modelGTunitBase
Gas Turbine
Extends from ThermoPower.Icons.Gas.GasTurbineUnit.
Information
This model describes a gas turbine unit as a single model, including the interface and all equations, except the computation of the performance characteristics and of the exhaust composition.Actual operating conditions are related to ISO standard conditions pnom and Tnom by the following relationship:
- HI_ISO = HI*sqrt(Tnom/gas.T)*(pnom/gas.p)
- ZLPout_ISO = ZLPout*sqrt(Tnom/gas.T)*(pnom/gas.p)
- wia_ISO = wia*pnom/gas.p*sqrt(gas.T/Tnom)
where HI is the heat input, ZLPout the zero loss power output and wia the air inlet flow.
Modelling options
This model has three different Medium models to characterize the inlet air, fuel, and flue gas exhaust.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Exhaust.AbsolutePressure | pnom | 1.013e5 | ISO reference pressure |
| Air.Temperature | Tnom | 288.15 | ISO reference temperature |
| SI.SpecificEnthalpy | HH | Lower Heating value | |
| SI.PerUnit | eta_mech | 0.95 | mechanical efficiency |
| Boolean | allowFlowReversal | system.allowFlowReversal | = true to allow flow reversal, false restricts to design direction |
| Initialisation | |||
| Modelica.SIunits.Pressure | pstart | start pressure value | |
| Exhaust.Temperature | Tstart | start temperature value | |
| Modelica.SIunits.MassFraction[Air.nX] | Xstart | Air.reference_X | start gas composition |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| FlangeA | Air_in | ||
| FlangeA | Fuel_in | ||
| FlangeB | FlueGas_out | ||
| Modelica.Mechanics.Rotational.Interfaces.Flange_b | shaft_b |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| ThermoPower.System | system | System wide properties | |
| Air.BaseProperties | gas | ||
| Air.MassFlowRate | wia | Air mass flow | |
| Air.MassFlowRate | wia_ISO | Air mass flow, referred to ISO conditions | |
| Fuel.MassFlowRate | wif | Fuel mass flow | |
| Exhaust.MassFlowRate | wout | FlueGas mass flow | |
| Air.SpecificEnthalpy | hia | Air specific enthalpy | |
| Fuel.SpecificEnthalpy | hif | Fuel specific enthalpy | |
| Exhaust.SpecificEnthalpy | hout | FlueGas specific enthalpy | |
| SI.Angle | phi | shaft rotation angle | |
| SI.Torque | tau | net torque acting on the turbine | |
| SI.AngularVelocity | omega | shaft angular velocity | |
| SI.Power | ZLPout | zero_loss power output | |
| SI.Power | ZLPout_ISO | zero_loss power output, referred to ISO conditions | |
| SI.Power | Pout | Net power output | |
| SI.Power | HI | Heat input | |
| SI.Power | HI_ISO | Heat input, referred to ISO conditions | |
| SI.PerUnit | PR | pressure ratio | |
| Exhaust.AbsolutePressure | pc | combustion pressure | |
| Air.AbsolutePressure | pin | inlet pressure |
Contents
| Name | Description |
|---|---|
 Air | |
| Fuel | |
| Exhaust |
Revisions
- 19 Apr 2005
by Francesco Casella:
GTunit model restructured using inheritance.
First release.