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采用粒子图像测速(Particle Image Velocimetry,PIV)技术,研究了介质阻挡放电等离子体激励对NA-CA0015翼型表面流动分离的控制特性及控制效果随时间历程的变化规律。结果表明,激励电压存在一个阈值,当电压小于阈值时,控制无效或效果不明显;当电压接近阈值时,控制表现出不稳定性并最终趋于稳定;当电压大于阈值时,控制效果稳定且显著,气流能够很好地重附在翼型表面。
Particle Image Velocimetry (PIV) technique was used to study the control characteristics and the variation of control effect over the course of time on the surface flow separation of NA-CA0015 airfoil with dielectric barrier discharge plasma excitation. The results show that there is a threshold for the excitation voltage. When the voltage is less than the threshold, the control is ineffective or the effect is not obvious. When the voltage approaches the threshold, the control shows instability and eventually stabilizes. When the voltage is greater than the threshold, the control effect is stable Significantly, the airflow is well attached to the airfoil surface.