Question

A model car is tested in a large wind tunnel at an airspeed of 200 km/h. The model is 0.8m long and is a geometrically similar ¼ scale model of the full-size prototype car. If a drag force of 1.2kN is measured on the model in the wind tunnel, estimate the power the full-size car would require to overcome the drag force when travelling at a speed of 50km/h

How would you describe the flow? Are similarity conditions met? Explain. Assume air density ρ = 1.2kg/m^3 and dynamic viscosityμ= 1.8x 10-5Pa.s. [Answer 16.7 kW]

Answer 1