Answer to Question #249837 in Mechanical Engineering for mauu

Question

1.2 For the purpose of turbine design, there is a need for aerodynamics test of the nose corn design in a wind tunnel. Suppose that the fluid enters the test section of a circular tunnel with a uniform speed of 50 m/s and it flows over a nose corn placed at the centreline of the tunnel, as shown in Fig. 1, the nose corn rotates at a constant speed w=10 rad/s about the centreline of the tunnel. Assume that the flow is laminar and fully developed before exits from the tailpipe, with the information given above, provide a set of governing equations and boundary conditions in its simplest form that can be used to determine the unique flow through the tunnel, in terms of fluid velocity and pressure distributions.

Answer 1

 TESTING PARAMETER

In wind tunnel testing, the real configurations such an aircraft and its components are usually scaled down to become the corresponding small size model that can be installed in test section of wind tunnel. In order to obtain similar flow condition in the wind tunnel as free flight at full scale, it requires more than just to ensure geometrical similarity of the model. One also has to take care that forces produced by flow are in the same relationship to each other.

 wind tunnel can be performed in term of:

i. Monitoring physical flow phenomenon such as laminar, tuberlent and separation flows, vortex and shock wave.

ii. Measuring aerodynamic quantities such as pressure, skin friction, lift, drag and moments.

.