Polytropic Pump

fullflow.PolytropicPump

Polytropic pump pressure-rise component.

PolytropicPump models a pump with changing density between the inlet and discharge states. The component solves mass flow as an iteration variable by matching a polytropic pressure-rise estimate to the assigned discharge total pressure.

Parameters

Name	Type	Description
name	str	Component name
network	Network	Network that owns this component
rotor_speed	State	Pump rotor speed
head_rise	State	Pump head rise
mass_flow	State	Pump mass flow rate
upstream_density	State	Upstream fluid density
downstream_density	State	Downstream fluid density
torque	State	Shaft torque
upstream_total_pressure	State	Upstream total pressure
discharge_total_pressure	State	Discharge total pressure
upstream_total_enthalpy	State	Upstream total enthalpy
gravitational_acceleration	float, optional	Gravitational acceleration

Outputs

Name	Type	Description
discharge_total_enthalpy	State, optional	Discharge total enthalpy
efficiency	State, optional	Pump efficiency
shaft_power	State, optional	Shaft power
inlet_volumetric_flow	State, optional	Inlet volumetric flow rate
outlet_volumetric_flow	State, optional	Outlet volumetric flow rate

Iteration Variables

Name	Type	Description
mass_flow	State	Pump mass flow rate

Residuals

Name	Type	Description
pressure_balance	float	Enforces consistency between predicted and assigned discharge pressure predicted_discharge_total_pressure - discharge_total_pressure = 0