modelSteamTurbineStodola
Steam turbine: Stodola's ellipse law and constant isentropic efficiency
Extends from BaseClasses.SteamTurbineBase (Steam turbine).
Information
This model extends SteamTurbineBase by adding the actual performance characteristics:
- Stodola's law
- Constant isentropic efficiency
The inlet flowrate is also proportional to the partialArc signal if the corresponding connector is wired. In this case, it is assumed that the flow rate is reduced by partial arc admission, not by throttling (i.e., no loss of thermodynamic efficiency occurs). To simulate throttling, insert a valve model before the turbine inlet.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Boolean | explicitIsentropicEnthalpy (from SteamTurbineBase) | true | Outlet enthalpy computed by isentropicEnthalpy function |
| Medium.MassFlowRate | wnom (from SteamTurbineBase) | Inlet nominal flowrate | |
| Medium.AbsolutePressure | pnom (from SteamTurbineBase) | Nominal inlet pressure | |
| Real | eta_mech (from SteamTurbineBase) | 0.98 | Mechanical efficiency |
| Boolean | usePartialArcInput (from SteamTurbineBase) | false | Use the input connector for the partial arc opening |
| SI.PerUnit | eta_iso_nom | 0.92 | Nominal isentropic efficiency |
| SI.Area | Kt | Kt coefficient of Stodola's law | |
| Initialisation | |||
| Medium.MassFlowRate | wstart (from SteamTurbineBase) | wnom | Mass flow rate start value |
| SI.PerUnit | PRstart (from SteamTurbineBase) | Pressure ratio start value | |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Blocks.Interfaces.RealInput | partialArc (from SteamTurbineBase) | Partial arc opening in p.u. | |
| Modelica.Mechanics.Rotational.Interfaces.Flange_a | shaft_a (from SteamTurbineBase) | ||
| Modelica.Mechanics.Rotational.Interfaces.Flange_b | shaft_b (from SteamTurbineBase) | ||
| FlangeA | inlet (from SteamTurbineBase) | ||
| FlangeB | outlet (from SteamTurbineBase) |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| ThermoPower.System | system (from SteamTurbineBase) | System wide properties | |
| Medium.ThermodynamicState | steamState_in (from SteamTurbineBase) | ||
| Medium.ThermodynamicState | steamState_iso (from SteamTurbineBase) | ||
| SI.Angle | phi (from SteamTurbineBase) | shaft rotation angle | |
| SI.Torque | tau (from SteamTurbineBase) | net torque acting on the turbine | |
| SI.AngularVelocity | omega (from SteamTurbineBase) | shaft angular velocity | |
| Medium.MassFlowRate | w (from SteamTurbineBase) | Mass flow rate | |
| Medium.SpecificEnthalpy | hin (from SteamTurbineBase) | Inlet enthalpy | |
| Medium.SpecificEnthalpy | hout (from SteamTurbineBase) | Outlet enthalpy | |
| Medium.SpecificEnthalpy | hiso (from SteamTurbineBase) | Isentropic outlet enthalpy | |
| Medium.SpecificEntropy | sin (from SteamTurbineBase) | Inlet entropy | |
| Medium.AbsolutePressure | pin (from SteamTurbineBase) | Outlet pressure | |
| Medium.AbsolutePressure | pout (from SteamTurbineBase) | Outlet pressure | |
| SI.PerUnit | PR (from SteamTurbineBase) | pressure ratio | |
| SI.Power | Pm (from SteamTurbineBase) | Mechanical power input | |
| SI.PerUnit | eta_iso (from SteamTurbineBase) | Isentropic efficiency | |
| SI.PerUnit | theta (from SteamTurbineBase) | Partial arc opening in p.u. | |
| Medium.Density | rho | Inlet density |
Revisions
- 20 Apr 2005
by Francesco Casella:
First release.