Recently, wind energy is observed as the energy which the environmental load is little. Especially, smll-size wind turbine being used in urban district as a emergency electric power source, increases. However, the wing tip noise which accompanies with the high turning speed of the turbine is the problem which cannot be ignored. Then, in this dissertation for noise measurement, the low-noise wind tunnel is produced. And using this apparatus, occurrence circumstance of wing tip noise is considered on the basis of the flow visualization result. Finally, the attempt which decreases blade tip noise by using the tripping wire is described.
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