Exercise 2.

Exercise 1.

Exercise 3.Use one term from each category in Ex.1 to complete the sentences below. Look at A, B and C to help you.

1. The widening zone of turbulent air behind a fast-moving vehicle is called the _______.

2. In very strong winds, the low pressure generated just above the sheltered sides of the roffs of buildings generates _______, which can cause the roof to ‘explode’ outwards due to the higher-pressure air inside the building.

3. The aerodynamic effectiveness of designs can be rested in a _______.

4. On an aircraft fuselage, the heads of rivets are designed to be flat as possible in order to limit _______.

5. Most helicopters have either two or three main ________.

Exercise 4.Read the texts A, B, C, D and mark the sentences true (T) or false (F).

1. The branch of fluid dynamics concerned with airflow is called aeromechanics.

2. Aerodynamic tests can be done in wind tunnels – tunnels through which air is blown at low velocity.

3. CFD stands for computational fluid dynamics.

4. Aerodynamic drag is measured by Pascal.

5. The resistance of an object to an airflow is called drag.

6. Engineers call the air close to the surface as boundary layer.

7. A turbulent flow produces less drag than a laminar flow.

8. A twisting flow – like water going down the plughole in a bath- is known as a vortex.

9. Wings, blades are the components of aerofoil designed to make air flow in specific ways.

10. The behavior of air around an aerofoil doesn’t depend on the velocity of the airflow.

Exercise 5.Complete phrases about fluid dynamics with the correct prepositions.

1. Fluid dynamics is the study ___ how gases and liquids flow around objects.

2. The branch of fluid dynamics concerned ___ airflow.

3. Aerodynamic drag is measured ___ the drag coefficient.

4. The behavior of air around an airfoil depends ___ the angle of attack (or pitch) of the aerofoil.

5. Aerodynamic tests can be done in wind tunnels ___ high velocity.