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Centrifugal compressor

Centrifugal compressor

(OP)
Is it true that the first stage impeller of a centrifugal is always unshrouded while the other stages can have shrouded impellers? what is the reason for having an open first stage impeller?

RE: Centrifugal compressor

No. Most centrifugal compressors have fully enclosed impellers in the first stage.

Johnny Pellin

RE: Centrifugal compressor

The advantage of an open impeller is the reduction in stresses which helps increase the max tip speed. In other words, you could have a high head first stage.


To the others:
Are these open first stage impellers used mainly on high MW machines with high 1st stage flow coefficients?



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