Turbine Engines Flashcards
Pulsejet Air for Compressor
Check Valves
Purpose of Turbine in Gas Turbine Engine?
Turn Compressor
Main Advantage of Turbojet?
More Power + Fuel Efficient
Another name for Bypass Air?
Secondary Airflow
Most common gas turbine on corporate jets?
Medium Bypass
Another name for Free Turbine?
Power Turbine
Application of Turboshaft Engine?
APU/ Helicopter
If there are 2 compressors?
Double Spool
Relationship between Air Density and Thrust
Air Density is Directly Proportional to Thrust
Propulsive Efficiency?
Measure of effectiveness with which an engine converts kinetic energy into useful work
Gross Thrust
Total thrust produced without deduction of drag caused by momentum of incoming air
Newtons 1st Law?
Law of inertia
Newtons 2nd Law
Law of acceleration
Newtons 3rd Law
Every action has a equal and opposite reaction
Modular Engine Design?
Lower Maintenance Cost
Inlet duct design used on the Concorde
CD duct
Why are Vortex generators used on inlets
Smooths the air
Areas heated using Anti-Ice
Cowl
Inlet Guide Vanes
Nose Cone
Primary purpose of compressor?
Increase static pressure and Decrease Velocity
(single stage) Centrifugal Compressor Ratio?
10:1
Purpose of Diffusor
Increase static pressure and Decrease Velocity prior to combustion
Stage of axial flow compressors?
Rotors then Stators
Function of compressor stator
Increase pressure and direct airflow into the next rotor
Causes of compressor stall?
Turbulence
Quick Acceleration
Quick De-cceleration
Compressor wash?
fluid and grit blast
What did Frank Whittle Invent?
First Turbojet engine with a centrifugal impeller compressor
What compressor type is a turbojet aircraft engine?
Centrifugal
Another Name for Core Airflow?
Primary airflow
What does pt7 stand for?
Total air pressure at station 7 ( Dynamic )
What does a gearbox reduction do?
Keeps the tips subsonic
For prop efficiency
Powers the prop
What does a free turbine do?
Gas gen. section and Power section separate
Reduce noise + blade erosion
Lower vibration
Power gear box
Purpose of the Bellmouth inlet?
Helicopters and testing engines. Highest aerodynamic efficiency.
3 types of Inlet designs?
Subsonic(private + commercial)
Supersonic(concord)
Bellmouth(helicopters + testing)
Highest Potential Energy?
Diffuser
