Abstract
In order to make a strong turbulence field in a wind tunnel, the properties of 3-D multi-scale turbulence grid using fractal was experimentally investigated. The intensity and scale of turbulence generated by the developed multi-scale turbulence grid were larger than that of the conventional grid turbulence. On the other hand, the turbulence Reynolds number of the developed grid was smaller than that of an active turbulence generator. Since the structures of suggested turbulence generator is simple compared to the active turbulence generator, it seems to be suitable application to generate large scale turbulence for an actual scale automotive wind tunnel.
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