Abstract
The most important part of the wind turbine which effects to performance is wind turbine rotor blade. A deep understanding on the variables related to the rotor design is very important. The wind turbine blades are design based on two-dimensional flow around airfoil section. The flow around blade surface has effects on wind turbine blade sectional performance. The blade design is calculated by means of flow components in an axial and tangential directions. So, this research would like to study velocity field on airfoil section. The velocity field and velocity profile on two-dimensional direction are discussed. Flow around blade in three-dimensional direction is measured by Laser Doppler Velocimeter (LDV). From this study at optimum operation, the main flow has to part near the leading edge and pass along the upper airfoil surface. The resultant relative velocity Utd increases rapidly to around 3.5 times the main flow velocity, when flow has to pass along chord station of airfoil surface the velocity gradually decreases and reaches at the trailing edge. In the future, we would like to offer the new idea for making wind turbine blade which is included effects of span-wise flow direction between blade elements because the truth velocity consist of velocity in three-dimensional direction, In present wind turbine blade design is ignored the span-wise flow through pass airfoil along root to tip. Actually, span-wise flow effects to change boundary layer on wind turbine rotating blade which effect to wind turbine blade sectional performance.
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