CmpCharFixed00

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 *****