Gas Turbine - Air Inlet

Question 1

Subsonic Pitot Inlet Must ensure

Answer 1

Engine receives correct quantity of air

Delivered to engine with minimal energy loss

Airflow is uniform and free of turbulence

Delivered at uniform pressure

Minimum drag

Question 2

Subsonic Inlet does what to cause rise in pressure

Answer 2

Uses RAM air effect to cause natural rise in pressure

Question 3

Inner surface of the inlet of a gas turbine is

Answer 3

Smoothed to minimise risk of turbulent flow

Question 4

How can you prevent instability and surging with a cross wind

Answer 4

Reduced risk by carrying out a rolling takeoff

Question 5

How is icing prevent on the inlet

Answer 5

The lip is heated with bleed air or oil from the engine to ensure the inlet is smooth

Anti iced using hot air from HP compressor

Question 6

What happens in the air inlet of a high bypass turbofan

Answer 6

Speed increases
Total pressure remains constant

Question 7

Throat role in inlet of gas turbine engine

Answer 7

Forms a slight convergent duct towards diffuser to suck air in

Question 8

Diffuser in the inlet of gas turbine

Answer 8

Divergent duct to generate an increase in pressure

Question 9

Pressure/velocity and temperature in the air inlet of turbofan engine

Answer 9

Pressure increase
Velocity decreases
Temp increases

Question 10

The intake is a

Answer 10

Divergent duct

Question 11

Engine oil reservoirs are located at the front of the engine

Answer 11

To allow the hot oil to heat the air intake

Also located at front for maintenance purposes and oil refilling