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Spectral characteristics of turbulent boundary layers – comparison of Particle Image Velocimetry and Thermal Anemometry

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Figure

Fig. 1. Wind tunnel with roughness elements (setup M4) and position of the laser sheet
Table 1. Properties of the boundary layers.
Fig. 3. Dependence of the power spectral density on the surface roughness, HW data, Uδ=10m/s, z/δ=0.33 (left); dependence on the free stream velocity, HW data, setup M3, z/δ=0.33 (middle), comparison of the spectral curves for HW, PIVS and PIVD methods set
Fig. 4. Spectral curves for all setups, all free stream velocities, and both measurement method (HW thin solid line, PIVD bold solid line, PIVS dashed line) at the height z=0.33δ in dimensional representation (left) and dimensionless form (right)

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