Aerodynamic instabilities in transonic centrifugal compressor. (6th June 2014)

• Record Type: Journal Article
• Authors: Buffaz, N.; Trebinjac, I.
• Is Part Of: Mechanics & industry. Volume 15:Number 3(2014)
• Page Start: 191
• Page End: 196
• Publication Date: 2014-06-06
• Subjects: Mechanical engineering -- Periodicals; Industrial engineering -- Periodicals; Machinery -- Periodicals; 620.1
• DOI: 10.1051/meca/2014023
• Languages: English
• ISSNs: 2257-7777

Abstract

<abstract abstract-type="normal" xml:lang="en"> <title> <x content-type="archive" xml:space="preserve">Abstract</x> </title> <p>This paper presents the analysis of the instabilities inception in a transonic centrifugal compressor 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. </p> </abstract>