Saturation vapor curve

Saturation vapor curve

The "saturation vapor curve" usually states for the separation curve between the two-phase state and the vapor state in the T-s thermodynamic diagram. When used in a power cycle, the fluid expansion depends strongly on the nature of this saturation curve :

* A "wet" fluid shows a negative saturation vapor curve. If overheating before the expansion is limited, a two-phase state is obtained at the end of the expansion.
* An "isentropic" fluid shows a vertical saturation vapor curve. It remains very close to the saturated vapor state after an hypothetical isentropic expansion.
* A "dry" fluid shows a positive saturation vapor curve. It is in dry vapor state at the end of the expansion, and strongly overheated.


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