The challenge of time-resolved flow investigation of a one-stage centrifugal compressor with a non-symmetric volute

In the framework of H2020 Cleansky2 project ROSSINI an industrial centrifugal compressor stage including vaneless diffuser and a non-symmetric volute is investigated with regard to development flow instabilities rotating stall.Due complex path geometry sophisticated instrumentation concept was developed allowing for combined high resolution field unsteady pressure investigation. This paper aimed at summarizing challenges steps taken during rig design in terms integrating non-intrusive, measurement sensors access optical techniques such as time-resolved PIV L2F investigate phenomena stall inception occurring part speed operation. Results performance measurements surge testing will be presented compared CFD simulations numerical twin stage.A deeper understanding that might precurser would help predict unstable operation already phase, today commonly supported by analysis providing data information early process.