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| 1 | Experimental characteristics of a two-electrode plasma synthetic jet actuator array in serial显示文摘Plasma Synthetic Jet(PSJ) actuators have shown wide and promising application prospects in high-speed flow control, due to their advantages including high exhaust speed, wide frequency band, rapid response, and non-moving components. Although previous studies on PSJ actuators are abundant, most of them have focused on the performance of a single actuator. However, in practice, an actuator array is very necessary for large-scale aerodynamic actuation on account of the small affected area of a single PSJ. In this paper, the characteristics of a twoelectrode plasma synthetic jet actuator array in serial are investigated experimentally. Compared to a parallel actuator array, the serial actuator array requires simpler power supply design and is much easier to realize. High-speed photography of the discharge evolution, voltage-current measurement, and shadowgraphy visualization are used in the investigation. Experimental results show that, for the serial actuator array, weak discharges happen firstly between energized and suspending electrodes, and then a strong pulse arc discharge is triggered. The breakdown voltage in serial is irrelevant to such factors as the number of actuators, the maximum or minimum gap in serial,the connection sequence, etc. It is mainly determined by the sum of gaps. For serial actuators with the same anode-to-cathode spacing, the energy deposition is the same, and the jet is synchronous and similar. Because of the entrainment and merging of adjacent jet vortices, the jet front speed of an aligned synchronous jet array increases as the orifice distance decreases. To achieve the highest jet front velocity, the orifice of the actuator has an optimal diameter. | Yan ZHOU Zhixun XIA Zhenbing LUO Lin WANG Xiong DENG | 2018 | Chinese Journal of Aeronautics2018，31，12： | 9 |
| 2 | 主动扭转旋翼振动载荷减缓控制优化显示文摘为降低旋翼前飞状态的桨毂振动载荷水平,应用主动扭转旋翼技术,开展最优控制方案研究。建立基于中等变形梁理论的旋翼气动弹性动力学模型,以预测稳态飞行的桨毂振动载荷。使用UH-60A直升机旋翼算例验证所建模型准确性并作为研究基准。通过谐波相位及幅值变参分析,研究单谐波扭转控制对振动载荷的影响。构建基于遗传算法的主动扭转旋翼控制参数优化框架,开展展向一致多谐波扭转控制参数优化与分段多谐波扭转控制方案优化。结果表明:优化的多谐波扭转控制相比单谐波主动扭转控制可起到更好的桨毂振动载荷减缓效果。而以桨叶中点为分段点的最优2段扭转控制方案,通过对内外段桨叶施加不同的扭转控制规律,进一步降低了六方向的振动载荷水平。 | 张啸迟 万志强 严德 | 2023 | 北京航空航天大学学报2023，49，12： | 0 |
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