contestada

A 1/4th scale car is to be tested in a wind tunnel. If the full scale speed of the car is 30m/s, what should be the wind tunnel speed for Reynolds number similarity a) 30m/s b) 6m/s c) 7.5m/s d) 150m/s e) 120m/s

Respuesta :

Answer:

e)v=120 m/s

Explanation:

Given that

Scale ratio = 1/4

Speed of car =30 m/s

lets wind tunnel speed is v

We know that Reynolds number given as

[tex]Re=\dfrac{\rho\ L\ V}{\mu }[/tex]

If all conditions taken as similar then

[tex](L\ V)_c=(L\ V)_w[/tex]

Given that

[tex]\dfrac{L_w}{L_c}=\dfrac{1}{4}[/tex]

So we can say that

4 x 30 = v x 1

v=120 m/s

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