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马志明, 张鑫. 等离子体合成射流激励器诱导流场特性研究. 力学学报, 2024, 56(6): 1-8. DOI: 10.6052/0459-1879-24-045
引用本文: 马志明, 张鑫. 等离子体合成射流激励器诱导流场特性研究. 力学学报, 2024, 56(6): 1-8. DOI: 10.6052/0459-1879-24-045
Ma Zhiming, Zhang Xin. Flow field produced by a plasma synthetic jet actuator. Chinese Journal of Theoretical and Applied Mechanics, 2024, 56(6): 1-8. DOI: 10.6052/0459-1879-24-045
Citation: Ma Zhiming, Zhang Xin. Flow field produced by a plasma synthetic jet actuator. Chinese Journal of Theoretical and Applied Mechanics, 2024, 56(6): 1-8. DOI: 10.6052/0459-1879-24-045

等离子体合成射流激励器诱导流场特性研究

FLOW FIELD PRODUCED BY A PLASMA SYNTHETIC JET ACTUATOR

  • 摘要: 正弦交流电压激励下的介质阻挡放电等离子体合成射流激励器是一种典型的主动流动控制激励器, 具有结构简单、布置位置灵活及响应时间短等优点, 在飞行器增升减阻、抑振降噪和防/除冰等方面具有潜在的应用前景. 该激励器由两个传统的非对称布局等离子体激励器组成, 通过两个等离子体激励器诱导壁射流的相互作用, 产生一股垂直向上的射流, 从而促进高能主流与壁面附近低能气流之间的掺混, 实现流动控制. 文章针对“该激励器诱导流场时空演化过程不清”这一问题, 采用高频PIV(particle image velocimetry)技术, 在静止空气下开展了等离子体合成射流激励器诱导流场特性研究, 揭示了激励器诱导流场的时空演化过程, 发现了激励器诱导射流的振荡现象, 阐明了激励器诱导流场的演化机制. 结果表明: 激励器诱导流场经历了启动涡发展、两股射流耦合和合成射流振荡3个阶段; 激励器诱导射流的振荡角度范围能达到 ± 45°. 研究结果为完善等离子体合成射流激励器数值模拟模型和提升激励器控制效果奠定了基础.

     

    Abstract: The DBD (dielectric barrier discharge) plasma synthetic jet actuator driven by a sinusoidal alternating current high-voltage power is a typical active flow control actuator, which has the advantages of simple structure, flexible placement, and short response time. It has potential application prospects in lift enhancement and drag reduction, vibration suppression and noise reduction of aircraft, anti/de-icing. The plasma synthetic jet actuator consists of two traditional asymmetrical DBD plasma actuators which produce two wall jets. Under the interaction of the two induced wall jets, the plasma synthetic jet actuator generates a vertical upward jet, leading to promote the mixing between high-energy mainstream and low-energy airflow in the vicinity of the wall and achieve flow control. To understand the spatial-temporal evolution process of the flow field induced by the plasma synthetic jet actuator in-depth, the induced flow field was studied in quiescent air by using the time-resolved PIV (Particle Image Velocimetry) technology. The plasma actuator was placed in a Plexiglas box (600 mm in width × 600 mm in height and 800 mm in length) during the PIV experiments to ensure that the flow field produced by the plasma actuator was not disturbed by the external environment. The spatial-temporal evolution process of flow field induced by the actuator was revealed, the oscillation phenomenon of jet induced by the actuator was observed, and the evolution mechanism of flow field induced by the actuator was elucidated. The results indicated that the flow field created by the plasma synthetic jet actuator undergoes three stages, namely the development of starting vortices, the interaction of the two jets, and the oscillation of synthetic jet. Meanwhile, the induced oscillation angle range of the synthetic jet can reach ± 45 °. The present results lay a foundation for advancing the numerical simulation model and enhancing the control effect of the plasma synthetic jet actuator.

     

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