Thermal Fluctuation Characteristics around a Nanosecond Pulsed Dielectric Barrier Discharge Plasma Actuator using a Frequency Analysis based on Schlieren Images

Abstract

A thermal fluctuation driven by a burst plasma discharge is experimentally investigated using a frequency analysis based on the Schlieren images. The burst plasma discharge is controlled by an interval frequency fint = 200 Hz and a pulse frequency fB = 3.6 kHz as well as the duration time of the burst event: Ton. A burst feature is defined as a burst ratio BR = Ton/(1/fint). The burst plasma discharge generates a burst-induced hot plume growing above a ground electrode. In a high burst ratio, which is BR = 0.45 and 0.57, the burst-induced hot plume is formed as a wave thermal pattern that is mainly fluctuated at the interval frequency of 200 Hz. Additionally, a maximum fluctuation spot of 200 Hz appears near the edge of an exposed electrode in a low burst ratio, whereas it moves towards the ground electrode in the high burst ratio. The possible scenario is that a relatively strong ionic wind and/or an induced jet generated in the high burst ratio might cause the movement of the maximum fluctuation spot.

The Use of Spatially Multi-Component Plasma Structures and Combined Energy Deposition for High-Speed Flow Control: A Selective Review

“…In [75], L. Rajendran et al investigated the length and time scales of filamentary surface plasma discharge in the context of using nanosecond surface dielectric barrier discharge (NS-SDBD) actuators for high-speed flow control in supersonic and hypersonic conditions. These actuators utilize short nanosecond high-voltage pulses to rapidly energize the electrode gap (see [76] T. Ukai and K. Kontis analyzed thermal fluctuations around NS-DBD plasma actuators using schlieren-based frequency analysis [78]. These thermal fluctuations are critical for effective flow control in high-speed flows.…”

“…pronounced three-dimensionality during the experiments, necessitating the corresponding volumetric velocity and density field measurements. T. Ukai and K. Kontis analyzed thermal fluctuations around NS-DBD plasma actuators using schlieren-based frequency analysis [78]. These thermal fluctuations are critical for effective flow control in high-speed flows.…”

Mean model of the dielectric barrier discharge plasma actuator including photoionization

“…This type of actuators, demonstrate superior effectiveness to the other types at high Reynolds and Mach numbers. The literature on experimental investigations of optical, electrical, thermal and mechanical characterizations of NS-pulsed DBDs is not very rich [9][10][11][12][13][14][15]; even fewer studies can be found on the numerical modeling of this process [16][17][18]. Comprehensive reviews on DBD applications in EHD can be found in [5,[19][20][21][22].…”

Highly responsive multi-flow pattern generation by multi-electrode plasma actuator using a single power supply

“…Moreover, the complexity of such equipment makes it expensive, thereby hindering its commercial application. Actuators with such characteristics are expected to have extensive applicability in the active control of gas mixing [41], thermal diffusion [42][43][44], fluctuating-flow field feedback [45] phenomena, and boundary layer control [46,47]. However, no such actuators have been developed to date.…”