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This paper presents the pointed tip effects on the aerodynamic load of NREL Phase VI wind blade rotor. The aerodynamic loads around flow field are evaluated using 3D CFD simulation. The commercial ANSYS Fluent and parameterized 3D cad models of NREL Phase VI are used for the analyses. The simple Spalart-Allmaras turbulence model and 0-degree yaw angle condition are adopted for CFD analysis. The pointed tip shape was made by reducing the original NREL chord length gradually near the tip region. To find out the 3D pointed tip effects on aerodynamic load, the pressure coefficient and integrated drag force and torque about primary axis are calculated. The numerical difference of Cp on wind blade surface between original and modified pointed tip models is negligible except near tip region, and also shown good agreement with experimental result in low wind speed case, however there is more deviation between the experimental data and CFD for high wind speed case, especially on the blade upper surface. Because the flow is highly unsteady, and the massive separation occurred due to the high angle of attack created by the higher wind speed while the rotational speed of the wind blade is kept constant for all cases.

Pointed Tip Shape Effect on Aerodynamic Load for NREL Phase VI Wind Turbine Blade