why vaccume required in turbine?

Answer Posted / k devanesan

The last stage absolute temp. of steam will be near to
vacuum pressure. To maintain the dryness fraction of steam
in last stage vacuum required in the down stream of steam
flow. so, vacuum need in condenser.(P1V1/T1=P2V2/T2.)in
condenser there is no temp. drop. so P1V1=P2V2. the volume
of condenser is more than last stage area. so, pr. will be
less than last stage pr.

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