Abstract
Subsonic wind tunnels are generally aerodynamic equipment allowing to obtain in one of their elements, namely in the experimental area where the model is placed, a uniform and stable airflow of determined speed. Wind tunnels of low subsonic speed, usually with continuous running, are plants where the air, driven by a fan, reach in the experimental area speeds up to 180 m/s (M <0,5). They look like tubes with (convergent - divergent) variable section. In our case the wind tunnel is a Prandtl type closed circuit in a horizontal plane, with a single return circuit and closed testing room. To reduce turbulence in the wind tunnel, the number of fan blades whose peripheral speed should not exceed 200 m/s should be as large as possible (which is the case of the INCAS subsonic wind tunnel with 12 blades). The present article is focused on the following topics: vertical and horizontal deflection and turbulence in the experimental area.
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