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Old   August 31, 2012, 05:21
Default Emergency help Frozen rotor connection
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Mehdi Bahador
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Hello all,
I'm simulating one passage of turbine + 360 degree diffuser in a model. I would like to use frozen rotor connection between blade outlet and diffuser inlet. My problem is that when I put pitch ratio (it is 63), cfx just stretching the one passage data over diffuser inlet surface and doesn't copy the inlet data 63 time over diffuser surface. I need a emergency help on this issue, please let me know if some body has an idea to solve the problem.Thanks in advance.
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Old   August 31, 2012, 06:00
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Hi,
First what is the need of a full 360 degree model of diffuser if you are using only a sector of rotor, since if flow is axisymmetric in rotor it should be in diffuser, if its not in diffuser it shouldn't be in rotor. Other I dont know how it has to be done.
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Old   August 31, 2012, 07:02
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Are you sure your pitch ratio is correct? Rather than 63 have you tried 1/63?
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Old   August 31, 2012, 07:04
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Hello, Thanks for the response, there are some sturts in diffuser and flow in the diffuser in not axisymmetric, in addition exit flow in turbine passage is not axisymetric, I know what you mean, but I can not model all the turbine passages becasue my model will be so heavy and by this way I will have a inlet profile very close to diffuser inlet.
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Old   August 31, 2012, 07:06
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I put 63 for the pitch, I haven't used 1/63, but I can try with that too,
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Old   August 31, 2012, 08:03
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I tried with 1/63 but it has the same problem, I also tried automatic pitch change but it doesn't work.
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