Working of two stroke diesel engine

UPWARD STROKE OR SUCTION AND COMPRESSION:-

• Piston moves BDC to TDC. At this time fresh air is compressed at the top of cylinder.

• At the same time inlet port is opened by the lower edge of the piston.

• Due to the partial vacuum in crank case, suction will be carried. So fresh air is drawn into the crank case.

• This fresh air forces the fresh air already placed in crank case to the transfer port.

• And then it enters into the combustion region. Now the piston closes the transfer port and then it closed exhaust port.

• When the piston reached TDC fuel is injected by the fuel injector and combustion takes place.

DOWNWARD STROKE OR EXPANSION AND EXHAUST :-

• After the combustion, high temperature and pressure created inside the cylinder.

• Due to this piston moves in downward direction. At this time both exhaust and transfer port is opened. Inlet port is closed.

• Then fresh air pushes the exhaust gas through the exhaust port.

• When the piston reach BDC the piston moves upward again and the cycle will be continued.

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