Operation
6500−1/A1
Winterthur Gas & Diesel Ltd.
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Turbocharging
1. General
The turbocharger is accurately tuned to the engine and related to the number of
cylinders, service output, mode of operation etc.
Data about operation, maintenance and servicing are given in the related
documentation of the manufacturer (which is part of the Operating Instruction).
CAUTION
Damage Hazard: If you operate the engine with a turbocharger cut
out, you must obey the operation limits given in the Service
Bulletin RT−162 to prevent damage to the engine.
For data about the operation limits of operation with a turbocharger cut out, see
Service Bulletin RT−162.
2. Function
Exhaust gas (EG, Fig. 1) from the cylinders collects in the manifold (15). The exhaust
gas moves the turbine (16), then flows out through the exhaust gas outlet (EO) to the
exhaust system of the vessel. The exhaust gas turns the turbine and moves the
compressor (2), which is attached to the same shaft. The compressor pulls fresh air
(FA) from the engine room through a filter/silencer.
The compressor compresses and heats the scavenge air (SA). This hot compressed
air flows into the charging unit (5) through the scavenge air cooler (SAC) (3), which
cools the air to a lower temperature range. Because of the high humidity in the air, the
SAC produces a large quantity of condensation. The water separator (4) removes the
condensation, which flows through the drains (WD and CD).
The scavenge air flows from the air space (AS) through the flaps 18 to the receiver
space (RS) and then into the piston underside (PU).
When the piston (9) is near BDC, scavenge air flows through the open inlet ports (10)
into the cylinder (12).
After the compression, combustion, and expansion process, the exhaust valve (14)
opens and exhaust gas (EG) flows into the manifold (15), which completes the cycle.
During engine start, or low load operation the auxiliary blowers (8) supply air from the
air space (AS) to the receiver space (RS). A non-return valve prevents the back-flow
of air (see also 6420−1 Scavenge Air Receiver).
2015-12
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