Abstract
Wind tunnel is a device used to test aero models, automobiles and building structures. It is used to give appropriate shape to the structure. We calculated aerodynamic characteristics analytically for different models whereas wind tunnel can give practical values and we wanted to know how this can be designed. We decided to design an open circuit low speed subsonic suction type wind tunnel. Then, for a particular wind tunnel design the test section dimensions were defined according to the model size and air speed requirement. Parameters and dimensions at different sections were found by standardized equations like continuity and isentropic flow equations. We calculated boundary layer thickness of on the test section wall for designed velocity to check the impact of it on the flow in the test section of our designed wind tunnel. Also, we calculate the boundary layer thickness in different velocities to ensure that the flow over the testing object in test section is stable for all possible velocities.
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