GPPS-TC-2020_AC_89.pdf (1.33 MB)
Stall margin improvement in a low-speed axial compressor rotor using a blockage-optimised single circumferential casing groove
conference contribution
posted on 2023-06-09, 21:42 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%.
History
Publication status
- Published
File Version
- Published version
Journal
Proceedings of Global Power and Propulsion SocietyISSN
2504-4400Publisher
GPPSPublisher URL
External DOI
Page range
1-10Event name
GPPS Chania20Event location
Online conferenceEvent type
conferenceEvent date
7-9 September 2020Series
GPPS Chania20Department affiliated with
- Engineering and Design Publications
Research groups affiliated with
- Thermo-Fluid Mechanics Research Centre Publications
Full text available
- Yes
Peer reviewed?
- Yes