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Journal Articles Mechanics & Industry Year : 2014

Aerodynamic instabilities in transonic centrifugal compressor

Abstract

This paper presents the analysis of the instabilities inception in a transonic centrifugal com-pressor for different rotation speeds. The analysis was conducted from experimental results obtained with unsteady pressure sensors implanted in the inducer, vaneless diffuser and vaned diffuser. Beyond the stability limit the compressor enters into a deep surge without any precursor, whatever the speed. The surge process is initiated in the vaned diffuser by a massive boundary layer separation. For low speeds, together with the surge which remains triggered in the diffuser, aerodynamic instabilities are detected in the inducer. These instabilities can be understood as “tip clearance rotating disturbances” because they are generated at the leading edge of the impeller main blades and move along the tip clearance trajectory.
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Dates and versions

hal-01296904 , version 1 (11-04-2016)

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Nicolas Buffaz, Isabelle Trébinjac. Aerodynamic instabilities in transonic centrifugal compressor. Mechanics & Industry, 2014, 15, pp.191-196. ⟨10.1051/meca/2014023⟩. ⟨hal-01296904⟩
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