电压幅值和频率对表面介质阻挡放电与气动特性的影响

摘要

相比传统流动控制技术,表面介质阻挡放电(SDBD)具有响应速度快、体积较小、控制位置灵活、成本较低等优势,具有巨大的应用前景.本文在不同电压幅值和不同频率的条件下,分别进行SDBD实验,并利用纹影技术对SDBD诱导气流进行系统的比较分析.利用像素强度积分法拟合了SDBD诱导气流的速度分布,定性分析电压幅值和电源频率对诱导气流速度的影响.实验结果表明,SDBD消耗功率与电压幅值近似呈指数关系,而与频率近似呈线性关系;随着电压幅值和频率的增大,SDBD诱导气流的长度均先增加后趋于稳定;诱导气流纵向速度分布呈先上升后下降至零的趋势,其最大速度随着电压幅值和频率的增大而增大;不同电压幅值、频率下,诱导气流速度曲线均在距介质表面0.2mm附近达到最大值,几乎不随电压幅值和频率的变化而改变.%Compared with the conventional flow control technology,surface dielectric barrier discharge (SDBD) has a great application prospect due to its advantages of fast response speed,small volume,flexible control position and low cost.In this paper,SDBD discharge experiments were carried out respectively under different voltage amplitudes and frequencies.Using Schlieren diagnostic technique,a systematic comparative analysis of induced airflow under different voltage amplitudes and frequencies was conducted.Here,pixel intensity integral method was used to deduce the velocity distribution of airflow induced by SDBD.Meanwhile,the influences of voltage amplitude and frequency on the induced airflow were analyzed qualitatively.The experimental results reveal that electrical power consumption of SDBD has an exponential relationship with voltage amplitude approximately,and a linear relationship with frequency approximately.As voltage amplitude and frequency increase,the length of the induced airflow tends to be in stable after increasing.In the longitudinal direction,the velocity distribution of the induced airflow shows a trend of increasing first and then decreasing to zero,and its maximum velocity increases with the increasing of voltage amplitude and frequency.Under different voltage amplitudes and frequencies,almost all the induced airflow velocity curves reach the maximum at 0.2mm above the medium surface and hardly vary with the changes of voltage amplitude and frequency.