Gas Turbines

Question 1

What does IEP STAND FOR

Answer 1

integrated electric propulsion

Question 2

What does (CODLAG) stand for

Answer 2

Combination of diesel electric and gas

Question 3

Advantages of gas turbines

Answer 3

• an abilitly to get underway quickly.
• ease of operation with the empahsis on remote control.
• high power/weight ratio.
• minimum shipboard maintenance.
• low manpower requirement.

Question 4

List all air intake components

Answer 4

• Air intake 3 stage filtration system.
• Stone guard
• transition duct
• cascade bend
• engine intake flare
• splitter/ silencer
• intake trunking

Question 5

All components to exhaust part

Answer 5

• module ventilation
• power turbine
• exhaust trunking

Question 6

What is the function of a gas turbine on board

Answer 6

To turn heat energy into rotary motion to provide propulsion.

Question 7

What type of gas turbine is fitted to a t23 and how many

Answer 7

Type 23’s use 2 spey turbines

Question 8

What is the purpose of the 3 stage air intake system

Answer 8

To provide clean debris free and water free air to the system

Question 9

What is step 1 of the 3 step air intake system?

Answer 9

Spray eliminator (encourages the air to let go of the water) aluminium fins change direction of air, catching the spray and causing the majority to drop off and mainly dry air passes through.

Question 10

What is step 2 of the 3 step air intake system?

Answer 10

Knitmesh filter ( aluminimum frame supporting woven material) removed particle matter

Question 11

What is step 3 of the 3 step air intake system?

Answer 11

The same as step 1 to ensure all water particles are gone

Question 12

What is the purpose of the splitter/silencer ?

Answer 12

To smother out the air an disperse turbulance

Question 13

What is the purpose of a stone guard

Answer 13

To catch any large debris

Question 14

What is the purpose of the transition duct ?

Answer 14

To change the shape of the duct from square to circle

Question 15

What is the purpose of the cascade bend?

Answer 15

Directs the air smoothly and turns 90 degress without causing any turbulence.

Question 16

What is the purpose of the engine intake flare?

Answer 16

Seals the engine intake from the rest of the module and houses the water wash ring for maintenance

Question 17

Describe the module ventilation system

Answer 17

The module ventilation system is a section of ducting around the turbine that cools it. 
The air is pulled through the ventilation system by bernouilis principle acting on the exhaust side if the system creating a depression in the ducting on the exhaust side that draws air through thr module to cool it 
There are valves on the ventilation system the position of the vavles must always be known

Question 18

What principle is used in module ventilation

Answer 18

Bernoulli’s princple