15.17 Turboshaft Engines Flashcards
What type of turbines do turbo shaft engines use?
Free power turbines.
What is turbo shaft engine output measured in?
Shaft horsepower (SHP)
What are the 2 sections of a turbo shaft engine?
Power and gas generator.
Where is a turbo shaft engine used?
To sustain high power output.
APU,
Helicopters.
What is a relevant turboshaft engine?
Ariel 2C engine
How does an Ariel 2C engine reduce engine RPM?
A power turbine drives a reduction turbine connected to a main gearbox.
In a helicopter what does the turboshaft engine do?
Drives main rotor gearbox.
In a APU, what does the turboshaft engine do?
Drives the electrical generator.
What does a twin pack engine have to prevent 1 engine from driving the other?
A freewheel which disconnects the slower engine.
What is the form of the twin pack freewheel?
Sprag clutch
What is the purpose of the universal joint?
Aligns engine and drive shaft.
Absorbs low amplitude oscillations.
Opposes torque reaction.
What is the purpose of the main rotor gearbox?
Further reduces rotor speed.
What do couplings allow for?
Movement of transmission
How are couplings designed?
Fail safe.
What is the purpose of the control system?
Adjusts engine fuel flow without exceeding engine RPM and TIT limitations.
