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1 слайд
Different types
of marine engine
2 слайд
There are four main types of marine engine:
the diesel engine
the steam turbine
the gas turbine
the marine nuclear plant
Each type of engine has its own particular application.
3 слайд
Diesel Engine
The diesel engine is a form of internal
combustion engine.
Its power is expressed as break horse
power (b.h.p).
This is the power put out by the engine.
Effective horse power is the power developed
by the piston in the cylinder, but some of is
lost by friction within the engine.
This power is now expressed in kilowatts.
4 слайд
The diesel engine is a form of internal combustion engine.
5 слайд
Low-Speed Engine
Large diesel engines, which have cylinder nearly 900 mm in diameter, turn at the relatively slow speed of about 145 rpm and less. They are known as low-speed diesel engines. They can be connected differently to the propeller without gearing. Although higher power could be produced by higher revolutions, this would reduce the efficiency of the propeller, because the propeller is more efficient the larger it is and the slower it turns.
6 слайд
The MAN B&W 5S50MC 5-cylinder, 2-stroke, low-speed marine diesel engine.
7 слайд
Medium-Speed Diesel Engine
More and more of the larger merchant vessels are being powered by medium-speed diesel engines. These operate between 150 and 450 r.p.m, therefore they are connected to the propeller by gearing. They are cheaper than slow-speed diesel engines, and their smaller size and weight can result in the smaller cheaper ships.
8 слайд
Steam Turbine
In steam turbines high pressure steam is
directed into a series of blades or vanes
attached to the shaft, causing it to rotate.
This rotary motion is transferred to the
propeller shaft by gears. Steam is produced
by boiling water in the boiler, which is
fired by oil. Recent developments in
steam turbines which have reduced
fuel consumption and raised power
output have made them more attractive as
an alternative to diesel power in ships.
Turbines are often used in container ships.
9 слайд
10 слайд
Turbines are often used in container ships.
11 слайд
Gas turbine
Gas turbines differ from steam turbines
if that gas rather than steam is used to
turn the shaft. These have also become
more suitable for use in ships.
12 слайд
A gas turbine engine is very light and easily removed for maintenance. It is also suitable for complete automation.
13 слайд
Marine Nuclear Plant
Nuclear power in ship has mainly been confined to ice-breakers. A nuclear-powered ship differs from a conventional turbine ship in that it uses the energy released by the decay of radioactive fuel to generate steam. The steam is used to turn a shaft via a turbine in the conventional way.
14 слайд
Thank You For Attention!
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