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MapleSim Hydraulics Library from Modelon

Ori Poly  Orifice model using a polynomial approach with volumes at the ports

The Ori Poly component describes the laminar/turbulent flow through an orifice using a polynomial approach. The mass and flow forces are not included. Use the modifier(s)

VolumeA(port_A(p(start=1e5,fixed=true)))

and/or

VolumeB(port_A(p(start=1e5,fixed=true)))

to set the initial condition(s) for the pressure of the lumped volume(s) [Pa].

Related Components

Name

Description

Lam Res

Resistance with laminar flow and volumes at the ports.

Orifice

Recommended component. The component, based on the loss coefficient K, describes both flow regimes: laminar for very small Reynolds numbers and turbulent for higher Reynolds numbers (default model).

Ori Cav

Orifice component checking for cavitation.

Sim Ori

Simple textbook component, using a constant discharge coefficient. It is valid for turbulent flow only; severe numerical problems for laminar flow.

Metering Ori

Metering Orifice (that is, component Orifice No States with variable diameter).

Two Orifices

Two orifices in series, one with variable the other with fixed flow area.

Restrictions[Basic]

Differences between basic models are shown by a figure.

Connections

Name

Description

Modelica ID

portA

Layout of port where oil flows into an element (0<mflow, pB<pA means 0<&Delta;p)

port_A

portB

Hydraulic port where oil leaves the component (mflow<0, pB<pA means 0<&Delta;p)

port_B

oil

 

oil

Parameters

Name

Default

Units

Description

Modelica ID

&Delta;Tsystem

0

K

Temperature offset from system temperature

dT_system

use volume A

true

 

If true, a volume is present at port_A

useVolumeA

use volume B

true

 

If true, a volume is present at port_B

useVolumeB

VA

10-6

m3

Geometric volume at port A

volumeA

VB

10-6

m3

Geometric volume at port B

volumeB

d

0.001

m

Orifice diameter

diameter

cturb

0.707

 

Discharge coefficient

cturb

k1

10

 

Laminar part

k1

k2

2

 

k2&equals;1Cd2

k2

G

1.53·10-11

m3sPa

Hydraulic conductance G&equals;&PartialD;q&PartialD;p

G

ptrans

[1]

Pa

Transition pressure

p_trans

trans

100

1

Transition Reynolds number

Re_trans

Transition

2

 

Transition model

Transition

reg type

3

 

Regularization type

regtype

reg param

3

 

Regularization parameter

regparam

[1] 9trans2`oil.density``oil.p0`&comma;`oil.T0``oil.kinematicViscosity``oil.p0`&comma;`oil.T0`28cturb2d2

See Also

[Restrictions]Basic, Lam Res, Metering Ori No States, Ori Cav, Orifice, Orifice No States, Restrictions, Sim Ori, Two Orifices, MapleSim Hydraulics Library from Modelon Overview


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