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-   -   Frame and Pitch Change (http://www.cfd-online.com/Forums/cfx/104434-frame-pitch-change.html)

rajiitb July 9, 2012 14:25

Frame and Pitch Change
 
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

keeper July 11, 2012 07:22

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.

rajiitb July 11, 2012 07:36

I have given 'Automatic' option for pitch change... and 'stage' for framce change..

keeper July 11, 2012 08:26

have you checked overlapping areas on this interface? I mean area of each interface...

rajiitb July 11, 2012 08:31

The area of each interface is different, bcoz rotor 1 has 8 blades (we have small model) and rotor 2 have 9 blades.

keeper July 11, 2012 08:59

then try to specify pitch angles (45deg on side 1 and 40 on side 2)

rajiitb July 11, 2012 09:06

Thank you for all the replies,

I will simulate using your suggestion and lets see if it sorts the problem. :)


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