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Gas Turbines > GT > Flashcards

GT Flashcards

1
Q

thermodynamic combustion cycle

Name the 4 part process cycle of the OTTO cycle

A
  • Isentropic compression
  • Heat addition
  • Isentropic expansion
  • Exhaust
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2
Q

What is the compression cycle of an engine called?

A

Brayton cycle it is a continous flow engine

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3
Q

Name the 2 types of gas turbines

A
  • Axial (expensive)
  • Centrifugal (Cheap)
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4
Q

What is the good about the gas turbine?

A
  • Cheap to run
  • High power
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5
Q

What are the operating considerations of a GT?

A
  • Fuel economy
  • Engine hour economy
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6
Q

What are the requirements of a compressor?

A
  • Large amount of air
  • Efficient
  • Stable
  • Compact
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7
Q

What is the difference between Axial & Centrifugal compressors?

A
  • Centrifugal changes air direction
  • Axial smaller
  • Centrifugal easier to fix
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8
Q

How does an axial compressor work?

A

Draws air in along a torturous path through rotating blades to increase pressure.

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9
Q

Name 3 types of compressor blades

A
  1. Solid root
  2. Fir tree root
  3. Dovetail Root
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10
Q

Name 3 types of seals on the lub oil system

A
  1. Lip
  2. Mechanical
  3. Labrinth
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11
Q

Change unit

In the CU oil system the most common elements for lubrication are?

A
  • Bearings
  • Pumps
  • Filters
  • Coolers
  • Tanks
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12
Q

Name 3 uses of air bleeds.

A
  1. Cooling
  2. Sealing
  3. Bearing mist lub
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13
Q

What does air bleed do?

A

Directs air to maintain optimum engine temp

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14
Q

Name 2 uses for the High pressure shut off cock (HPSOC)

A
  1. Shut off fuel
  2. Recirc fuel
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15
Q

Types of combustion chambers

What are the 3 methods of combustion in Gas turbines?

A
  1. Can-annular
  2. Annular
  3. Radial
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16
Q

Name the requirements for a combustion chamber

A
  • Efficient
  • Easy ignition
  • Clean exhaust
  • Stable temp
17
Q

Fuel injector

What is the purpose of the Burner?

A

Deliver atomised fuel to combustion chamber

18
Q

How is a GT started?

A

A HV spark igniter

19
Q

Describe High energy ignition unit

A

Mounted on the module & convert LV DC to HV

20
Q

Describe the Turbine design layout

A
  • LP & HP casings made from titanium
  • Nozzle guide vanes direct high temps
  • HP turbine drives the HP compressor
21
Q

What do Splitter/silencers do?

A
  • Reduces noise
  • Reduces turbulance
22
Q

Name the 4 types of fire supressant used

Under control of MEO1 ,key switch box local to module

A
  1. Halon
  2. 1301 BTM
  3. CO2
  4. Water mist/nitrogen
23
Q

Why are GT cleaned?

A
  • Remove Corrosive deposits
  • Extend life
24
Q

Describe 2 types of borescope

A
  • Rigid-Allows access to remote areas in straight line
  • Flexible-Use fibre optics

Gas Turbines (1 decks)

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