Stall margin improvement in a low-speed axial compressor rotor using a blockage-optimised single circumferential casing groove

Mustaffa, A F and Kanjirakkad, V (2020) Stall margin improvement in a low-speed axial compressor rotor using a blockage-optimised single circumferential casing groove. GPPS Chania20, Online conference, 7-9 September 2020. Published in: Proceedings of Global Power and Propulsion Society. 1-10. GPPS ISSN 2504-4400

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Abstract

The stall margin of tip-critical axial compressors can be improved by using circumferential casing grooves. From previous studies, in the literature, the stall margin improvement due to the casing grooves can be attributed to the reduction of the near casing blockage. The pressure rise across the compressor as the compressor is throttled intensifies the tip leakage flow. This results in a stronger tip leakage vortex that is thought to be the main source of the blockage. In this paper, the near casing blockage due to the tip region aerodynamics in a low-speed axial compressor rotor is numerically studied and quantified using a mass flow-based blockage parameter. The peak blockage location at the last stable operating point for a rotor with smooth casing is found to be at about 10% of the tip chord aft of the tip leading edge. Based on this information, an optimised single casing groove design that minimises the peak blockage is found using a surrogate-based optimisation approach. The implementation of the optimised groove is shown to produce a stall margin improvement of about 5%.

Item Type: Conference Proceedings
Keywords: Axial Compressor, Stall Margin Improvement, Blockage, Optimisation
Schools and Departments: School of Engineering and Informatics > Engineering and Design
Research Centres and Groups: Thermo-Fluid Mechanics Research Centre
Subjects: T Technology > TJ Mechanical engineering and machinery > TJ0266 Turbines. Turbomachines (General)
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Depositing User: Ahmad Fikri Bin Mustaffa
Date Deposited: 28 Sep 2020 11:23
Last Modified: 30 Oct 2020 15:17
URI: http://sro.sussex.ac.uk/id/eprint/94030

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