| Citation: | Zhao Runhan, Zhong Jingjun, Wu Wanyang. Influence of controllable speed casing on performance of subsonic compressor stage at design rotational speed[J]. Journal of Aerospace Power, 2026, 41（9）：20250141 doi: 10.13224/j.cnki.jasp.20250141
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This study employed numerical simulations to investigate the influence of controllable speed casing treatment with different rotational directions and rotational speeds on the performance of a subsonic compressor stage. The results indicated that when the rotational direction of the rotatable ring segment rotated in the same direction as the rotor, an increase in rotational speed led to a reduction in both the stable operating margin and peak efficiency. The rotatable ring segment exerted a reverse force to the tip leakage flow, thereby reducing the leakage flow velocity and exacerbating flow blockage of the flow channel. Conversely, when the rotational direction of the rotatable ring segment rotated opposite to the rotor, an increase in the rotational speed expanded the stable operating margin. The rotatable ring segment exerted a co-directional force to the tip leakage flow, thereby increasing the leakage flow velocity and improving the flow capacity of the flow channel under near stall conditions. When the rotatable ring segment rotated at 100% of the rotor speed in the opposite direction, the stable operating margin of the compressor stage improved by 16.34%, and its pressure ratio increased by 0.12%.
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