Abstract
The wind-tunnel test was conducted to investigate the structural characteristics of wind fields behind an inclined flat panel in turbulence logarithmic layer, which mimics a photovoltaic panel in the atmospheric surface layer. The active turbulence grid was installed at the front of the test section to generate the fully developed logarithmic layer downstream consists of a turbulent flow which has similar characteristics to the atmospheric surface layer. The tilt angle of the panel was set to 20 °; this angle is typical in real power stations and yields flow separations behind the panel. The time-series of velocity vectors measured with a dynamic PIV technique showed that the flow separations lead to two kinds of turbulence generation process: one is high-frequency fluctuations with the strong wind shear just below the separation bubbles and the other is low-frequency fluctuations with the flapping of the separation bubbles.
