SAFARI

4 DLT ENGINE

TURBOCHARGER

Working Principle of Turbocharger

he power output from an internal combustion engine

depends on the mass of the air and fuel quantity that

are available for combustion. To increase the engine

horse power, more air for combustion and more fuel

have to be delivered. In case of a naturally aspirated

engine, the power increase is obtained by increasing

the swept volume or by raising the speed. Increasing

the swept volume, however, in general leads to larger

and heavier engines that are expensive.While a speed

increase involves considerable technical problems and

obvious disadvantages, like low mechanical

efficiency, increased wear and tear and increase in

noise etc.

Power increase with unchanged swept volume at the

same engine speed can be obtained by what is known

as supercharging of the engine.

uper charger delivers precompressed air to the

engine cylinders i.e. engine intake pressure is higher

than atmospheric whereas in naturally aspirated

engines it is slightly below atmospheric.

he turbocharger is one of the common super charging

devices used in an engine. It makes use of thermal

energy of engine exhaust gases to run a turbine which

in turn drives a compressor to pressurize the inlet air.

AIR TO

INDUCTIONMANIFOLD

COMPRESSOR

HOUSING

COMPRESSOR

WHEEL

AIR

FROM

FILTER

TURBINE

HOUSING

SHAFT &

TURBINE

WHEEL

ASSEMBLY

GASES TO

EXHAUST

PIPE

BEARING

HOUSING

THRUST

BEARING

COMPRESSOR

BACKPLATE

GASES FROM

EXHAUST MANIFOLD

Fig. 185

OIL OUTLET

OIL INLET