CFD Analysis to explain the Operating range extension observed during Operation in Co-rotating Mode of a Twin-impeller Centrifugal Compressor

Centrifugal compressors are widely used in many industrial applications because of their advantages. However, these turbomachines suffer at a low-flow rate from instabilities, such as rotating stall and surge. That leads to operational failure, pressure fluctuations vibrations the thorough system. Many mechanical solutions minimize instabilities expand operating range towards rates like active control flow path, variable inlet guide vane casing treatment. Currently, our team has developed new compressor composed twin-impeller powered by autonomous systems. We notice performance improvement suppression this experimentally. In paper, CFD study is presented explain some experimental observations analyzing inside twin-impeller, structures thermodynamic characteristics low co-rotating mode. Numerical results measurements maps consistent.