modelSteamTurbineBase
Steam turbine
Information
This base model contains the basic interface, parameters and definitions for steam turbine models. It lacks the actual performance characteristics, i.e. two more equations to determine the flow rate and the efficiency.
This model does not include any shaft inertia by itself; if that is needed, connect a Modelica.Mechanics.Rotational.Inertia model to one of the shaft connectors.
Modelling options
The following options are available to calculate the enthalpy of the outgoing steam:
- explicitIsentropicEnthalpy = true: the isentropic enthalpy hout_iso is calculated by the Medium.isentropicEnthalpy function.
- explicitIsentropicEnthalpy = false: the isentropic enthalpy is given equating the specific entropy of the inlet steam steam_in and of a fictional steam state steam_iso, which has the same pressure of the outgoing steam, both computed with the function Medium.specificEntropy.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Boolean | explicitIsentropicEnthalpy | true | Outlet enthalpy computed by isentropicEnthalpy function |
| Medium.MassFlowRate | wnom | Inlet nominal flowrate | |
| Medium.AbsolutePressure | pnom | Nominal inlet pressure | |
| Real | eta_mech | 0.98 | Mechanical efficiency |
| Boolean | usePartialArcInput | false | Use the input connector for the partial arc opening |
| Initialisation | |||
| Medium.MassFlowRate | wstart | wnom | Mass flow rate start value |
| SI.PerUnit | PRstart | Pressure ratio start value | |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Blocks.Interfaces.RealInput | partialArc | Partial arc opening in p.u. | |
| Modelica.Mechanics.Rotational.Interfaces.Flange_a | shaft_a | ||
| Modelica.Mechanics.Rotational.Interfaces.Flange_b | shaft_b | ||
| FlangeA | inlet | ||
| FlangeB | outlet |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| ThermoPower.System | system | System wide properties | |
| Medium.ThermodynamicState | steamState_in | ||
| Medium.ThermodynamicState | steamState_iso | ||
| SI.Angle | phi | shaft rotation angle | |
| SI.Torque | tau | net torque acting on the turbine | |
| SI.AngularVelocity | omega | shaft angular velocity | |
| Medium.MassFlowRate | w | Mass flow rate | |
| Medium.SpecificEnthalpy | hin | Inlet enthalpy | |
| Medium.SpecificEnthalpy | hout | Outlet enthalpy | |
| Medium.SpecificEnthalpy | hiso | Isentropic outlet enthalpy | |
| Medium.SpecificEntropy | sin | Inlet entropy | |
| Medium.AbsolutePressure | pin | Outlet pressure | |
| Medium.AbsolutePressure | pout | Outlet pressure | |
| SI.PerUnit | PR | pressure ratio | |
| SI.Power | Pm | Mechanical power input | |
| SI.PerUnit | eta_iso | Isentropic efficiency | |
| SI.PerUnit | theta | Partial arc opening in p.u. |
Contents
| Name | Description |
|---|---|
 Medium |
Revisions
- 20 Apr 2005
by Francesco Casella:
First release. - 5 Oct 2011
by Francesco Casella:
Small changes in alias variables.