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

Frame and Pitch Change

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

Reply
 
LinkBack Thread Tools Display Modes
Old   July 9, 2012, 14:25
Smile Frame and Pitch Change
  #1
New Member
 
Raj
Join Date: Jul 2012
Posts: 4
Rep Power: 4
rajiitb is on a distinguished road
Hi all,

I am simulating a contra-rotating compressor in CFX ansys , and for the interface between two rotors (rotating at 3600 rpm) I have used "stage" model for Frame change and pitch change, the no of blades are also different in both rotors.

I am finding a Total pressure loss of around 15% of what my rotors are producing at the interface , can someone suggest a solution for this

Thanks in advance
rajiitb is offline   Reply With Quote

Old   July 11, 2012, 07:22
Default
  #2
Senior Member
 
Join Date: Jul 2010
Posts: 142
Rep Power: 6
keeper is on a distinguished road
which pith change type did you use? the best way is to set it up to automatic if you don't know pitch angles directly.
keeper is offline   Reply With Quote

Old   July 11, 2012, 07:36
Default
  #3
New Member
 
Raj
Join Date: Jul 2012
Posts: 4
Rep Power: 4
rajiitb is on a distinguished road
I have given 'Automatic' option for pitch change... and 'stage' for framce change..
rajiitb is offline   Reply With Quote

Old   July 11, 2012, 08:26
Default
  #4
Senior Member
 
Join Date: Jul 2010
Posts: 142
Rep Power: 6
keeper is on a distinguished road
have you checked overlapping areas on this interface? I mean area of each interface...
keeper is offline   Reply With Quote

Old   July 11, 2012, 08:31
Default
  #5
New Member
 
Raj
Join Date: Jul 2012
Posts: 4
Rep Power: 4
rajiitb is on a distinguished road
The area of each interface is different, bcoz rotor 1 has 8 blades (we have small model) and rotor 2 have 9 blades.
rajiitb is offline   Reply With Quote

Old   July 11, 2012, 08:59
Default
  #6
Senior Member
 
Join Date: Jul 2010
Posts: 142
Rep Power: 6
keeper is on a distinguished road
then try to specify pitch angles (45deg on side 1 and 40 on side 2)
keeper is offline   Reply With Quote

Old   July 11, 2012, 09:06
Default
  #7
New Member
 
Raj
Join Date: Jul 2012
Posts: 4
Rep Power: 4
rajiitb is on a distinguished road
Thank you for all the replies,

I will simulate using your suggestion and lets see if it sorts the problem.
rajiitb is offline   Reply With Quote

Reply

Tags
cfx 13, frames 3d cfx, pitch

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
Wind turbine simulation Saturn CFX 34 October 16, 2014 05:27
Pitch and frame change Andy QUB ANSYS 4 July 8, 2010 05:10
RPM in Wind Turbine Pankaj CFX 9 November 23, 2009 04:05
More Rotating reference frame problems DaveG CFX 2 October 26, 2005 16:47
Stage Interface Without Frame Change Vikram CFX 2 October 21, 2005 04:55


All times are GMT -4. The time now is 15:31.