Module 15.1 Fundamentals Flashcards
What is the name of the thermodynamic cycle that engine uses to produce thrust?
Brayton cycle
What are the 4 stages of the Brayton cycle?
Intake - Suck
Compression - Squeeze
Expansion - Bang
Exhaust - Blow
What are the 4 changes of state in Gas Turbine Engines (GTE)?
- Isobaric
- Isochoric
- Isothermal
- Isentropic
What is the main purpose of the compressor?
Increase static pressure
What are the 4 types of gas turbine engine?
- Turbojet
- Turbofan
- Turboprop
- Turboshaft
What are the equations for:
PE?
KE?
PE - mgh
KE - 1/2 mv^2
What are the advantages of turbojet?
- Simple design
- Limited space
- Very high speeds
What are the disadvantages of turbojet?
- Very loud
- High fuel consumption
- Poor performance at low speed
-Limited in range and endurance
What type of engine is a GTE?
Heat engine
What is isobaric heating?
Volume increase, pressure constant. In the combustion chamber
On diagram of the Brayton cycle it is between 2 and 3
What part of the engine has the highest static pressure?
Combustion chamber inlet, exit guide vanes
What is the hottest part of the engine?
Combustion chamber outlet/ 1st nozzle guide vane
What is isentropic compression?
Pressure increase and volume decrease
On diagram of the Brayton cycle it is between 0 and 2
What is the working fluid in a GTE?
Air
What is the equation for power?
Power = Work/ Time (watts)