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Nilesh
Commentator
India - Member - New Member

Join Date: Aug 2008
Posts: 61
Good Answers: 1

IGV - Centrifugal Compressor

07/14/2009 3:30 AM

Dear All,

I am just thinking How & why we are getting different performance curves with IGV Angle +10 and (-) 10 degree.

As at 0 (Zero) degree - IGV will be fully open.

Now, I move +/- 10 Degree on both side, IGV Opening area will remain same, than why we have diff. operating curves.

What I have observed is, (For Fixed values of Diff. head), Capacity will increase for IGV Position +10 degree, 0 degree to (-) 10 Degree.

How can It be possible, If the IGV Opening is same at both +10 and (-)10 degree IGV Position.

Requesting experts to share your views.

With regards,

Nilesh.
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Anonymous Poster
#1

Re: IGV - Centrifugal Compressor

07/14/2009 11:36 PM

It is not a simple case of open and closed, you are changing the angle of attack for the rotor inlets.

Incidentally, the whole purpose of IGV's is to reduce efficiency to avoid a surge condition.

Check the manufaturers specification for operating curves. (who is the manufacturer? Compressor model number?)
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Nilesh
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India - Member - New Member

Join Date: Aug 2008
Posts: 61
Good Answers: 1
#2
In reply to #1

Re: IGV - Centrifugal Compressor

07/15/2009 1:04 AM

Kindly elaborate How it works to get diff. operating points (means operating curves).

Regards,
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Gadget Guy
Associate

Join Date: Jan 2007
Location: Los Angeles, California
Posts: 35
Good Answers: 3
#3

Re: IGV - Centrifugal Compressor

07/15/2009 9:04 AM

"Guest" was correct in mentioning that the vane position changed the angle of attack of the incoming gas. The "Pre-rotation swirl" created by on of the IGV positions meant that the gas had less directional change at the impeller inlet, and therefore slightly higher efficiency
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ejruiza
Active Contributor

Join Date: May 2008
Location: coatzacoalcos, veracruz mexico
Posts: 12
#4

Re: IGV - Centrifugal Compressor

07/15/2009 4:15 PM

which are the opertion conditions th igv, must operate +10 or -10, the angle of the vane insn't same in both cases check it

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