Effect of bleed slots on turbocharger centrifugal compressor stability

摘要

Bleed slots located in the inducer region of centrifugal compressors have been demonstrated to extend the surge margin with minimal negative impact on performance. This paper describes the impact of bleed slots on surge margin enhancement in a turbocharger centrifugal compressor used for heavy duty diesel engines. The study included evaluation of pressure instabilities throughout the compressor map, characterization of dynamic phenomena occurring at low mass flow rates (mfr), and elucidation of the impacts of bleed slots on the compressor stability and surge line.