Explain the necessity of compounding in steam turbine and draw a neat sketch of pressure velocity compounding.

Explain the necessity of compounding in steam turbine and draw a neat sketch of pressure velocity compounding. 
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Necessity of compounding in steam turbine: Compounding of steam turbines is necessary 1) To reduce speed of rotor blades to practical limits. 2) To reduce centrifugal force and hence to prevent failure of blades. 3) To reduce velocity of steam leaving blades. If entire pressure drop from boiler pressure to condenser pressure is carried out in a single stage of nozzle then the velocity of steam entering the turbine blades will be very high. The turbine speed has to be also very high as it is directly proportional to steam velocity. Such high rpm of turbine rotor are not useful for practical purposes & there is a danger of structural failure of blades due to excessive centrifugal stresses. Hence compounding is carried out. 

Neat sketch of pressure velocity compounding.

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