| Abstract: | Using a plexiglas plate model,the performance of peristaltic flow acceleration induced by multiple DBD(dielectric barrier discharge)plasma actuators was studied based on PIV(particle image velocimetry).The asynchronous and the duty cycle pulsed actuation modes were proposed and tested.The velocity fields induced by multiple DBD plasma actuators with different phase angles and duty cycle ratios were acquired and the momentum transfer characteristics of the flow field were discussed.Consequently,the mechanism of the peristalsis-acceleration multiple DBD plasma actuation was analyzed.The results show that the peristaltic flow acceleration effect of multiple plasma actuators occurs mainly in paraelectric direction,and the mechanism of peristaltic flow acceleration is ejection pushing effect rather than injection pumping effect.The asynchronous and the duty cycle pulsed actuation modes can,with energy consumption increase of merely 10%,achieve 65%and 42%increase of downstream velocity,and thus are promising in velocity improvement and energy saving. |
