Module 15.1 Fundamentals Flashcards

1
Q

What is the name of the thermodynamic cycle that engine uses to produce thrust?

A

Brayton cycle

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2
Q

What are the 4 stages of the Brayton cycle?

A

Intake - Suck
Compression - Squeeze
Expansion - Bang
Exhaust - Blow

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3
Q

What are the 4 changes of state in Gas Turbine Engines (GTE)?

A
  • Isobaric
  • Isochoric
  • Isothermal
  • Isentropic
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4
Q

What is the main purpose of the compressor?

A

Increase static pressure

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5
Q

What are the 4 types of gas turbine engine?

A
  • Turbojet
  • Turbofan
  • Turboprop
  • Turboshaft
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6
Q

What are the equations for:
PE?
KE?

A

PE - mgh
KE - 1/2 mv^2

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7
Q

What are the advantages of turbojet?

A
  • Simple design
  • Limited space
  • Very high speeds
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8
Q

What are the disadvantages of turbojet?

A
  • Very loud
  • High fuel consumption
  • Poor performance at low speed
    -Limited in range and endurance
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9
Q

What type of engine is a GTE?

A

Heat engine

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10
Q

What is isobaric heating?

A

Volume increase, pressure constant. In the combustion chamber

On diagram of the Brayton cycle it is between 2 and 3

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11
Q

What part of the engine has the highest static pressure?

A

Combustion chamber inlet, exit guide vanes

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12
Q

What is the hottest part of the engine?

A

Combustion chamber outlet/ 1st nozzle guide vane

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13
Q

What is isentropic compression?

A

Pressure increase and volume decrease

On diagram of the Brayton cycle it is between 0 and 2

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14
Q

What is the working fluid in a GTE?

A

Air

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15
Q

What is the equation for power?

A

Power = Work/ Time (watts)

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16
Q

What is the equation for work?

A

Work = Force x Distance (J)

17
Q

What is the difference between speed and velocity?

A

Velocity has a direction

18
Q

What is the difference between turboprop and turbojet?

A

Prop has:
- More turbines
- Power shaft
- Reduction gearbox to drive propeller

19
Q

What is the difference between turbojet and turbofan?

A

Turbofan - Set of or a large fan driven by turbine

20
Q

What is a spool?

A

Turbine driving a compressor two or three spool in a turbofan

21
Q

What does exhaust gas drive in a turboshaft engine?

A

Free turbine which is connected to a power shaft

22
Q

What does the cold section of an engine refer to?

A

Parts of the engine from the inlet up through the compressor and/or diffusers

23
Q

What drives the compressor?

A

The turbine

24
Q

What type of construction are GTE?

A

Modular

25
Q

In a turbofan engine what produces most of the thrust?

A

The fan (80%)

26
Q

What speed range are turbojets best suited to?

A

Supersonic

Very inefficient at low speeds

27
Q

What happens to piston engines with altitude?

A

Performance drops

28
Q

What is newtons first law about?

A

Inertia

An object at rest will stay at rest ….

29
Q

What is potential energy?

A

The energy that an object has as a virtue of its position

30
Q

What is the hot section of an engine?

A

Areas from the combustion chamber and through the exhaust

31
Q

What drives the low pressure compressor?

A

Low pressure turbine

32
Q

The number of compressors is dependant on what?

A

The number of spools

33
Q

how are spools connected?

A

Aerodynamically

34
Q

Turboprop engines are specifically designed to produce what?

A

Shaft horsepower

35
Q

What is inside the gas generator?

A

Compressor, combustion and turbine