Question

In: Mechanical Engineering

6A) The aerodynamic drag of a car, Fdrag, is a function of surrounding air density ρ...

6A) The aerodynamic drag of a car, Fdrag, is a function of surrounding air density ρ and viscosity μ, velocity of the car V, and length of the car L. Using ρ, V, and L as repeating variables, express this relationship in dimensionless form.

6B) The aerodynamic drag of a new sports car is to be predicted at a speed of 100 km/hr at an air temperature of 25°C. Automotive engineers build a one fifth scale model of the car to test in a wind tunnel. It is winter, and the wind tunnel is located in an unheated building; the temperature of the wind tunnel air is only about 5°C. Determine how fast the engineers should run the wind tunnel to achieve similarity between the model and the prototype.

(sorry my teacher not provide diagram)

Solutions

Expert Solution

Hence engineers should run wind tunnel with a speed of 442.54 km/hr to achieve dynamic similarity between prototype and model.

samet mamat answered 3 months ago
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