Enthalpy and Entropy Diagram
The stagnation state of the gas at the nozzle entry is represented by point 01. The gas expands adiabatically in the nozzles from a pressure p1 to p2 with an increase in its velocity from c1 to c2. Since this is an energy transformation process, the stagnation enthalpy remains constant but the stagnation pressure decreases (p01 > p02) due to losses. The energy transfer accompanied by an energy transformation process occurs in the rotor.
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Enthalpy-entropy diagram for flow through an IFR turbine stage
Read more about this topic: Radial Turbine
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