(Solved): 1. A typical open-type low-speed wind tunnel is shown above. The flow of air is induced by the prop ...

1. A typical open-type low-speed wind tunnel is shown above. The flow of air is induced by the propeller and electric motor at station 11.

a. Air enters from the room where the tunnel is located through inlet 1. The area of the duct is reduced by a factor of eight by the time the flow reaches the test section (4). If a static pressure port at station 4 measures a gauge pressure of - 0.0975 psi, what is the velocity at that station? Assume that the room is at standard sea level conditions and that the converging duct has no friction.

b. What is the air velocity at the tunnel’s inlet?

c. If the static pressure at one point on the surface of an airfoil placed in the test section is 7% lower than the tunnel's static pressure, what is the velocity of the air at that point?

d. What is the velocity of the air right before it goes through the propeller, if the duct area is 1.4 times the area of the test section?

e. What is the pressure of the air of question d?