It is very welcome to see papers appearing with results obtained on the superb compressor facility in the Technical University of Dresden. One feels confident that these have been obtained to the highest standards in a machine that models the flow in high-performance compressors.

I am less happy about some aspects of the paper. I believe that the phenomenon that is the basis of this paper, which the authors call “rotating instability,” is part-span rotating stall. This phenomenon is very common in high-speed multistage axial compressors in which the front stages quite normally go into a multicell, part-scan rotating stall when the machine is operating at speeds below the design value. This phenomenon was described in some detail in the famous NACA report “The Aerodynamic Design of Axial Flow Compressors,” first published in 1956 1. The present authors are quite mistaken to say that...

1.
NACA, 1956, “The Aerodynamic Design of Axial Flow Compressors,” NACA TN 3662.
2.
Mathioudakis and Breugelmans, 1985.
3.
Silkowski, 1995.
4.
Koch, C. C., 197▪.
5.
Kameier, 1994.
6.
Day, I. J., 1976, “Axial Compressor Stall,” PhD Dissertation, University of Cambridge, United Kingdom.
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