Package HydraulicsByFluidon.MediaIcon for standard packages
Package HydraulicsByFluidon.Media
Standard package icon.
Extends from Modelica.Icons.Package (Icon for standard packages).
| Name | Description |
|---|---|
Base … | |
CustomLiquid | |
Environment | |
HLP32 | |
HLP46 | |
Liquid | |
Oil5W30 | |
PentosinCHF11S | |
Skydrol5 | |
Types … | |
Water |
Model HydraulicsByFluidon.Media.Liquid
Model of a hydraulic liquid. The model provides the other components (e.g. pipes) with temperature- and pressure-dependent fluid properties. In order for the fluid properties to reach the other components, the liquid model must be connected to the hydraulic circuit.
The user can choose between the following liquids:
The model provides the following fluid properties as functions of pressure and temperature:
Due to the used mathematical approach, the fluid properties are only valid within a limited range of temperatures and pressures. If the deviations from the actual fluid properties are too large, the custom fluid can be used.
If the effects of undissolved air are to be considered during the simulation, the user can provide the fraction of undissolved air at ambient pressure through the parameter Proportion of undissolved air. The stiffness of the gas bubbles is calculated based on the parameter Polytropic exponent which can assume values between 1.0 (isothermal change of state, slow compression/expansion) and 1.4 (isentropic change of state, fast compression/expansion).
Extends from HydraulicsByFluidon.Media.Base.BaseFluid.
| Type | Name | Default | Description |
|---|---|---|---|
LiquidTypes | fluidType | HydraulicsByFluidon.Media.Types.LiquidTypes.HLP46 | Type of Liquid |
Temperature | fluidTemperature | 293 | Fluid temperature |
Real | proportionUndissolvedAir | 0.001 | Proportion of undissolved air |
Real | polytropicExponent | 1.1 | Polytropic exponent |
| Type | Name | Description |
|---|---|---|
FluidPort | fluidPort | Hydraulic port |
Model HydraulicsByFluidon.Media.CustomLiquid
Model of a custom hydraulic liquid. The model provides the other components (e.g. pipes) with user-defined temperature- and pressure-dependent fluid properties. In order for the fluid properties to reach the other components, the liquid model must be connected to the hydraulic circuit.
The underlying model is based on the following assumptions:
The density is calculated by the following equation:
The isentropic bulk modulus is given by:
In order to use the component, the following parameters have to be provided by the user:
If the effects of undissolved air are to be considered during the simulation, the user can provide the fraction of undissolved air at ambient pressure through the parameter Proportion of undissolved air. The stiffness of the gas bubbles is calculated based on the parameter Polytropic exponent which can assume values between 1.0 (isothermal change of state, slow compression/expansion) and 1.4 (isentropic change of state, fast compression/expansion).
Extends from Modelica.Blocks.Icons.Block (Basic graphical layout of input/output block) and HydraulicsByFluidon.Media.Base.BaseFluid.
| Type | Name | Default | Description |
|---|---|---|---|
Temperature | fluidTemperature | 293 | |
Real | proportionUndissolvedAir | 0.001 | Proportion of undissolved air |
Real | polytropicExponent | 1.1 | Polytropic exponent |
Pressure | p0 | 101325 | Reference pressure for density calculation |
Temperature | T0 | 288.15 | Reference temperature for density calculation |
Density | rho0 | 870 | Density of fluid at reference temperature and pressure |
BulkModulus | Kt | 1.7e+9 | Isothermal bulk modulus |
CubicExpansionCoefficient | Gammap | 7e-4 | Thermal expansion coefficient |
SpecificHeatCapacityAtConstantPressure | cp | 2000 | Specific heat capacity at constant pressure |
Temperature | T1 | 313.15 | First reference temperature for viscosity calculation |
KinematicViscosity | nu1 | 4.6e-5 | Kinematic viscosity at T1 and ambient pressure |
Temperature | T2 | 373.15 | Second reference temperature for viscosity calculation |
KinematicViscosity | nu2 | 7e-6 | Kinematic viscosity at T2 and ambient pressure |
| Type | Name | Description |
|---|---|---|
FluidPort | fluidPort | Hydraulic port |
Model HydraulicsByFluidon.Media.Environment| Type | Name | Default | Description |
|---|---|---|---|
Temperature | TAmbient | 294.15 | |
AbsolutePressure | pAmbient | 101325 | |
Acceleration | g | 9.81 |
Partial Class HydraulicsByFluidon.Media.HLP32
Hydraulic oil with a viscosity of 32 cSt (@ambient pressure and 40 °C), specific heat capacity at constant pressure of 1944 J/(kg K) (@ambient pressure and 20 °C), isobaric thermal expansion coefficent of 0.000729 1/K (@ambient pressure and 20 °C).
The following diagrams show the variation of density, kinematic Viscosity and isentropic bulk modulus of HLP 32 as a function of pressure and temperature.
Partial Class HydraulicsByFluidon.Media.HLP46
Hydraulic oil with a viscosity of 46 cSt (@ambient pressure and 40 °C), specific heat capacity at constant pressure of 1944 J/(kg K) (@ambient pressure and 20 °C), isobaric thermal expansion coefficent of 0.000729 1/K (@ambient pressure and 20 °C).
The following diagrams show the variation of density, kinematic Viscosity and isentropic bulk modulus of HLP 46 as a function of pressure and temperature.
Partial Class HydraulicsByFluidon.Media.Oil5W30
Typical engine oil with a viscosity of 44 cSt (@ambient pressure and 40 °C), specific heat capacity at constant pressure of 2007 J/(kg K) (@ambient pressure and 20 °C), isobaric thermal expansion coefficent of 0.000749 1/K (@ambient pressure and 20 °C).
The following diagrams show the variation of density, kinematic Viscosity and isentropic bulk modulus of the oil 5W30 as a function of pressure and temperature.
Partial Class HydraulicsByFluidon.Media.PentosinCHF11S
Power steering and central hydraulic oil with a viscosity of 19 cSt (@ambient pressure and 40 °C), specific heat capacity at constant pressure of 1392 J/(kg K) (@ambient pressure and 20 °C), isobaric thermal expansion coefficent of 0.000805 1/K (@ambient pressure and 20 °C).
The following diagrams show the variation of density, kinematic Viscosity and isentropic bulk modulus of Pentosin CHF 11S as a function of pressure and temperature.
Partial Class HydraulicsByFluidon.Media.Skydrol5
Hydraulic oil specifically designed for aerospace applications with a viscosity of 9 cSt (@ambient pressure and 40 °C), specific heat capacity at constant pressure of 1944 J/(kg K) (@ambient pressure and 20 °C), isobaric thermal expansion coefficent of 0.000857 1/K (@ambient pressure and 20 °C).
The following diagrams show the variation of density, kinematic Viscosity and isentropic bulk modulus of Skydrol 5 as a function of pressure and temperature.
Partial Class HydraulicsByFluidon.Media.Water
Plain water with a viscosity of 0.66 cSt (@ambient pressure and 40 °C), specific heat capacity at constant pressure of 1944 J/(kg K) (@ambient pressure and 20 °C), isobaric thermal expansion coefficent of 0.000467 1/K (@ambient pressure and 20 °C).
The following diagrams show the variation of density, kinematic Viscosity and isentropic bulk modulus of Water as a function of pressure and temperature.
