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Centrifugal Compressor Surge Analysis

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Old   March 18, 2020, 01:53
Question Centrifugal Compressor Surge Analysis
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Mikael
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Hello guys,

I want to find surge line for the compressor I designed. I followed the method in the article below. Doi number for the article is : doi:10.4271/2015-01-1280.

https://sci-hub.tw/10.4271/2015-01-1280

In this method, mass flow outlet and pressure inlet boundary conditions are used and transient calculations are performed. Method says that you can find the surge starting point for a speedline by reducing mass flow outlet boundary condition steadily with a constant slope as you can see in the attached figure 1.

Method follows that criteria for surge start is increase in pressure ratio flactuations and reach 0.05 standard deviation in average pressure ratio value. You can see the figure about this criteria at attached file 2.

I followed the method described. However, I could not get satisfactory results and I am not sure if this method is true or not.

What is your opinion about this method ? Is there anybody to perform surge analysis on CFX ? Which method did you follow ?

Thanks in advance,

Best regards.
Attached Images
File Type: png mfr time dep.PNG (99.2 KB, 27 views)
File Type: jpg pr_stdev_rawdata.jpg (37.3 KB, 25 views)

Last edited by mikaeldomingo; March 18, 2020 at 05:33. Reason: Attachment File
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Old   March 18, 2020, 05:18
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Glenn Horrocks
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I don't click on links to strange websites. Post images and text files as attachments directly to the forum.

Have you read the CFX Best Practises Guide? I think it describes the CFX recommended way of doing this.
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Old   March 18, 2020, 05:37
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Hi, I attached images as thumbnails, but I could not attach pdf due to oversize. So, I added doi number of the article.
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Old   March 18, 2020, 17:18
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The best way to answer your question is to do some research. I recommend you have a look in the CFX Reference manual for the best practises guides as that contains the recommended approach for many simulations. Also do a search of the CFX documentation on "surge", I think you will find some references you will be interested in looking at which show alternate approaches.

In other words, RTFM.
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Old   March 19, 2020, 00:20
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I read the manual. However, my question is not explicitly answered in the manual. I found some articles which each of them suggest different approaches. As you know, transient simulations take lots of time so that I cannot try all of them. That is why I write here. Perhaps, there is someone in this forum who is/was interested in surge phenomena that I could benefit. That is how know-how transfered.

Thanks for your reply.
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Old   April 7, 2020, 05:19
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hello
you'd better to use average static pressure in outlet near the choke masss flow rates and use outlet mass flow rate near the surge points.
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cfx, compressor, stall, surge, transient

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