Steam Boilers, Engines, Nozzles and Turbines
The diagram factor is the ratio of the

Any one of the above
Actual mean effective pressure to the theoretical mean effective pressure
Actual workdone per stroke to the theoretical workdone per stroke
Area of the actual indicator diagram to the area of theoretical indicator diagram

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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 expansion of steam takes place partly in the fixed blades and partly in the moving blades
The pressure and temperature of steam remains constant

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