【作者】 傅鑫；

【导师】 栗保明；

【作者基本信息】 南京理工大学 ， 工程力学， 2007， 博士

【摘要】 本文以速度边界层流动控制为背景,以空气大气压条件下沿面放电低温等离子体流动控制为研究对象,以提高控制效果降低功耗为目的,以实验研究为主要手段,研究了各放电参数与低温等离子体以及低温等离子体流动控制效果间的关系。为了优化了等离子体激活板,获得功耗最小的激活板结构,本文进行了大气压条件下沿面放电的低温等离子体进行的放电特性研究、发射光谱研究以及其诱导的近壁面速度分布研究等三项单项实验研究。认为电极间隙ｄ=0 mm时控制效果最理想。同样为了减小功耗,本文通过适当的理论分析,讨论了进一步降低功耗的技术途径。在国内首次提出运用多路移相电源提高等离子体流动控制效率并进行了实验研究,将优化的等离子体激活板贴敷于NACA 0015翼型表面,测量了8路移相驱动电源激活的等离子体在翼型表面诱导的速度分布,在大量实验数据的基础上获得了速度分布的经验公式,为进一步数值分析提供了模型。在以上单项研究的基础上,搭建了200 mmx300 mm低速风洞,将贴敷了等离子体激活板的NACA 0015翼型置于其中进行了吹风试验,获得了边界层分离后重新附着的流场显示,并测量了翼型阻力,分析了等离子体驱动电源参数对阻力减小效果的影响规律。吹风试验分别运用单路和八路移相电源激活等离子体激活板,实验结果证明八路电源能够以较低的电压较小的功耗获得与单路电源相同的效果。最后将速度分布表达式加入Fluent软件中进行了数值模拟,可以发现其结果与实验结果基本一致。更多还原

【Abstract】 This paper sets Velocity Boundary Layer Flow Control as its study field, and particularly focuses on the flow control mechanism via the one atmosphere low temperature surface discharge plasma. On the approach of acquiring a higher control efficiency at a lower power expense, experiment results play the most important role in revealing the relationship between respective discharging parameters and the low-temperature plasma’s actuated volume, as well as the latter’s flow-control performance.In order to optimize the plasma-actuating panel’s physical structure for minimizing the power consumption, the researchers started with three experiments respectively on plasma’s discharging characteristics, its emission spectrum, and the induced surface velocity profile. These experiments suggested electrodes gap, d, be set at 0 mm for the best flow control performance. In the next step, technical possibilities for minimizing power consumption were discussed from a theoretical perspective. After that, the researchers proposed, for the first time in China, applying multi-phased power source to enhance the plasma flow control efficiency and actualized it in experiment. The optimized actuating panel, driven by an eight-phased power source, was mounted on a NACA 0015 air foil, and the induced surface velocity profile was assessed. At last, an empirical formula on velocity profile was made from large quantities of experimental data and might act as a model for further numerical analysis.Based on results of the aforementioned experiments, the researchers set up a 200 mm×300 mm low-speed wind tunnel in which the plasma-actuating panel was mounted on a NACA 0015 air foil. In the subsequent wind-blowing experiments, the profile of the re-attached boundary layer flows was depicted, the drag force upon the air foil was detected, and the impact of the driving power’s parameters upon the plasma’s drag-reducing performance was analyzed. One-phased and eight-phased power sources were respectively applied to the actuating panel, and comparative data demonstrated that the eight-phased power excelled the other in cost of voltage and power when giving out the same actuating performance. The velocity profile expression was incorporated in numerical stimulation by Fluent, and the computed results were in accordance to the data collected in experiments.更多还原