等离子体激励器表面电荷沉积机理与激励器优化设计

项目名称： 等离子体激励器表面电荷沉积机理与激励器优化设计

项目编号： No.11472221

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 数理科学和化学

项目作者： 蔡晋生

作者单位： 西北工业大学

项目金额： 85万元

中文摘要： 基于介质阻挡放电的等离子体激励器在控制流动分离，增升减阻，抑制气动噪声等方面具有极好的应用前景。为了突破激励器诱导流动的速度瓶颈，掌握不同气压条件特别是高空低气压环境下等离子体激励的规律，有必要对等离子体激励的物理机理进行深入研究。激励器放电中介质表面电荷沉积与放电空间中电子时空分布是有关等离子体激励机理的关键问题。本项目拟通过放电起始电压与介质表面电荷的关系来研究表面电荷沉积机理，并通过发射光谱研究电子的时空分布，从而建立能够准确反映等离子体激励器放电发展的电路模型，电路模型可用于指导激励器优化设计。在上述激励器流动机理研究的基础上，提出宽气压范围内（0.2-1.0 atm）等离子体激励器的几何与物性参数的优化方案，并进行实验验证。通过本项目的研究将能够掌握等离子体激励器表面电荷的沉积规律，从而实现宽气压范围内激励器的优化设计。

中文关键词： 流动控制；等离子体激励；优化设计；表面电荷沉积；介质阻挡放电

英文摘要： Dielectric barrier discharge plasma actuator has powerful prospective applications in flow separation control, lift augmentation and drag reduction, and aeroacoustic noise suppression, etc. To breakthrough the bottleneck of velocity the actuator induces, and master the rule that the plasma actuator stimulates flows under different ambient pressures, especially in the environments of high altitude and low pressures, it is necessary to perform an intensive investigation into the physical mechanisms by which the plasma actuation works. In actuator discharging, the charges on the dielectric surface and the electron density distribution in discharge space are key problems associated with the plasma actuation mechanisms. The present program is to study the electron accumulation on the dielectric surface through the relation between the onset voltage of the discharge and the charges on the dielectric surface, and investigate the tempo-space distribution of the electron by detecting the optical emission spectroscopy of argon, the tracing gas, thus set up a circuit model of the plasma actuator which can accurately reflect the evolution of the discharging process. Based on the above-mentioned mechanisms, the project will propose a program for the optimization of the geometric and physical parameters of the plasma actuator within 0.2 -1.0 atm, and conduct the validation experiments inside a vessel. The accumulation rule of charges on the plasma actuator surface will be revealed through this research work in the present project, and then the design optimization of the actuator within wide-range atmospheric pressures can be realized.

英文关键词： Flow control;Plasma acuator;Design optimization;Surface charges accumulation;Dielectric barrier discharge