纳米复合聚酰亚胺基DBD等离子体气动激励器研究

等离子体流动控制技术具有响应快、频带宽、结构简单等优点,具有显著技术优势。介质阻挡放电(DBD)等离子体气动激励器是研究最为广泛的激励器形式,但是国际上鲜有研究关注其介质材料的寿命,这严重制约了等离子体流动控制技术的发展和应用。为解决这一问题,进行了聚酰亚(PI)/纳米复合聚酰亚胺基等离子体气动激励器实验研究。实验结果表明,纳米复合结构有利于提高激励器的导热性能,其放电区域最高温度与传统激励器相比,降低了10%~20%;发现了纳米复合聚酰亚胺基激励器的高温点自愈现象;纳米结构激励器抑制了结构损伤,从而阻止了放电功率和表面温度的快速增加;普通聚酰亚胺表面在放电老化后,形成大量孔洞、沟槽以及烧蚀痕迹,纳米复合聚酰亚胺在老化后表面出现大量的白色球形纳米粒子团簇,减轻了绝缘材料受到的侵蚀与破坏。

A Study on DBD Plasma Aerodynamic Actuator with Nanocomposite Polyimide

The aerodynamic design of new generation aircraft and engine has an important need for active flow control technology. The advantages of plasma flow control are fast in response, wide in frequency band, and simple in structure. Dielectric barrier discharge (DBD) plasma aerodynamic actuator is the most popular form of actuators. However, in the international work, its life characteristics is almost in a state of neglect, thus seriously restricting the development and application of plasma flow control technology. In the light of solving the scientific problem, the experimental study of PI / nanocomposite PI-based plasma aerodynamic actuator is carried out. The results show that the nanocomposite has the advantage of improving the thermal conductivity of the actuator, and the maximum temperature is 10%-20% lower than that of the traditional actuator; the self-healing phenomenon of the nanocomposite PI-based actuators is found; nanocomposite actuators inhibit structural damage, thereby preventing rapid increase in discharge power and surface temperature; after the aging of the PI surface, a large number of holes, trenches and ablation traces are formed on the surface of the PI, and a large number of white spherical nanoparticle clusters appeare on the surface of the nanocomposite PI after aging, reducing the damage of the insulating material.