The number of stall cells and their rotational speed are distinctive features of the rotating stall phenomenon and play an important role in the prediction and analysis of the pressure fields during rotating stall. Various aspects of numbers and speed of stall cells are analyzed using an original interpretation method based on the pressure distribution in the circumference of a specific transverse cross-section at a specific time. This characteristic is similar to that of the pressure variation with time at a certain location on the compressor circumference. In some cases, the number of stall cells in any transverse cross-section may be defined after graphing the phase of pressure oscillation versus sensor positions and their joint analysis with the pressure signal variations in time and space. It is shown that whereas the numbers of stall cells in different transverse cross-sections of a multistage compressor may vary, the pressure field rotational speeds and accordingly the rotation speeds of all stall cells seem to be the same.

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