WOLFRAM

WOLFRAM SYSTEM MODELER

FixedTurbulentThrottle

Turbulent restriction

Diagram

Wolfram Language

In[1]:=
SystemModel["Hydraulic.Valves.FlowControl.FixedTurbulentThrottle"]
Out[1]:=

Information

This model with lumped volumes describes turbulent flow. The flow is defined by the equation:



where
:Mass flow rate
:Fluid density
:Discharge coefficient
A:Opening area
:Pressure difference between ports a and b

Implementation

The flow equation is linearized for pressure differences near zero to increase numerical stability.

Limitations

This model is only valid for turbulent flow. No checks are made if it is physically possible that the flow through the component actually is turbulent.

Reference

K. Gieck and R. Gieck, Engineering Formulas, 7th ed., Germering, Germany: Gieck Publishing, 1997 p. N7.

Parameters (4)

medium

Value: Oil()

Type: Medium

Description: Medium in the component
A

Value: 0.001

Type: Area (m²)

Description: Area of the orifice opening
Cd

Value: 0.62

Type: Real

Description: Coefficient of discharge for orifice
V

Value: 0.0001

Type: Volume (m³)

Description: Volume of component

Connectors (2)

port_b

Type: Port_b

Description: Port for hydraulic fluid (unfilled icon)
port_a

Type: Port_a

Description: Port for hydraulic fluid (filled icon)

Components (4)

medium

Type: Medium

Description: Medium in the component
restrictionTurbulent

Type: RestrictionTurbulent

Description: Turbulent restriction
volume_a

Type: Volume

Description: Fixed volume with fluid storage
volume_b

Type: Volume

Description: Fixed volume with fluid storage

Used in Examples (3)

MeterIn

Hydraulic.Examples.FlowControl

Example circuit with meter-in flow control

MeterOut

Hydraulic.Examples.FlowControl

Example circuit with meter-out flow control

BleedOff

Hydraulic.Examples.FlowControl

Example circuit with bleed-off flow control