C05 - Aerofoil Pressure Distribution

Question 1

The magnitude and direction of the Total Reaction depend on what two factors?

Answer 1

• The pressure distribution created around the aerofoil.

- The overall area of the aerofoil.

Question 2

Name three other factors which affect the magnitude and shape of pressure distribution of an aerofoil?

Answer 2

• Speed of the flow.
• Angle of Attack.
• Camber.

Question 3

Define Angle of Attack?

Answer 3

The angle between the Chord Line and the Relative Air Flow.

Question 4

Define Camber?

Answer 4

The distance between the Mean Camber Line and the Chord Line

Question 5

True or False. Unequal pressure distribution can be created through Angle of Attack?

Answer 5

True.

Question 6

True or False. Increase an aerofoil’s camber can produce an unequal pressure distribution?

Answer 6

True.

Question 7

On a Cambered aerofoil, increasing the Angle of Attack increases the magnitude of the Total Reaction. What happens to the Centre of Pressure?

Answer 7

Moves forwards.

Question 8

On a Symmetrical aerofoil, increasing the Angle of Attack increases the magnitude of the Total Reaction. What happens to the Centre of Pressure?

Answer 8

Does not move.

Question 9

The pattern of pressure distribution determines the position of the Centre of Pressure. What two factors affect this?

Answer 9

• Angle of Attack.

- Camber.

Question 10

True or False. The magnitude of the pressure changes varies with the speed of airflow? Therefore, the greater the speed the lower the pressure change (2)?

Answer 10

• True.

- Greater the pressure change.

Question 11

True or False. The Centre of Pressure is affected by the airflow speed?

Answer 11

False.