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Plotting Surge Curve For Variable Speed Centrifugal Compressors.


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#1 Bodhisatya

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Posted 13 July 2017 - 10:28 AM

For fixed speed compressors, plotting (Pressure ratio/Polytropic Head) v/s (flow) gives us the surge line, based on the safety margin we further draw the control line.

For VSD compressors, how to plot surge line as we have 3 variables now: Speed, Pressure ratio & flow.

Requesting Esteemed members to enlighten.

Regards

 

​Bodhisatya.



#2 Bobby Strain

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Posted 13 July 2017 - 09:25 PM

You can find that in any textbook. Or on the internet. But what is most important is that the anti-surge controller has the proper programming.

 

Bobby



#3 Bodhisatya

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Posted 14 July 2017 - 01:53 AM

You can find that in any textbook. Or on the internet. But what is most important is that the anti-surge controller has the proper programming.

 

Bobby

 

Bobby Sir

 

Thanks for replying.Sharing any link would be of great help, as I couldn't find necessary resources while browsing.

 

Regards

Bodhisatya. 



#4 Bobby Strain

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Posted 14 July 2017 - 10:13 AM

This is what you should have readily found.

 

Attached File  Pages from Centrifugal Compressors.pdf   299.9KB   14 downloads



#5 Saml

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Posted 15 July 2017 - 06:50 PM

Take a look at the article "Invariant Coordinate Systems for Compressor Control" by BW Watson.

 

The link where you can find it is:

http://proceedings.a...ticleID=2110152

 

If you plan to read it, reserve a couple of hours, it is a dense article, but well explained.

The key issue is to develop an invariant coordinate system and plot the surge line in that coordinate system.






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