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In this study, tip injection is implemented on a model Horizontal Axis Wind Turbine (HAWT) rotor to investigate the power and thrust coefficient variations as well as the wake characteristics. The model wind turbine has a 0.95 m diameter 3-bladed rotor with non-linearly twisted and tapered blades that has NREL S826 profile. The nacelle, hub and the...
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Figure 2.10 shows the mean velocity and turbulence intensity at the jet centerline y , z 0 , 0 for different wind tunnel motor frequencies. Results shows that the maximum velocity that can be reached by the open jet wind tunnel is around 10 m/s, and the average turbulence intensity is around 2 %. In addition, measurements have been conducted at the exit plane of the open-jet wind tunnel in the y & z directions. Measurements have been conducted at two selected motor frequencies (25 Hz represented by the square symbols & 35 Hz represented by the triangle symbols). The data were acquired by traversing the hot-wire sensor along the y-axis and z-axis using 3-axis traverse system shown in Figure 2.11. Figure 2.12 and Figure 2.13 respectively present the mean axial velocity and turbulence intensities for the two selected motor frequencies. The results of the characterization show that the flow is quite uniform away from the walls and around the jet centerline. The boundary layer thicknesses are below 7 mm (0.4% D) and the turbulence levels are around ...
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