PRIN. OF INTERNAL COMBUSTION ENGINES - OD1619 LESSON 1/TASK 2
FIGURE 31.
THE TWO STROKE CYCLE DIESEL ENGINE.
(4) It mixes its fuel and air in the combustion chamber as in a four stroke cycle
diesel engine.
The air enters through the intake ports and the fuel is injected
into the combustion chamber by the fuel injection system.
(5) The air supply to the engine is constant while the speed and power output of
the engine is regulated by controlling the quantity of fuel injected into the
combustion chamber.
(6) Unlike any of the other engine types, the two stroke cycle diesel engine must
have a supercharger to force the intake air into the upper cylinder.
The most
common type used is the Rootes.
b.
Operation (figure 32 on the following page).
(1) Scavenging.
Scavenging begins with the piston at bottom dead center.
The
intake ports are uncovered in the cylinder wall and the exhaust valve opens. Air
is forced into the upper cylinder by the supercharger.
As the air is forced in,
the burnt gases from the previous operating cycle are forced out.
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