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Model ExpanderOpenDriveDetailed represents the expanson of fluid in an open-drive volumetric machine. The evolution of the fluid through the expander is decomposed into six thermodynamic processes, as shown in the figure:

• Supply pressure drop (su –> su,1)
• Supply cooling-down (su,1 –> su,2)
• Isentropic expansion to the internal pressure imposed by the built-in volume ratio of the expander (su,2 –> in)
• Expansion at a fixed volume to the exhaust pressure (in –> ex,2)
• Mixing between suction flow and leakage flow (ex,2 –> ex,1)
• Exhaust cooling-down or heating-up (ex,1 –> ex)

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