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MapleSim Hydraulics Library from Modelon

Ori Cav No States  Orifice model for laminar/turbulent flow possibly with cavitation

The Ori Cav No States component describes the laminar/turbulent flow through an orifice possibly with cavitation. It is valid if

1<d

This condition is checked by an assert statement. The mass and flow forces are not included.

Related Components

Name

Description

Lam Res No States

Resistance with laminar flow.

Var Lam Res No States

Resistance with laminar flow and externally commanded conductance.

Orifice No States

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 Poly No States

The component describes both flow regimes, using an interpolation polynomial.

Sim Ori No States

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

Metering Ori No States

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

Two Orifices

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

Orifice N

Same as Orifice No States, but with the equations rearranged to compute dp for given q.

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

General Parameters

Name

Default

Units

Description

Modelica ID

&Delta;Tsystem

0

K

Temperature offset from system temperature

dT_system

orif

[1]

 

Orifice dimension

orif

Transition

1

 

Transition model

Transition

k1

10

 

Laminar part

k1

k2

2

 

k2&equals;1Cd2

k2

Cd

1k2

 

Max discharge coefficient

C_d

λc

2k1k2

 

Critical flow number

lambdac

0.003

m

Orifice length; 1<d

length

pnom

106

Pa

Nominal pressure drop

pnom

qnom

1.89·10-5

m3s

Nominal volume flow rate

qnom

ρnom

865

kgm3

Nominal density

rhonom

d

0.001

m

Orifice diameter

diameter

area

0.001

m2

Orifice area

area

[1] Hydraulics.Restrictions.Basic.PressureDrop.orifinput.D

Constant Parameters

Name

Default

Units

Description

Modelica ID

flowcond

1

 

Flow condition

flowcond

reg type

0

 

Regularization type

regtype

reg param

0

 

Regularization parameter

regparam

cavitation

true

 

Cavitation

cavitation

checkvalve

false

 

 

checkvalve

trans

0

 

Transition Reynolds number

Re_trans

ptrans

0

Pa

Transition pressure

p_trans

pclosed

0

Pa

Cracking pressure

p_closed

Gleak

0

m3sPa

Leakage conductance

G_Leak

Cd

Cd_eq

 

 

Cd

Constants

Name

Value

Units

Description

Modelica ID

&alpha;[k]

0.649

 

 

alpha_k

See Also

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


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