Study of axial groove casing treatment for co-flow jet micro-compressor actuators

Kewei Xu, Gecheng Zha

Research output: Chapter in Book/Report/Conference proceedingConference contribution


This paper conducts numerical trade study of the axial groove (AG) casing treatment for micro-compressor actuators used for Co-Flow Jet (CFJ) active flow control. The purpose is to increase the stall margin for the micro-compressors while minimizing the design point efficiency penalty. Three geometrical parameters are varied for the trade study, including: width, length and skew angle. The numerical approach is validated with a tested micro-compressor using recirculating casing treatment. A very good agreement is achieved between the predicted speedlines and the measured results for the validated micro-compressor. For the width study, wide width with W/P of 60% possesses a higher stall margin improvement (SMI) of 10.1%, but an increased design point efficiency penalty of 4% also occurs. To preserve micro-compressor efficiency, the width W/P of 30% is adopted that has SMI of 3.1% with efficiency reduced by only 1.1%. Decreasing AG length to 0.7C (chord) results in a reduction of efficiency penalty while maintaining a similar SMI. However, a further decrease of AG length to 0.6C significantly hurts stall margin and reduces SMI by half. For the skew angle study, 52.5 is the optimal angle for AG to extract tip flow, which substantially enhances flow re-circulation and mitigates tip blockage. Overall, the optimum AG has the upstream point located at 0.2C ahead of LE and downstream point at 0.5C after the LE and has a W/P of 30%, a length of 0.7C with a skew angle of 52.5. The micro-compressor with the optimum AG configuration is able to improve stall margin by 7.4% with a design point efficiency penalty of 0.6%.

Original languageEnglish (US)
Title of host publicationAIAA Scitech 2021 Forum
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
Number of pages15
ISBN (Print)9781624106095
StatePublished - 2021
EventAIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2021 - Virtual, Online
Duration: Jan 11 2021Jan 15 2021

Publication series

NameAIAA Scitech 2021 Forum


ConferenceAIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2021
CityVirtual, Online

ASJC Scopus subject areas

  • Aerospace Engineering


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