problem 4 marks 2 0 the aerodynamic drag of a new sports car is to be
Problem 4 [Marks 2.0]
The aerodynamic drag of a new sports car is to be
predicted at a speed of 100 km/h at an air temperature of
25°C. Automotive engineers build a 1:2 scale model of the
car to test in a wind tunnel. The temperature of the wind
tunnel air is also 25°C. The drag force is measured with a
drag balance, and the moving belt is used to simulate the
moving ground (from the car's frame of reference). The
aerodynamic drag on the model in the wind tunnel is
measured to be 200 N. Determine:
Wind tunnel test section
1) How fast (in km/h) the engineers should run the wind tunnel to achieve similarity
between the model and the prototype.
2) The aerodynamic drag force (in N) on the prototype car if the drag force on the model
is measured to be 200 N when the wind tunnel is operated at the speed that ensures
similarity with the prototype car.
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