Unit 2 Aerodynamics Turboprop/turbo fan Propulsion Flashcards
Most of the turboprop engine’s power is used to…
Drive a propeller
The propeller aerodynamics of a turbo prop include:
- Each blade has an airfoil
- Blade acts like a wing
- Differential PSI between the front and rear surfaces
- That differential PSI pushes the A/C forward, producing thrust
What does the differential PSI between the front and rear surfaces of the propeller of a turbo prop do?
Pushes the A/C forward, producing thrust
The difference between the geometric pitch of the propeller and its effective pitch
Propeller slip
The distance a propeller would advance (theoretical)
Geometric pitch
The distance the propeller actually advances(actual)
Effective pitch
Blade angle is . . .
Angle between the blade chord and the plane of the propeller’s rotation.
What is Propeller Thrust?
The result of the shape and angle of the prop blade.
Thrust=
80% of torque
How much torque is lost to friction?
20%
Adjusting the blade angle =
Adjusting the load on the prop to control engine torque.
What is Shaft Horsepower?
Turboprop is rated by the amount of shaft horsepower it applies to the prop. The extension shaft allows you to measure shaft horse power with a torque meter.
What is the first component in the turbofan engine?
The fan
The Compressor rotor assembly includes:
Compressor assembly, Rotor shaft, and Turbine wheel assembly.
Components of the combustion section?
Combustion chambers, fuel spray nozzles, fuel manifolds, and igniter plugs.
