Steam Boilers, Engines, Nozzles and Turbines
For a Parson's reaction turbine, if α₁ and α₂ are fixed blade angles at inlet and exit respectively and β₁ and β₂ are the moving blade angles at entrance and exit respectively, then

α₁ = β₁ and α₂= β₂
α₁ = α₂ and β₁ = β₂
α₁ < β₁ and α₂ > β₂
α₁ = β₂ and β₁ = α₂

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Steam Boilers, Engines, Nozzles and Turbines
In a reaction turbine

The steam is allowed to expand in the nozzle, where it gives a high velocity before it enters the moving blades
The steam is expanded from a high pressure to a condenser pressure in one or more nozzles
The pressure and temperature of steam remains constant
The expansion of steam takes place partly in the fixed blades and partly in the moving blades

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