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La via Annia e le sue …, 2004
In this report a wind tunnel is described in term of its design, its construction as well as in i... more In this report a wind tunnel is described in term of its design, its construction as well as in its validation of flow features. This wind tunnel is characterized by a new unconventional design. The innovative design allows an unusual long flow test section (in particular important for turbulence research) relative to the total size of the wind tunnel. Thus, the new design enables a much better use of space in comparison to a wind tunnel with conventional design. The design is characterized by two strong expansions of flow, namely a wide angle diffusor and strong expanding corner. Among other things, investigations about these flow expanding components enlarge the existing knowledge and show new possibilities. 1 An Eifel type or linear wind tunnel is not a closed loop tunnel, it sucks in and blows out the air from the laboratory or the surrounding. However, since Göttingen and Eifel design have their pros and contras, the concept of wind tunnel construction has to be evaluated on the basis of requirements 2 Turbulence intensity is determined by the ratio between standard deviation of velocity and temporal mean velocity, T I = σ (u) u t 3 Air in ambient conditions (T ≈ 20 • C, p ≈ 1000 hPa) is the flow media of the present wind tunnel
La via Annia e le sue …, 2004
In this report a wind tunnel is described in term of its design, its construction as well as in i... more In this report a wind tunnel is described in term of its design, its construction as well as in its validation of flow features. This wind tunnel is characterized by a new unconventional design. The innovative design allows an unusual long flow test section (in particular important for turbulence research) relative to the total size of the wind tunnel. Thus, the new design enables a much better use of space in comparison to a wind tunnel with conventional design. The design is characterized by two strong expansions of flow, namely a wide angle diffusor and strong expanding corner. Among other things, investigations about these flow expanding components enlarge the existing knowledge and show new possibilities. 1 An Eifel type or linear wind tunnel is not a closed loop tunnel, it sucks in and blows out the air from the laboratory or the surrounding. However, since Göttingen and Eifel design have their pros and contras, the concept of wind tunnel construction has to be evaluated on the basis of requirements 2 Turbulence intensity is determined by the ratio between standard deviation of velocity and temporal mean velocity, T I = σ (u) u t 3 Air in ambient conditions (T ≈ 20 • C, p ≈ 1000 hPa) is the flow media of the present wind tunnel