M1 Wind tunnel Theory - Part 1

What is the primary difference between open circuit and closed circuit wind tunnels?

• Air is recirculated in a closed circuit tunnel

• Air is recirculated in an open circuit tunnel

• Power consumption is lower in open circuit tunnels

• Closed circuit tunnels cannot operate at low speed

Which of the following is an advantage of an open circuit wind tunnel?

• Lower energy consumption

• Easier control of airflow

• Simpler design and construction

• Less aerodynamic noise

A closed-circuit wind tunnel is characterized by:

• Air entering from outside and exiting to the atmosphere

• Recirculating air inside the tunnel

• Using separate compressors for air movement

• Higher operational costs than open circuit tunnels

One of the main disadvantages of closed-circuit wind tunnels is:

• Higher power consumption

• Requirement of external air intake

• Potential for heat buildup in the airflow

• Inconsistent flow conditions

In low-speed wind tunnels, what is typically used to control the flow speed?

• Compressors

• Fans or blowers

• Shock waves

• Propellers

What is the main factor affecting the power requirement of a wind tunnel?

• The shape of the test section

• The air temperature

• The velocity of the airflow

• The weight of the wind tunnel

Power required for a wind tunnel is proportional to which factor?

• Air density squared

• Test section area squared

• Cube of the airflow velocity

• Inverse of the Reynolds number

In wind tunnels, power is consumed mainly to overcome:

• Temperature variations

• Flow separation

• Friction and pressure losses in the system

• Supersonic effects

Which formula can be used for estimating the power requirement of a wind tunnel?

• P = 1/2 ρ v^2 A

• P = 1/2 ρ A v^3

• P = 1/2 A v^3

• P = 1/2 ρ v^3

To minimize power consumption in wind tunnels, it is most effective to:

• Increase air density

• Reduce tunnel cross-sectional area

• Increase velocity

• Minimize frictional losses