Intelligent control of slender-body asymmetric vortices using a wide-sector DBD plasma actuator

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Abstract
Asymmetric vortices over slender bodies at high angles of attack can generate large side forces and degrade flight stability. Here, a reinforcement-learning-based closed-loop plasma control method is proposed and validated online in wind tunnel tests. A wide-sector dielectric-barrier-discharge plasma actuator generates oblique wall jets, while pressure-derived side-force feedback is used to adapt the actuation parameters autonomously in real time. A centerline paired-difference method is further introduced to quantify leeward pressure imbalance from circumferential pressure measurements. Under the present conditions, closed-loop control outperforms both steady and open-loop actuation by suppressing the dominant leeward positive-vorticity structure, reducing the mean pressure difference from 0.807 to 0.241 and decreasing the side-force coefficient from 0.57 to 0.16. These results demonstrate the feasibility of real-time pressure-feedback plasma control for adaptive suppression of slender-body asymmetric vortices at high angles of attack.
Funding Information
  • National Natural Science Foundation of China (61971345)
  • National Natural Science Foundation of China (52550007)
  • National Natural Science Foundation of China (52277167)
  • China Scholarship Council Scholarship Program (202508610256)
  • Key Research and Development Projects of Shaanxi Province (2024ZDKY17)

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