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Frame and Pitch Change

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Old   July 9, 2012, 15:25
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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
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Old   July 11, 2012, 08:22
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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.
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Old   July 11, 2012, 08:36
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I have given 'Automatic' option for pitch change... and 'stage' for framce change..
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Old   July 11, 2012, 09:26
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have you checked overlapping areas on this interface? I mean area of each interface...
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Old   July 11, 2012, 09:31
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The area of each interface is different, bcoz rotor 1 has 8 blades (we have small model) and rotor 2 have 9 blades.
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Old   July 11, 2012, 09:59
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then try to specify pitch angles (45deg on side 1 and 40 on side 2)
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Old   July 11, 2012, 10:06
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Thank you for all the replies,

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