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Me150 > Gas Turbine > Flashcards

Gas Turbine Flashcards

1
Q

What is working fluid

A

Any gas or liquid that can do work by expansion or flow or compression

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2
Q

What is a turbine

A

A bladed spool designed to rotate, when working fluid acts on it

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3
Q

Define what a compressor is

A

A bladed spool designed to do work on a fluid when it is rotated

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4
Q

Function of a gas turbine

A

Convert heat energy into rotary motion

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5
Q

Type 45 propulsion configuration (iep)

A

Integrated electric propulsion

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6
Q

Type 23 propulsion configuration CODLAG

A

Combination of diesel electric and gas

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7
Q

Positives is gas turbine

A 
Quick start 
High power to weight 
Low maintenance 
Low man power 
Remotely controlled
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8
Q

Air intake filters stages ?

A

1-spray eliminator
2-knit mesh filter
3-water Separation

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9
Q

What does the spitter silencer do

A

Straighten out air flow and reduce air noise

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10
Q

What does the stone guard do

A

Prevents large particles entertaining the turbine

Usually in maintenance periods

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11
Q

What are transition ducts

A

Provides smooth change from square cross section to circle for gas turbine

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12
Q

What do cascade bends do

A

Smoothly direct air through a 90 degree turn

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13
Q

What is the engine intake flare

A

A seal which connects the gas turbine to the air intake

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14
Q

What can the water wash ring do

A

It has holes to allow water into the gas turbine to clean the turbines

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15
Q

What is the purpose of smoothing air Flow

A

To emotive efficiency of the gas turbine

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16
Q

What are the two purposes of the module ventilation system

A

Get rid of oxygen supply in even of a fire

To allow air flow to cool gas turbine

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17
Q

What theorem is used to creat air flow

A

Bernoullis theorem

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18
Q

What is Bernoullis theorem

A

As a substance velocity increases the pressure decreases

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19
Q

Explain the module ventilation system

A
  • Air drawn in, due to the a depression formed at the other end.
  • air circulates around module
  • rushing exhaust gasses create depression, making flow in the system
20
Q

Five stages of a gas turbine

A 
Induction 
Compression 
Combustion 
Power
Exhaust
21
Q

3 times of air in power chamber

A

Primary air
Secondary air
Tertiary air

22
Q

What compression rate will the compressors change the air to

A

19:1

23
Q

Role of the primary air

A

All used for combustion

24
Q

Role Of secondary air

A

Ensure complete combustion

Provides a layer of air between can and fire to prevent over hearting

25
Q

Role of tertiary air

A

Becomes working fluid (used for thrust)

26
Q

What is the use of the LP and HP turbines

A

They drive a shaft due to the thrust produced and turn the compressors.

  • LP solid shaft
  • HP hallow shaft
  • 1/3 of the energy produced used for this
27
Q

What does the power turbine do

A

The thrust drives a turbine on a shaft, which will drive a generator or the gearbox
-2/3 of the energy produced used for this

28
Q

What lub do the navy use

A

OX22

29
Q

What do mag chips do

A

Early failure detections

By ferrous debris sticking to it, indicating An issue

30
Q

How often are magchips checked

A

Everyone 24 hours

Never wipe of particles

31
Q

Safety devices on gas turbine

A
  • Hand trip
  • fire detectors
  • power turbine entry temperature
  • partial over speed
  • lp/hp governors
  • vibration monitors
  • power turbine over speed
  • safety interlocks
32
Q

Explain partial over speed

A

If propeller comes out the water this will limit fuel to the engine to prevent over speed

33
Q

What are the LP/HP governors

A

Controls speed of the compressors

34
Q

What does the Power turbine over speed do

A

If the turbine exceeds 110% of max speed engine shuts of

35
Q

Two hazards

A

Igniters abs noise

36
Q

How long must you leave the igniters

A

5 minutes

37
Q

When can you enter the engine module

A

Only at idle
Permission of meo
Ear defenders most be worn

38
Q

How do we put out fire in the module

A

Bcf or btm drench system

  • Always armed if engine running
  • always disarmed if someone in module
39
Q

Hourly checks when watch keeping

A

Pressure and temperature
Oil level
Noises
Leaks

40
Q

Explain how a wet motor cycle is done

A

1The start motor is used to spin the engine
-Fuel supply is on but igniters are turned of
-

41
Q

When is a wet motor cycle done

A
  • Prove the fuel system after maintenance

- bleed any air from fuel system

42
Q

Explain a dry motor cycle

A

Engine turned by start motor
Fuel is of
Igniters are of

43
Q

Why is a dry motor cycle done

A

Purge fuel and water from combustion chamber

  • After a failed motor start
  • After a wet motor cycle
  • To enable water washing
44
Q

Why do we do water washing

A

Clean turbines for efficacy

And compressor blades

45
Q

What is inhibiting

A

A process carried out when ship is along side for a long period.
PX24 Sprayed in engine to prevent corrosion

Me150 (6 decks)

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