turbine

Question 1

what’s the hottest air to metal contact point in the engine?

Answer 1

Nozzle guide vanes (NGV)

Question 2

what’s the purpose of nozzle guide vanes?

Answer 2

to guide airflow to the turbine section efficently

Question 3

why are turbines coated in ceramic?

Answer 3

to stop them from melting

Question 4

what is the main purpose of the turbine section?

Answer 4

take kinetic energy from moving gasses to drive the compressor and engine accessory gear box

Question 5

what’s the difference between turbine blades and compressor blades?

Answer 5

turbine blades need to be cooled and are fitted to a turbine, compressor blades don’t need to be cooled and are fitted to a compressor… turbine blades are normally air cooled

Question 6

what is the difference between the turbine on a turbojet compared to the turbine on a turboprop or turboshaft?

Answer 6

turbojet turbine extracts less air from the engine because more air needs to go out the exhaust so it goes faster

Question 7

how are turbine blades commonly attached to turbine disks?

Answer 7

fir tree root and dovetail