Losses In steam turbines.

When increase heat energy required for doing mechanical work in actual practice as compare to the theoretical value , in which the process of expansion takes place strictly according to the adiabatic process , Is termed as energy loss in steam turbine. .

The losses s of the steam turbines are  given as..

 1-  INTERNAL LOSSES

Losses directly connected with the steam conditions while in its flow through the turbine are called “internal losses.

They may further classified as:-

1-   Losses in regulating valves.

2-   Losses in nozzles

3-  Losses in moving blade

·         Losses due to trailing edge wakes

·         Impingement losses

·         Losses due to leakage of steam through the angular space.

·         Friction losses

·         Losses due to turning of the steam jet in blades.

·         Losses due to shrouding Leaving

4  Leaving velocity losses (exist velocity)

5- Losses due to friction of disc carrying the blades and wind age losses.

6  Losses due to clearance between the rotor and guide blade disc.

7 Losses due to wetness of steam.

8 Losses in exhaust piping.

 2 EXTERNAL LOSSES.

 These losses not influence with steam condition.

  

Its  may be classified as.

1-   Mechanical losses.

 2-  Losses due to leakages of steam from the labyrinth gland seal.