402 円柱ブレードを用いた風車における遠心吐出の効果(新エネルギー(1))

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This paper presents a study about an unusual horizontal axle wind turbine (HAWT). The shape of each blade is cylindrical. It obtains lift by forced boundary layer control, so this HAWT rotates. However, it does not have enough efficiency. One reason for this the study is still in an early stage of investigation. Therefore, as part of the improvement of its efficiency, this study tests a particular mechanism called "Centrifugal Vent (CV)". It is focused on not performance of the air foil, but rotation of the wind turbine. When the blades are hollow, the air at the tips of the rotating blades is pressured by centrifugal force. Therefore, this mechanism has a hole in each blade to vent out the air counter to the direction of lift in order to add momentum to rotation. As a result, wind tunnel tests show that CV improves torque as the numbers of rotations grow, and with that, power coefficient is up to double in this wind turbine. These effects vary by the method of intake air or the size of vent hole.
2009-07-08