高频交流激励表面介质阻挡放电特性及其应用

Characteristics and Applications of High-frequency AC Surface Dielectric Barrier Discharge

高频交流电激励表面介质阻挡放电在控制流动分离方面有重要应用,电压幅值与频率是关键的因素.为此,通过改变电压幅值及频率,获得了电流、电压波形,以及放电图像.并将研究表面介质阻挡放电特性激励器应用于S1223翼型,在风洞中进行了流动控制实验.实验表明：随电压幅值的增大,电流幅值及每mm激励器消耗功率增大,放电宽度以及放电亮度增加;频率改变几乎不影响暴露电极向植入电极一侧放电,频率增大却可以降低双侧放电强度;通过在翼型表面布置表面介质阻挡放电激励器,可以达到抑制翼型流动分离,提高翼型升力系数的效果;翼型攻角在0＆#176;～4＆#176;与10＆#176;～25＆#176;下等离子体对翼型升力系数均能起到增效作用,而且表面介质阻挡放电对流动分离的控制效果与电压幅值有关,该文实验条件下7 kV时对翼型升力系数的增效最大,可达61.8％.

Surface dielectric barrier discharge （SDBD） excited by high-frequency alternating current could be quite usefulin controlling flow separation, while the applied voltage＇s amplitude and frequency are two critical factors. Hence, weexperimentally obtained the current and voltage waveforms, as well as discharge images of SDBD exited by voltages withdifferent amplitudes and frequencies. The experimental SDBDB actuator was also applied in S1223 airfoil to carry outflow control experiments in wind tunnel. The experimental results show that with increasing amplitude of the appliedvoltage, both the current amplitude and power consumption per mm of the actuator increase, and the discharge width anddischarge brightness also increase. Voltage frequency change hardly affects the discharge from the exposed electrode tothe side of the implanted electrodes, but with increasing frequency, the bilateral discharge gets weaker. Planting SDBDactuators on the surface of S1223 airfoil can inhibit airfoil flow separation and improve the coefficient of lift. For theairfoil with angel of attack at 0-4 degrees and 10-25 degrees, SDBD plasma increases the lift coefficient of airfoil,meanwhile, its controlling effect on flow separation varies with the applied voltage. Under our experimental conditions,when the applied voltage＇s amplitude is 7 kV, the lift coefficient of the S1223 airfoil is increased by 61.8%.