MapleSim Hydraulics Library from Modelon - MapleSim Help

Online Help

All Products    Maple    MapleSim


Home : Support : Online Help : MapleSim Toolboxes : MapleSim Hydraulics Library from Modelon : Pumps : Basic : ModelonHydraulics/Pumps/Basic/VarPump

MapleSim Hydraulics Library from Modelon

Var Pump  Pump with variable input displacement and volumetric efficiency

This component describes an ideal pump with constant displacement.

Implementation

The flow rate (q) is given by:

q = Dpump  w  volumetricEfficiency / (2  π)

If the inlet pressure is lower than the atmospheric pressure, the delivered flow rate becomes smaller. Flow from port_A to port_B is considered positive.

Variables used in the above equation

q

Flow rate at the outlet port m3s

Dpump

Displacement per revolution m3

w

Angular velocity rads

volumetricEfficiency

Volumetric Efficiency (0-1)

Assumptions

Ideal pump with constant displacement (that is, no losses included).

 

Equations

Variables

Connections

Parameters

Equations

T=T0oil+ΔTsystem

n=30wπ

q=mflowAρoilpAabs,T,vair=vgasoil,psat=psat

q=qidealVE

w=tφa

Δp=pAlimitedpBlimited

φa=φb

pAabs=pA+patmoil

pAlimited=maxpA,pvapouroilpatmoil

pBabs=pB+patmoil

pBlimited=maxpB,pvapouroilpatmoil

qideal=12Dpumpwπ

12ΔpDpumpπ=flange_a.tau+flange_b.tau

mflowA+mflowB=0

Variables

Name

Value

Units

Description

Modelica ID

Δp

 

Pa

Pressure drop

dp

pAlimited

 

Pa

Limited gauge pressure

pA_limited

pBlimited

 

Pa

Limited gauge pressure

pB_limited

pAabs

 

Pa

Absolute pressure

pA_abs

pBabs

 

Pa

Absolute pressure

pB_abs

q

 

m3s

Flow rate at connector A

q

w

 

rads

Angular velocity of pump shaft

w

T

 

K

Local temperature

T

pAsummary

pA

Pa

Pressure at port A

summary_pA

pBsummary

pB

Pa

Pressure at port B

summary_pB

Δpsummary

Δp

Pa

Pressure drop

summary_dp

qsummary

q

m3s

Flow rate flowing into port_A

summary_q

Pmechsummary

[1]

W

Mechanical Rotational Power

summary_MP

Phydsummary

Δpq

W

Hydraulic Power

summary_HP

psat

[2]

Pa

Gas saturation pressure

p_sat

n

 

1min

Pump rpm

n

qideal

 

 

Ideal flow

q_ideal

[1] ϕ.aτa+ϕ.bτb

[2] oil.gasSaturationPressureT,oil.vgas

Connections

Name

Description

Modelica ID

portA

Port A, where oil flows into the component (0<q, pB<pA means 0<&Delta;p)

port_A

portB

Port B, where oil leaves the component (q<0, pB<pA means 0<&Delta;p)

port_B

flangea

 

flange_a

flangeb

 

flange_b

oil

 

oil

VE

 

volumetricEfficiency

Dpump

 

Dpump

Parameters

Name

Default

Units

Description

Modelica ID

&Delta;Tsystem

0

K

Temperature offset from system temperature

dT_system

See Also

Pumps

MapleSim Hydraulics Library from Modelon Overview

 


Download Help Document

Was this information helpful?



Please add your Comment (Optional)
E-mail Address (Optional)
What is ? This question helps us to combat spam