Unsteady Phenomena during Transient Process in Radial Vanelss Diffuser

In centrifugal compressors, diffusers are some of the main components for the pressure recovery function, and they play an important role in the performance of compressors. Generally, as flow rate reduces, compressors have a limited operation range due to rotating stall. This paper describes the unsteady process during the generation of rotating stall in a radial vaneless diffuser. The wall static pressure was measured using pressure transducer attached on the diffuser wall. The acquired data was analyzed using various DSP methods.