ROTATING STALL IN CENTRIFUGAL COMPRESSOR VANELESS DIFFUSER: EXPERIMENTAL ANALYSIS AND PHENOMENON CHARACTERIZATION

摘要

The rotating stall is a key problem for achieving a good working range of a centrifugal compressor. A detailed understanding of the phenomenon is very important to anticipate and avoid it. Starting from these considerations General Electric -Nuovo Pignone (Florence) and the Department of Energy Engineering "S. Stecco" (University of Florence), has planned wide ranging experimental research focused on the diffuser rotating stall of the high-pressure compressor family. A test rig was instrumented with many fast response dynamic pressure sensors so as to characterize inception and evolution of the rotating stall and its influence on stage performance. This kind of analysis was carried out on both in time and in frequency domains. The methodology used and the results on phenomenon evolution will be presented and discussed in this paper.