Discharge and flow characterizations of the double-side sliding discharge plasma actuator

• 来源期刊: 中国物理B（英文版）
• 关键词: plasma double-side sliding discharge induced velocity induced vortex momentum analysis
• 年，卷（期）: 2020,（6）
• 页码范围: 315-327
• 页数: 13页
• 语种: 英文
• DOI: 10.1088/1674-1056/ab8624

摘要

We investigate the discharge and fl ow characterizations of a double-side siding discharge plasma actuator driven by different polarities of direct current (DC) voltage. The discharge tests show that sliding discharge and extended discharge are filamentary discharge. The irregular current pulse of sliding discharge fl uctuates obviously in the first half cycle, ultimately expands the discharge channel. The instantaneous power and average power consumptions of sliding discharge are larger than those of the extended discharge and dielectric barrier discharge (DBD). The fl ow characteristics measured by a high-frequency particle-image-velocimetry system together with high-speed schlieren technology show that the opposite jet at the bias DC electrode is induced by sliding discharge, which causes a bulge structure in the discharge channel. The bias DC electrode can defl ect the direction of the induced jet, then modifying the properties of the boundary layer. Extended discharge can accelerate the velocity of the starting vortex, improving the horizontal velocity profile by 203％. The momentum growth caused by extended discharge has the largest peak value and the fastest growth rate, compared with sliding discharge and DBD. However, the momentum growth of sliding discharge lasts longer in the whole pulsed cycle, indicating that sliding discharge can also inject more momentum.