Frame and Pitch Change

rajiitb · July 9, 2012, 15:25

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, 08:22

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, 08:36

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

keeper · July 11, 2012, 09:26

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

rajiitb · July 11, 2012, 09:31

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, 09:59

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

rajiitb · July 11, 2012, 10:06

Thank you for all the replies,

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

July 9, 2012, 15:25	Frame and Pitch Change	#1
rajiitb New Member Raj Join Date: Jul 2012 Posts: 4 Rep Power: 14	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 Svetlana likes this.

July 11, 2012, 08:22		#2
keeper Senior Member Join Date: Jul 2010 Posts: 152 Rep Power: 16	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. Svetlana likes this.

July 11, 2012, 08:36		#3
rajiitb New Member Raj Join Date: Jul 2012 Posts: 4 Rep Power: 14	I have given 'Automatic' option for pitch change... and 'stage' for framce change.. Svetlana likes this.

July 11, 2012, 09:26		#4
keeper Senior Member Join Date: Jul 2010 Posts: 152 Rep Power: 16	have you checked overlapping areas on this interface? I mean area of each interface... Svetlana likes this.

July 11, 2012, 09:31		#5
rajiitb New Member Raj Join Date: Jul 2012 Posts: 4 Rep Power: 14	The area of each interface is different, bcoz rotor 1 has 8 blades (we have small model) and rotor 2 have 9 blades. Svetlana likes this.

July 11, 2012, 09:59		#6
keeper Senior Member Join Date: Jul 2010 Posts: 152 Rep Power: 16	then try to specify pitch angles (45deg on side 1 and 40 on side 2) Svetlana likes this.

July 11, 2012, 10:06		#7
rajiitb New Member Raj Join Date: Jul 2012 Posts: 4 Rep Power: 14	Thank you for all the replies, I will simulate using your suggestion and lets see if it sorts the problem. Svetlana likes this.

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