### TrbCharFixed00

icon:

convert enthalpy of fluid into mechanical rotational work. Component characteristics are fixed or given by external real-signal.

#### Scope/Calculation function

- Calculation of the change in state quantities of fluid through turbine.
- Calculation of power or torque obtained for given pressure ratio.
- Calculation of pressure ratio as a result of extracted shaft power or torque.

#### Short description of physical model/calculation method

- Fluid outlet state quantities are calculated from inlet state quantities, pressure ratio adiabatic efficiency.
- Causality about power can be selected

- Give power/torque extracted -> Pressure ratio of expansion is calculated. (may be common usage)
- Give pressure ratio -> power and torque extracted are calculated .

- Pressure ratio and adiabatic efficiency can be input by either parameter or real-input interface.

#### Limitations/Assumptions of model

- No flow capacity model. The mass flow rate must be determined outside of this turbine component.
- Mechanical rotational speed must be determined out of this component.
- No phase change of fluid can occur.
- Simulation of abnormal operation where turbine operated as if compressor (possible in windmilling jet engine in flight) or 0 change in fluid pressure cannot be performed.
- Flow reversal condition cannot be simulated.

#### Interface

#### Parameters

Read the descriptions on parameter window in model for details of each parameter. This section only covers parameters which requires descriptions by figures/drawings.

#### Usage

1. Redeclear the package of medium.
2. Fill following connectors:

- fluid ports, _1 and _2.
- flange connectors, _1 and _2.

3. Decide how to determine pressure ratio.

- Pressure ratio is input; power and torque are calculated.

- Provide pressure ratio as parameter.

1. Set switchDetermine_PR= "param" (parameter window)
2. Set pressure ratio value, "PR". (parameter window)

- Provide pressure ratio via real input port.

1. Set switchDetermine_PR= "viaRealInput" (parameter window)
2. Fill connector, u_PR

- Pressure ratio is calculated; torque/shaft are given.

1. Set switchDetermine_PR= "asCalculated" (parameter window)

4. Decide how to determine adiabatic efficiency.

- Provide adiabatic efficiency as parameter.

1. Set switchDetermine_eff= "param" (parameter window)
2. Set pressure adiabatc efficiency, "eff". (parameter window)

- Provide adiabatic efficiency via real input port.

1. Set switchDetermine_eff= "viaRealInput" (parameter window)
2. Fill connector, u_eff

#### Warning/Causions

None

#### Demo models

- PropulsionSystem.Examples.Elements.BasicElements.TrbCharFixed00_ex01

- PropulsionSystem.Examples.Elements.BasicElements.TrbCharFixed00_ex02

- PropulsionSystem.Examples.Elements.BasicElements.Cmp_and_Trb_ex01

- PropulsionSystem.Examples.Elements.BasicElements.Cmp_and_Trb_ex02

#### Equations in details

***** under construction *****

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