Transactions of Nanjing University of Aeronautics & Astronautics
Improvement of Stability of a High-Loaded Axial Flow Compressor by a Combined Flow Control Method
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Abstract:
This study investigates a high-loaded axial compressor in which flow instabilities in the rotor and the stator occur almost concurrently. Under these conditions， conventional stability enhancement methods prove to be ineffective. The paper proposes a combined rotor-stator flow control technique. This study reveals that the flow field deterioration stems from combined flow blockage at the rotor tip region and the near-hub region of the stator. Research on flow control methods finds that self-recirculating casing treatment can effectively improve flow capacity in the rotor tip region， but simultaneously reduce flow capacity in the near-hub zone. This makes the hub flow field more susceptible to breakdown and ultimately triggers compressor instability. Thus， the self-recirculating casing treatment fails to enhance stall margin. By contrast， hub suction significantly improves the hub-region flow field. Yet without suppressing the rotor-tip flow blockage， it achieves limited stability enhancement. The integrated solution combining self-recirculating casing treatment with hub suction simultaneously addresses flow blockage at both the rotor tip and the stator near-hub regions. This combined flow control method delivers effective stability enhancement， achieving 6.78% increase in compressor stall margin.
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V231
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