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SHIP PROPULSION. Ship (Marine) propulsion 4 Mechanism used to move a ship across water (engine turning a propeller) 4 Choice of a suitable powerplant.

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Presentation on theme: "SHIP PROPULSION. Ship (Marine) propulsion 4 Mechanism used to move a ship across water (engine turning a propeller) 4 Choice of a suitable powerplant."— Presentation transcript:

1 SHIP PROPULSION

2 Ship (Marine) propulsion 4 Mechanism used to move a ship across water (engine turning a propeller) 4 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 4 In 1892 Rudolph Diesel invented the compression ignition engine 4 The most widely used propulsion 4 Two-stroke (large engines)  Four-stroke (auxiliary e.)

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

5 Steam Turbine 4 Marine steam turbine was developed by Sir Charles Algernon ParsonsCharles Algernon Parsons 4 Low noise, low weight, low maintenance costs, more space obtained (power /weight ratio raised) 4 BUT higher fuel consumption

6 Steam Turbine 4 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 4 Large cruiser, tankers, ferries, ro-ro passenger ships and LNG carriers 4 PRINCIPLE 4 1. diesel engine connected to a generator 4 2. Generators drive electric motors 4 3. Electric motors drive the shaft

8 Turbo-electric drive 4 PRINCIPLE 4 1.Turbines generate mechanical energy and drive generators 4 Generators convert mechanical into electrical energy and drive motors 4 Motors convert back the electrical into mechanical energy and drive the propeller shaft

9 Gas turbine 4 A compressor draws in and compresses atmospheric air. 4 A combustion system where fuel is injected, mixed with compressed air and burned. 4 Power turbine to the shaft. 4 Poor thermal efficiency at low power.

10 Nuclear propulsion 4 Submarines, navy ships (air- craft carriers), icebreakers.


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