NDLI: Unsteady and Three-Dimensional Flow Phenomena in a Transonic Centrifugal Compressor Impeller at Rotating Stall

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Iwakiri, Kenichiro Furukawa, Masato Ibaraki, Seiichi Tomita, Isao
Copyright Year	2009
Abstract	This paper presents a combined experimental and numerical analysis of rotating stall in a transonic centrifugal compressor impeller for automotive turbochargers. Stall characteristics of the compressor were examined by two high-response pressure transducers mounted on the casing wall near the impeller inlet. The pressure traces were analyzed by wavelet transforms to estimate the disturbance waves quantitatively. Three-dimensional unsteady internal flow fields were simulated numerically by Detached Eddy Simulation (DES) coupled LES-RANS approach. The analysis results show good agreements on both compressor performance characteristics and the unsteady flow features at the rotating stall. At stall inception, spiral-type breakdown of the full-blade tip leakage vortex was found out at some passages and the brokendown regions propagated against the impeller rotation. This phenomenon changed with throttling, and tornado-type separation vortex caused by the full-blade leading edge separation dominated the flow field at developed stall condition. It is similar to the flow model of short-length scale rotating stall established in an axial compressor rotor.
Sponsorship	International Gas Turbine Institute
Starting Page	1611
Ending Page	1622
Page Count	12
File Format	PDF
ISBN	9780791848883
DOI	10.1115/GT2009-59516
e-ISBN	9780791838495
Volume Number	Volume 7: Turbomachinery, Parts A and B
Conference Proceedings	ASME Turbo Expo 2009: Power for Land, Sea, and Air
Language	English
Publisher Date	2009-06-08
Publisher Place	Orlando, Florida, USA
Access Restriction	Subscribed
Subject Keyword	Leakage Wavelet transforms Blades Stall inception Rotors Compressors Unsteady flow Separation (technology) Flow (dynamics) Pressure Rotation Waves Performance characterization Compressor impellers Internal flow Numerical analysis Simulation Reynolds-averaged navier–stokes equations Impellers Vortices Eddies (fluid dynamics) Turbochargers Pressure transducers
Content Type	Text
Resource Type	Article

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