CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > CFX

compressor simulate output area condition setting

Register Blogs Members List Search Today's Posts Mark Forums Read

Like Tree3Likes
  • 1 Post By evcelica
  • 1 Post By Martin_Sz
  • 1 Post By Blanco

Reply
 
LinkBack Thread Tools Display Modes
Old   June 30, 2014, 23:27
Default compressor simulate output area condition setting
  #1
New Member
 
Cafard
Join Date: Jun 2014
Posts: 19
Rep Power: 2
Cafard is on a distinguished road
Hi everybody

I want to simulate a compressor performance
I know the input pressure and the compressor rotating speed
but i don't know the output pressure or speed

how should I set the output area condition?
Cafard is offline   Reply With Quote

Old   July 2, 2014, 22:25
Default
  #2
Senior Member
 
Erik
Join Date: Feb 2011
Location: Earth (Land portion)
Posts: 440
Rep Power: 8
evcelica is on a distinguished road
Well, the pump should have a curve, so the flow will be dependent on the delta P. Whatever you model will give you one point on that curve.
Cafard likes this.
evcelica is offline   Reply With Quote

Old   July 9, 2014, 03:06
Default
  #3
Member
 
Martin_Sz's Avatar
 
Marcin
Join Date: May 2014
Location: Poland, Swiebodzin
Posts: 36
Rep Power: 2
Martin_Sz is on a distinguished road
You can define opening on the outlet
Cafard likes this.
Martin_Sz is offline   Reply With Quote

Old   July 9, 2014, 05:30
Default
  #4
New Member
 
Andrea Bianco
Join Date: Mar 2009
Location: Torino, Italy
Posts: 21
Rep Power: 7
Blanco is on a distinguished road
If you are referring to something already tested then you should have a characteristic curve of that compressor, as evcelica said.
If this is a new design component and you want to know how good it is, than you can proceed like this:
- fix a mass flow rate at your outlet (maybe the design mass flow rate to start)
- proceed with your sim with your actual working conditions (speed, inlet pressure), again in design condition to start
- when you get the results you have to measure the pressure difference between outlet and inlet of your model. This way you have a "point" on the characteristic compressor working diagram (pressure ratio, mass flow, speed).
- Change the mass flow and repeat everything as long as you want (this point can be inverted with the next one)
- change the speed and repeat everything as long as you want

...as you can see, obtaining a compressor map from CFD simulations is a looooooong process
Cafard likes this.
Blanco is offline   Reply With Quote

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
outputTime in Swak function immortality OpenFOAM Post-Processing 6 May 20, 2013 06:43
Boundary condition setting ken87 FloEFD, FloWorks & FloTHERM 0 March 9, 2011 21:44
reference area in case of symmetry condition Micheal Main CFD Forum 1 December 24, 2008 03:14
CFX Solver Memory Error mike CFX 1 March 19, 2008 08:22
Boundary condition setting for water hammer proble yizhou FLUENT 1 October 12, 2007 12:16


All times are GMT -4. The time now is 00:13.