Internal Structure of Diesel Engines

In diesel engines fuel is ignited with the air that is compressed to rise the temperature. The rising piston compress the air drawn in cylinder at a much high compression ratio than gas engines,up to 25:1, with the air temperature reaching 700 – 900 degrees C.

Then at a high pressure diesel fuel is injected into the combustion chamber to get mixed with the hot pressured air through atomizing nozzle. As a result this mixture get burnt very rapidly.This combustion will cause the gas in the chamber to heat up rapidly, which increases the pressure and forces the piston downwards.

The rod connected to piston and crankshaft comes in motion and transmit this motion to crankshaft. The scavenging of the engine is either done by ports or valves.For getting best result from a diesel engine, use of a turbocharger to compress the intake of air is vital. Using an intercooler or aftercooler to cool the intake air after compression by the turbocharger is a better way to increase the efficiency of engine.

In older diesel engines function, speed of the engine used to be limited by controlling the rate of fuel that was delivered.Unlike gas engines, the air that comes in is not throttled, so the engine would overspeed if this wasn’t done. Older style injection systems were driven by a gear system that came from the engine.

Today diesel engines has provide very much to the vehicle’s world.Still it is not the destination and we can hope more as the technology is getting better it will achieve a new target in future.

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