted at a fixed angle (fixed- aileron blades), and this arrangement was observed for the effect of the ailerons on the starting torque of the WT. The fixed-aileron blade experiment showed that the starting torque is increased in some of the position angles and decreased in other position angles, but the mean starting torque is not greatly increased. Therefore, we propose movable ailerons that are equipped with an extension- retraction mechanism. A wind tunnel experiment showed that movable ailerons increase the starting torque of the WT and that the wind speed needed for startup is decreased. Self-starting is not the only important feature of a WT; load characteristics are just as important. Therefore, the influence of the movable ailerons on load characteristics is also examined. Due to the effects of the fittings for controlling the angle of the movable aileron in the model constructed here, it was noted that at high rotational speed the ailerons reduce the WT output to below the power obtained in a model whose blades have no ailerons (bare blades). Therefore, a method is demonstrated for overcoming this. |
| Databáze: | OpenAIRE |
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