What does the fan do in a wind tunnel?

What does the fan do in a wind tunnel?

The air inside the tunnel is made to move by the fan on the far side of the tunnel. In this figure, air moves counter-clockwise around the circuit. The fan is turned by a large, electrically-powered drive motor. Leaving the fan, the air is turned in the corners by turning vanes.

What are the losses in supersonic tunnel?

The reason is that tremendous energy losses occur in the shock waves immediately downstream from the test section, where the mainstream air decelerates from supersonic to subsonic speeds. These shock-wave energy losses are inherent in all supersonic flow.

How many fans did NASA designers use to simulate a wind tunnel?

Air is driven through these test sections by six 15-bladed fans.

What causes a wind tunnel?

The wind tunnel effect happens when wind encounters a tall rectangular building. After the wind hits the building, it changes direction. The wind speed can double around the corners,” Chen said. The wind tunnel effect can be felt flowing between two tall buildings as well, as is the case with the two residence halls.

What are the 5 parts of a wind tunnel?

Finally, you should know the five basic parts of the wind tunnel. From front to back, they are: The Settling Chamber, the Contraction Cone, the Test Section, the Diffuser, and the Drive Section. (see Figure E).

How many throats are there in supersonic wind tunnel?

two throats
Explanation: In case of supersonic wind tunnels, there are two throats present. One is the nozzle throat where the sonic speed is achieved and the second throat is the diffuser throat where supersonic incoming flow is isentropically compressed to Mach 1.

Who invented supersonic wind tunnel?

3.2. A Swiss engineer, Jacob Ackeret, built from this concept the first supersonic wind tunnel in 1935 [11]. One can see in Fig. 9 a view of the Mach 2 nozzle in the S5Ch wind tunnel in ONERA Meudon, into operation since 1954.

How many turbines does the world’s largest wind tunnel have?

Its six turbines—40 feet wide, each powered by a 22,500-horsepower motor—can hit 180 rotations per minute, generating 110 mph winds in the tunnel and moving 60 tons of air every second.

What is the fastest wind tunnel?

Named the JF-22, the wind tunnel located in the Huairou District in northern Beijing would be able to simulate flights of up to 10 kilometers per second or 30 times the speed of sound, making it the fastest in the world.

What are the known differences between wind tunnel testing and actual flight test?

In an actual situation the roadway is moving relative to the vehicle but the air is stationary relative to the roadway, but in the wind tunnel the air is moving relative to the roadway, while the roadway is stationary relative to the test vehicle.

How does Mach number change through a supersonic wind tunnel design?

On the figure we note the changes in Mach number, velocity and pressure through a supersonic wind tunnel design. Notice that in both supersonic and subsonic designs, the velocity is increased and the pressure is decresed relative to the station upstream of the test section.

What is the difference between a subsonic and supersonic wind tunnel?

In a subsonic tunnel the area is contracting into the test section; in a supersonic tunnel the area is increasing. The physical reason for this seeming contradiction is given on the wind tunnel theory web page of the Beginner’s Guide to Compressible Aerodynamics.

How does the fan move the air inside the tunnel?

The air inside the tunnel is made to move by the fan on the far side of the tunnel. In this figure, air moves counter-clockwise around the circuit. The fan is turned by a large, electrically-powered drive motor. Leaving the fan, the air is turned in the corners by turning vanes.

How high can a plane fly in a subsonic tunnel?

This subsonic tunnel, which can test planes with wing spans of up to 100 feet, is over 1,400 feet long and 180 feet high. It has two test sections: one 80 feet high and 120 feet wide, the other 40 feet high and 80 feet wide. Air is driven through these test sections by six 15-bladed fans.