Marine Engineering Knowledge LEC 3 | Marine Courses Center

Marine Engineering Knowledge LEC 3 | Marine Courses Center

Marine Engineering Knowledge LEC 2 | Marine Courses Center

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Lecture 3
A heat engine is a machine that converts thermal energy to mechanical output.

Heat engines are divided to two types :


A. External combustion engines.

B. Internal combustion engines.

A-External combustion engines:

External combustion engines

In this type combustion takes place outside the engine same as steam turbines which use steam to run , Steam is produced by a boiler.


Steam turbine:

Steam turbine


is a mechanical device that extracts thermal energy from pressurized steam and converts it into rotary motion, here the steam is expanded to produce a high – speed steam current which press against vanes to rotate an impeller.

B- burning engines:

The internal combustion engine is an engine during which the combustion of fuel occurs in a very combustion chamber. the expansion of the extreme temperature and Pressure gases, directly applies force to a movable component of the engine, like the pistons in diesel engines or turbine blades in turbine and by moving it over a distance, generate useful energy.

Diesel engines:

Diesel engines


In this type of engines the compression ration is enough (15/1) to generate the pressure and temperature which are enough for self ignition of the injected fuel it is called compression ignition engine C.I.E.

Gas turbine:

is an internal combustion engine , it consists of three main parts:

1- air compressor :

suck air from atmosphere and compress it to the combustion chamber.

2- combustion chamber :

the combustion is happening due to the injection of fuel and compressed air and will produce gases with high pressure and temperature apply force to turbine blades which will rotate in
high speed.

3- turbine :

consists of a wheels with blades fixed on a shaft , when the gases apply force to the blades they rotate the wheels with the shaft and run with high speed. The rotation of the shaft is the useful mechanical output.


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