Презентация на тему Different types of marine engines

the diesel engine

the steam turbine

the gas turbine

the marine nuclear plant

Each type of engine has its own particular application.

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.

combustion engine.

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.

diesel engine.

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.

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.

that gas rather than steam is used to
turn

the shaft. These have also become
more suitable for use in ships.

easily removed for maintenance. It is also suitable for

complete automation.

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.