PIV Study on Ensemble and Phased-Locked of Periodic-Pulsed Dielectric-Barrier-Discharge over A Conical Forbody
Particle image velocimetry (PIV) has been used to study vortex and velocity flowfield. The plasmainduced flow near a 20° cone surface in the absense of external flow at one atmospheric air is investigated. Four modes of operations of the starboard actuators support this investigation. The effects of pluse duty ratio and pluse frequency on the induced maximum crossflow velocity and maximum axial vorticity are compared with those of steady discharge. Under pulsed actuation the unsteadiness of the induced flow is significant in the flow physics, therefore, besides the ensemble-averages, phase-lockedaverages are examined. Experimental results indicate at appropriate pulse frequency, the effects of the steady plasma actuation are higher than those of the periodic pulsed actuations. The phaselocked-averaged maximum crossflow velocity and maximum magnitude of axial vorticity induced by periodic-pulsed discharge are larger than those of the corresponding ensemble averages,the main mechanism of momentum transfer under steady actuation is the formation of strong discrete vortices, rather than the gas acceleration.
PIV techniques plasma conical forbody periodic-pulsed discharge
Ma Chong Li Huaxing Liu Feng Luo Shijun
National Key Laboratory of Science and Technology on Aerodynamic Design and Research,Northwestern Po The Department of Mechanical and Aerospace Engineering University of California, CA 92697-3975,Ameri
国际会议
2010 Asia-Pacific International Symposium on Aerospace Technology(2010 亚太航空航天技术研讨会 APISAT 2010)
西安
英文
232-235
2010-09-01（万方平台首次上网日期，不代表论文的发表时间）