Gas Turbines Flashcards
What is IEP
Intergrated electric propulsion e.g type 45
What is CODLAG
Combination of diesel electric and gas
Name the advantages of a gas turbine
*allow the ship to get underway quickly
*Ease of operation and emphasis on remote control
*High power to weight ratio
Minimum ship-borne maintenance
*lower man-power requirement
What is the purpose of a gas turbine
Convert heat energy into rotary motion for ships propulsion
What are the 5 stages of gas turbines
- Induction
- Compression
- Combustion
- Power
- Exhaust
What is the percentages for air
Primary air (15%) Secondary air (10%) Teritary air (75%)
What is the purpose of the stone guard
Prevents large/coarse particles (bits and beaks) of debris from entering the gas turbine (1inch wire mesh to prevent damage)
What is the purpose of the splitter silencer
Spilts up the air flow stream which reduces air noise and buffeting
What is stage 1
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 it
What is stage 2
KNITMESH FILTER (aluminium frame supporting woven material) removes particulate matter
What is stage 3
WATER SEPARATION (manometric leg) ( u-bend principal) water drains into a water trough, which ensures a water seal across the bottom of the filters
Explain Transition Duct
Provides a smooth change from square cross section air to flow to circular cross section air flow, in preparation for entering the engines air intake casing
Explain Cascade Bend
Directs the air smoothly through a 90-degree bend without causing any turbulence to the already smoothed out air flow
Explain Engine Intake Flare
Seals the engine intake from the rest of the module and houses the “water wash ring” used for cleaning the engine
What is the function of the module vent flaps
To isolate the module in the event of an emergency e.g a fire
