Explain the need of compounding. Suggest the method of compounding for reaction steam turbine with justification.

Explain the need of compounding. Suggest the method of compounding for reaction steam turbine with justification.
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1 Answer

Answer :

Need of compounding:

✔The compounding of steam turbine means the methods to reduce the speed of rotor shaft.

✔To increase the thermal efficiency in power plants, high pressure and high temp. steam is used.

✔If the entire pressure drop (from boiler pressure to condenser pressure)is carried out one stage only.

✔Then the velocity of steam entering into the turbine will be extremely high.

✔This will make the rotor to run at a very high speed, which is not useful from practical point of view.

✔Hence it becomes necessary to reduce the rotor speed of turbine by gearing or no. of stages.


Following are the methods of compounding:
i. Velocity compounding
ii. Pressure compounding
iii. Pressure-Velocity compounding 
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