Accessory Drive/Gearbox Assembly

T4

T3T3

T2T2

n 1n 1 =400 rpm =400 rpm

n 4n 4 =2000 rpm =2000 rpm

T1T1 =100 teeth =100 teeth

Find T4

Gears LawGears Law

If T = No. of Gear Teeth

nRPM of Gear =

If T = No. of Gear Teeth

n = RPM of Gear

T1T1

==n 1n 1

n 4n 4

T4T4

T1T1

n 4n 4 =2000 rpm =2000 rpm

T4T4

T3T3

XX T3T3

T2T2

T2T2

T1T1

XX ==n3n3

n4n4

n2n2

n3n3

XX n1n1

n2n2

XX

T4T4

T3T3

n3n3

n4n4

==T3

T3

T2T2

n2n2

n3n3

== T2T2

T1T1

n1n1

n2n2

==

n 1n 1 =400 rpm =400 rpm

T1T1

=100 teeth =100 teeth

T4T4 ==

400400

20002000100100 XX == 20 Teeth 20 Teeth

T4T4 ==

n1n1

T1T1 XX

n4n4

Main Lube oilAC. Lube oilDC. Lube oil

6

LUBE OIL SYSTEM

LUBE OIL SYSTEM

Gear

Box

Gas Turbine

COMPRESSOR

7000 mm Above Machine C/L

Rundown Tank

Lube Supply Oil Header

To Lube Oil Reservoir

Starter Motor

HS.C

Lube Oil Drain HeaderTo Main Lube Oil Reservoir

Starter motor will be disconnected at about 65% of the max. operating speed

Turbine Shaft

Compressor Air

Air to cool the Turbine Blades

Cooling Air to the Turbine Blades

Combustion chamber

Atomizing airPrimary airSecondary air

Fuel

Atomizing air

Sealing airCooling air

Bleeding air

Combustion chamber Fuel

Atomizing air

Combustion chamber Fuel

Atomizing air

Three types of combustion chambers are used in gas turbines:

- Single combustion chamber- Annular combustor- Can annular combustor (several combustion chambers)

Types of Combustion Chambers

1.Single combustion chamber

2-Annular Combustor

The annular combustor's combustion chamber completely surroundsthe shaft.

Fuel nozzles are insertedinto the annular chamber at various points aroundthe chamber’s perimeter

Side view Axial view

Annular combustion chamber (annular combustor)

3-Multi - Can-Annular Combustor