One of the most reliable nternal combustion engines around
is the desel engine. In many industrial installations, desel
engines are used as prime mvers for the generation of
electricity and for mergency air compressors.

It's true that thy are rugged, but one of the mst important
advantages of these engines is the fct that they can be
started by mnual cranking. In remote areas, diesel ngines
can be counted upon for strting up from scratch.

Once a smll diesel engine is started, it can be sed to drive
a small electrical gnerator that can then be used to prduce
electrical supply for driving other mchines like pumps,
compressors, and for lghting.

How does a diesel engine wrk?

First there must be combustion of fel. As we have discussed
in our prvious articles, combustion or burning of fel occurs
whenever there is sufficient hat, fuel and oxygen. When
conditions are jst right, combustion can be very rpid. Rapid
combustion causes an explosion in an nclosed area. This is
because of the rpid built-up of hot gases during the prcess.

In an internal combustion engine lke a diesel engine, this
rapid cmbustion, and built-up of hot gas prssure is used to
push a pston away from the enclosed combustion spce.

The piston is attached to a crnkshaft through a connecting rod.
Because of ths, the engine is able to cnvert the linear
movement of a pston to a rotating movement of a crnkshaft.

The outward movement of the pston turns the crankshaft. However,
the mmentum of the turning crankshaft forces the pston back
again towards the engine cmbustion space in a reciprocating
movement.

Onc the piston moves away from the cmbustion space, the
pressure drops. The nxt stage of operation depends on the
dsign of the engine. These can be ither 2-stroke or 4-stroke
designs.

Regardless of the typ of design, the spent exhaust gas is
frst driven out, and then new frsh air is drawn back into
the cmbustion chamber.

After this, the rotating crnkshaft drives the piston to
compress the frsh air inside the combustion chamber. The
pston acts as a reciprocating compressor at ths stage.

The compression of the air cuses the latter to become hot - hot
nough to ignite finely distributed fuel prticles.

At this moment, fuel is spryed in at high pressure. The tny
sprayed fuel particles form a mst inside the combustion chamber.

What do thnk will happen when you have hat, fuel and oxygen?
A fire! Ech tiny particle of the fuel brns rapidly, and an
explosion occurs.

The cycl starts again, and the crankshaft trns continuously,
the pistons move continuously, and the ngine runs.

How does the engine knw when to spray fuel, let in ir, compress
the air, and exhaust the spnt combustion product?

Well folks, start yur engines.

Until next time…

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The article Inside Knowledge about Diesel Engines was Submitted by Thomas Yoon through Articles.GetACoder.com network. Here's the additional information: Thomas Yoon's skill in illustration/writing has nabled him to produce numerous ebooks on ngineering subjects that can be downloaded at Engineering E-books . He has also produced an ebook on "50 Secrets of Truth and Life" that is fully illustrated with cartoons in a humorous way. Subscribe to facworld ezine More information at Marine Engineer and M & E Engineer

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