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Axial and centrifugal compressors in the same engine

 
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ckuhns



Joined: 13 Jul 2003
Posts: 31

PostPosted: Sat Oct 12, 2019 17:12    Post subject: Axial and centrifugal compressors in the same engine Reply with quote

I have noticed that some turbo shaft and turbo prop engines have both a axial and centrifugal compressor. Any reason for this type of construction? A few examples of this are the P & W PT6 series, Lycoming T53 and the Allison/ Rolls -Royce 250.
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kmccutcheon



Joined: 13 Jul 2003
Posts: 213
Location: Huntsville, Alabama USA

PostPosted: Sun Oct 13, 2019 19:09    Post subject: Reply with quote

Please note that all of these are relatively small-diameter gas turbines. Centrifugal first stages are used because they can be relatively small and still achieve a 4X compression whereas an axial stage typically produces about 1.2X. This doesn't work with larger-diameter compressors because the large impeller's weight, structural considerations and tip speeds become prohibitive.
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Kimble D. McCutcheon
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