Test 3 (T1.7, T1.8)

The advantages of the closed wind tunnels versus open wind tunnels are:

• Lower energy consumption, lower construction cost, less noise

• Better flow control, lower construction cost, less noise

• Less noise, lower energy consumption, better flow control

• Less noise, less energy consumption, higger air speed

What are the existing flow visualization experimental systems in Road Testing:

• Pitot's pipes, wool tufts, liquid film and infrared camera

• Pitot's pipes, dust footpint, liquid film and infrared camera

• Wool tufts, dust footprint and liquid film

• Wool tufts, liquid film and smoke

What forces can be measured in a wind tunnel?

• Weight, drag, downforce and side draft

• Frictional drag, shape drag and lift

• Frictional drag, shape drag and downforce

• Drag, Lift and side draft

When mach number < 0.7 flow is in

• subsonic regime

• super sonic regime

• sonic regime

• hypersonic regime

If we make the mesh cells bigger, the accuracy of our CFD solution will usually:

• Decrease.

• Increase.

• Remain unchanged.