Numerical investigation of VSVs mal-schedule effects in a threestage axial compressor

Li, Y-L. & Sayma, A. I. (2014). Numerical investigation of VSVs mal-schedule effects in a threestage axial compressor. Paper presented at the ASME Turbo Expo 2014: Turbine Technical Conference and Exposition, 16-06-2014 - 20-06-2014, Dusseldorf, Germany.

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Abstract

Variable Stator Vanes (VSVs) are commonly used in multistage axial compressors for stage matching at part load operations and during start up. Improper VSVs settings or malfunction of the controlling actuator system can lead to compressor instabilities including rotating stall and surge. It is important to be able to predict the aerodynamic behaviour of compressors in such events to either produce tolerant designs or incorporate diagnosis and recovery systems. This paper presents a numerical study of a compressor operating near the stall boundary for a mal-scheduled VSVs case. A high-speed three-stage axial compressor with Inlet Guide Vanes (IGV) is used in the investigation because of its relative simplicity and availability of geometry and aerodynamic data. A 3D RANS viscous unsteady time-accurate flow solver was used to perform the full annulus simulation with a downstream variable nozzle to control outflow boundary conditions. The unstructured mesh contained about 25 million grid points and the simulation was performed on a high performance computing cluster for many engine rotations. Rotating stall with one single cell covering several passages in all three rotors was predicted which propagated at approximately half of the shaft speed. Full analysis of the flow features is presented in the paper.

Item Type: Conference or Workshop Item (Paper)
Additional Information: http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=1907662
Uncontrolled Keywords: Multi-stage compressors; RANS; Rotating stall; Surge; VSVs; VSVs malschedule
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: School of Engineering & Mathematical Sciences > Engineering
URI: http://openaccess.city.ac.uk/id/eprint/7107

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