The preliminary design of the wind tunnel model implies the selection of the geometry scale and the definition of the scaling method. Concerning the geometry scale, taking into account the maximum size available at the POLIMI's wind tunnel and the minimum model size requested by the call, the geometry scale has been frozen equal to 1:6. Two different scaling strategies have been investigated: constant Froude number and constant frequency. Despite the constant Froude number is the most common scaling strategy, it has been discarded in this case for two main reasons. At first, due to the vertical position of the wing, the gravity acts orthogonally to the plane of motion (plunge). Second, using the Froude scaling the scaled frequencies are equal to the real ones multiplied by the square root of the geometry scale factor. This requires an actuator bandwidth that is very difficult to reach for such a small scale so to be installed inside the wing model. For these reasons the iso-frequency scaling strategy has been identified as the most suitable in this case.
Powered by CMSimple | Template: ge-webdesign.de | Login
