3.5

Relate properties of fluids to the drag force on bodies in flow

fields.

1. Explain what is meant by skin friction drag and explain how this

can be reduced for a body.

2. Explain what is meant by pressure drag.

3. Explain what interference drag is and suggest a way in which it

could be measured.

4. Describe how lift induced drag is generated.

5. Calculate the induced drag experienced by an aircraft that is in

level flight (flying at constant altitude) If the mass of the aircraft

is 250000kg, the wingspan is 60m, the density of air at the

cruising altitude is 0.7km and the true airspeed of the aircraft

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Saipem Classification - General Use

Fluid Mechanics Level 5

is 210m/s.

ileam Engineering