Stall margin improvement.pdf (867.1 kB)
Stall margin improvement in a low-speed axial compressor rotor using a blockage-optimised single circumferential casing groove
journal contribution
posted on 2023-06-09, 23:45 authored by Ahmad Fikri Bin Mustaffa, Vasudevan KanjirakkadVasudevan KanjirakkadThe 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%.
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Publication status
- Published
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- Published version
Journal
Journal of the Global Power and Propulsion SocietyISSN
2515-3080Publisher
Global Power and Propulsion SocietyExternal DOI
Volume
5Page range
79-89Pages
89.0Department affiliated with
- Engineering and Design Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2021-05-05First Open Access (FOA) Date
2021-05-05First Compliant Deposit (FCD) Date
2021-05-05Usage metrics
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