modelCombustionChamber
Combustion Chamber
Extends from BaseClasses.CombustionChamberBase (Combustion Chamber).
Information
This model extends the CombustionChamber Base model, with the definition of the gases.In particular, the air inlet uses the Media.Air medium model, the fuel input uses the Media.NaturalGas medium model, and the flue gas outlet uses the Medium.FlueGas medium model.
The composition of the outgoing gas is determined by the mass balance of every component, taking into account the combustion reaction CH4+2O2--->2H2O+CO2.
The model assumes complete combustion, so that it is only valid if the oxygen flow at the air inlet is greater than the stoichiometric flow corresponding to the flow at the fuel inlet.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| SI.Volume | V (from CombustionChamberBase) | Inner volume | |
| SI.Area | S (from CombustionChamberBase) | 0 | Inner surface |
| SI.CoefficientOfHeatTransfer | gamma (from CombustionChamberBase) | 0 | Heat Transfer Coefficient |
| SI.HeatCapacity | Cm (from CombustionChamberBase) | 0 | Metal Heat Capacity |
| SI.SpecificEnthalpy | HH (from CombustionChamberBase) | Lower Heating value of fuel | |
| Boolean | allowFlowReversal (from CombustionChamberBase) | system.allowFlowReversal | = true to allow flow reversal, false restricts to design direction |
| Initialisation | |||
| SI.Temperature | Tmstart (from CombustionChamberBase) | 300 | Metal wall start temperature |
| Air.AbsolutePressure | pstart (from CombustionChamberBase) | 101325 | Pressure start value |
| Air.Temperature | Tstart (from CombustionChamberBase) | 300 | Temperature start value |
| Air.MassFraction[Exhaust.nX] | Xstart (from CombustionChamberBase) | Exhaust.reference_X | Start flue gas composition |
| Choices.Init.Options | initOpt (from CombustionChamberBase) | system.initOpt | Initialisation option |
| Boolean | noInitialPressure (from CombustionChamberBase) | false | Remove initial equation on pressure |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| FlangeA | ina (from CombustionChamberBase) | inlet air | |
| FlangeA | inf (from CombustionChamberBase) | inlet fuel | |
| FlangeB | out (from CombustionChamberBase) | flue gas |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| ThermoPower.System | system (from CombustionChamberBase) | System wide properties | |
| Exhaust.BaseProperties | fluegas (from CombustionChamberBase) | ||
| SI.Mass | M (from CombustionChamberBase) | Gas total mass | |
| SI.Mass[Exhaust.nXi] | MX (from CombustionChamberBase) | Partial flue gas masses | |
| SI.InternalEnergy | E (from CombustionChamberBase) | Gas total energy | |
| SI.Temperature | Tm (from CombustionChamberBase) | Wall temperature | |
| Air.SpecificEnthalpy | hia (from CombustionChamberBase) | Air specific enthalpy | |
| Fuel.SpecificEnthalpy | hif (from CombustionChamberBase) | Fuel specific enthalpy | |
| Exhaust.SpecificEnthalpy | ho (from CombustionChamberBase) | Outlet specific enthalpy | |
| SI.Power | HR (from CombustionChamberBase) | Heat rate | |
| SI.Time | Tr (from CombustionChamberBase) | Residence time | |
| Real | wcomb | Molar Combustion rate (CH4) | |
| SI.PerUnit | lambda | Stoichiometric ratio (>1 if air flow is greater than stoichiometric) |
Revisions
- 31 Jan 2005
by Francesco Casella:
Combustion Chamber model restructured using inheritance.First release.