Post-stall behaviour of a multi-stage high speed compressor at off-design conditions

[+] Author and Article Information
Fanzhou Zhao

Department of Mechanical Engineering, Imperial College London, London, SW7 2AZ, UK

John Dodds

Rolls-Royce plc, PO Box 31, Derby, DE24 8BJ, UK

Mehdi Vahdati

Department of Mechanical Engineering, Imperial College London, London, SW7 2AZ, UK

1Corresponding author.

ASME doi:10.1115/1.4041142 History: Received July 27, 2018; Revised August 08, 2018


Stall followed by surge in a high speed compressor can lead to violent disruption of flow, damage to the blade structures and, eventually, engine shutdown. A knowledge of unsteady blade loading during such events is crucial in determining the aeroelastic stability of blade structures, experimental test of such events is however significantly limited by the potential risk and cost associated. Numerical modelling, such as unsteady CFD simulations, can provide a more informative understanding of the flow field and blade forcing during post-stall events, however very limited publications, particularly concerning multi-stage high speed compressors, can be found. The aim of this paper is to demonstrate the possibility of using CFD for modelling full-span rotating stall and surge in a multi-stage high speed compressor, and, where possible, validate the results against experimental measurements. The paper presents an investigation into the onset and transient behaviour of rotating stall and surge in an 8-stage high speed axial compressor at off-design conditions, based on 3D URANS computations, with the ultimate future goal being aeroelastic modelling of blade forcing and response during such events. By assembling the compressor with a small and a large exit plenum volume respectively, a full-span rotating stall and a deep surge were modelled. Transient flow solutions obtained from numerical simulations showed trends matching with experimental measurements. Some insights are gained as to the onset, propagation and merging of stall cells during the development of compressor stall and surge.

Rolls-Royce plc
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