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GTE > IG > Flashcards

IG Flashcards

1
Q

Theory of reciprocating engine

A

Suck squeeze bang blow
Closed and intermittent
Otto cycle

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2
Q

Theory of GTE engine

A

Open and continous
Braytton cycle
Intake compression combustion exhaust

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3
Q

2 types of energy

A

Potential

Kinetic

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4
Q

Define potential energy

A

Enegery stored in an object due to thier form or position

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5
Q

Define kinetic energy

A

Energy in a object with motion

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6
Q

Outline conservation of energy

A

Energy can neither be created nor destroyed, it can only change forms

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7
Q

Measurement of power

A

Joules

P=W/t

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8
Q

Outline how heat effects matter

A

When matter is heated, the particles have more energy and move further apart

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9
Q

3 gas laws

A

Charles law
Boyles law
General gas law

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10
Q

Outline Charles law

A

Pressure constant.

When gas heated (temperature increase), volume increases

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11
Q

Outline Boyles law

A

Temp remains constant

Pressure decreases and volume of container increases

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12
Q

3 ways of heat transfer

A

Conduction -physical touch
Convection - fluid
Radiation - waves

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13
Q

Types of GTE

A

Turbine fan
Turboshaft
Turboprop
Turbojet

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14
Q

Factors effecting thrust

A 
Temperature
Altitude
Airspeed
Engine speed
Fan efficiency
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15
Q

Outline how temp effects thrust

A

Lower temp is more dense so more thrust can be produced

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16
Q

Altitude effects thrust

A

When altitude increases thrust decreases (less dense)

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17
Q

Airspeed effect thrust

A

Forward airspeed increases air mass acceleration in engine decreases which results in less thrust produced.
However
When forward airspeed increases more air is forced into engine. Known as ram effect and results in more pressure therefore more thrust produced

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18
Q

Engine speed effect thrust

A

At high engine speed a small increase in rpm will equal large increase kn thrust.

While low engine speed with a large increase of speed equals small increase in thrust

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19
Q

Fan efficiency effect thrust

A

Turbo fans can produce same thrust as turbojet but with less fuel required

20
Q

Function of inlet

A

Recover as much of the total pressure of the free airstream as possible and deliver it to the compressor

21
Q

Types of inlet [6]

A 
Bellmouth
Subsonic
Supersonic
Fuselage mounted
Wing mounted
Engine mounted inlets
22
Q

Compressor damage

A

Erosion

FOD

23
Q

Purpose of compressor

A

To increase pressure of airnin engine. More air forced in the more thrust can be produced

24
Q

2 ways to prevent fod in compressor

A

Inlet screen,

Vortex dissipater

25
Q

Inlet warning

A

Magnesium thorium, use appropriate ppe when filings or dust are present. They are radio active and must not be injested

26
Q

Compressor purpose

A

A device that raises the pressure of a working fluid passing through it

27
Q

Compressore shape

A

Convergent. To raise velocity

28
Q

Cuase of compressor stall

A

AOA to great

29
Q

Highest pressure in an engine

A

Diffuser

30
Q

Exit guide vanes from a compressor

A

Straighten and smooth the airflow into the diffuser and prepare it for combustion

31
Q

5 bleed air from diffuser

A 
Turbine cooling
Bearing seal pressurisation
Engine anti icing
Customer services
Pneumatic starting
32
Q

Outline Air for combustion

A

Primary air 25-35% used for combustion

Secondary air used for shaping and cooling

33
Q

Best fuel to air ratio

A

15:1

34
Q

Turbine components

A

Case
Stator
Shroud
Rotor

35
Q

Purpose of turbine

A

To extract sufficient kinetic energy from expanding gasses to drive the compressor and engine accessory gearbox

36
Q

Purpose shrouded turbine blades

A

Reduces vibration

Increases efficiency

37
Q

Where open ended turbine blades found

A

Higher rotational speed turbines

38
Q

Where shrouded turbine blades found

A

Used on slower rotational speed turbines

39
Q

2 types of turbine cooling

A

Convection/film

Transpiration - stationary blades only

40
Q

3 parts of exhaust section

A

Exhaust nozzle
Tailpipe
Exhaust cone

41
Q

Purpose of exhaust cone

A

Channel, collect and discharge gasses in a single jet

42
Q

Purpose of tail pipe

A

Directs exhaust gasses safely to exhaust nozzle

43
Q

Purpose of exhaust nozzle

A

Provide an extra boost in gas velocity, by its convergent shape

44
Q

What is compressor stall and when it occur

A

Inbalance between inlet velocity airflow and compressor rotational speed.

Occurs when AoA on compressor blade is too great

45
Q

Safety precautions for working on fire systems

A
  • Detectors must be clear of other components
  • Fire wire must not be crushed or damaged
  • Clip grommetsust not be crushed
  • Fire wire bend tolerances to be observed
46
Q

Purposes of compressor exit guide vanes

A

Last stage in compressor, and they remove the swirl from airflow prior to entering diffuser

47
Q

Why turbo prop more efficient at lower speed

A

Over 375mph aerodynamic drag and tip shock stall to great

GTE (5 decks)

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