1. SHIP PROPULSION

2. Ship (Marine) propulsion
Mechanism used to move a ship across water (engine turning a propeller)
Choice of a suitable powerplant depends on:
size of the ship
speed (type of cargo)
length, duration of voyage
cost (operational expenses)
fuel

3. Diesel Engine
In 1892 Rudolph Diesel invented the compression ignition engine
The most widely used propulsion
Two-stroke (large engines)
Four-stroke (auxiliary e.) ,.

4. Diesel Engine PROS: CONS: most efficient prime mover
lower fuel consumption
less bunker space
CONS:
more expensive to build and maintain
more noise and vibration
heavier

5. Steam Turbine
Marine steam turbine was developed by Sir Charles Algernon Parsons
Low noise, low weight, low maintenance costs, more space obtained (power /weight ratio raised)
BUT higher fuel consumption

6. Steam Turbine
Most new-build ships with steam turbines are specialist vessels such as nuclear-powered vessels, and certain merchant vessels (LNG, coal carriers) where cargo can be used as bunker fuel.

7. Diesel electric drive
Large cruiser, tankers, ferries, ro-ro passenger ships and LNG carriers
PRINCIPLE
1. diesel engine connected to a generator
2. Generators drive electric motors
3. Electric motors drive the shaft

8. Turbo-electric drive PRINCIPLE
1.Turbines generate mechanical energy and drive generators
Generators convert mechanical into electrical energy and drive motors
Motors convert back the electrical into mechanical energy and drive the propeller shaft

9. Gas turbine A compressor draws in and compresses atmospheric air.
A combustion system where fuel is injected, mixed with compressed air and burned.
Power turbine to the shaft.
Poor thermal efficiency at low power.

10. Nuclear propulsion Submarines, navy ships (air- craft carriers),
icebreakers.