### CmpCharFixed00

icon:

raises the pressure of fluid. The work done on fluid is supplied via frange port(shaft). Component characteristics are fixed or given by external real-signal.

#### Scope/Calculation function

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

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

- Fluid outlet state quantities are calculated by pressure ratio and adiabatic efficiency input.
- Causality about power can be selected

- Give pressure ratio -> power and torque are calculated. (may be common usage)
- Give power/torque -> Pressure ratio is 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 compressor component.
- Mechanical rotational speed must be determined out of this component.
- No phase change of fluid can occur.
- Simulation of abnormal operation where fluid pressure drops by windmilling 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 of connectors:

- Fluid inlet port, port_1
- Fluid outlet port, port_2
- Either or both of flange_1, flange_2
- Optional: real signal port for pressure ratio, u_PR
- Optional: real signal port for adiabatic efficiency, u_eff

3. Prameter settings diffrenent depending on causality of calculation.

- Case where you specify pressure ratio, then power and torque are calculated.

1. Set switchDetermine_PR= "param", or "viaRealInput"
2. Set PRdes_paramInput if you "param" is chosen, give pressure ratio value via u_PR if you choose "viaRealInput"

- Caes where you give axial power/torque, then pressrue ratio is calculated.

1. Set switchDetermine_PR= "asCalculated".
2. PRdes_paramInput can be left unset.

On the other hand, axial power/torque must be determined outside of this comopenent.

4. Other parameter settings.

Parameters rather than "General" can be left default value in most of case.

#### Warning/Causions

None

#### Demo models

1. PropulsionSystem.Examples.Elements.BasicElements.CmpCharFixed00_ex01

2. PropulsionSystem.Examples.Elements.BasicElements.CmpCharFixed00_ex02

3. PropulsionSystem.Examples.Elements.BasicElements.Cmp_and_Trb_ex01

4. PropulsionSystem.Examples.Elements.BasicElements.Cmp_and_Trb_ex02

#### Equations in details

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

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