Parametric study on the characteristics of a SDBD actuator with a serrated electrode

Abstract

Active flow control based on surface dielectric barrier discharge (SDBD) has become a focus of research in recent years, due to its unique advantages and diverse potential applications. Compared with the conventional SDBD with straight electrodes, the serrated electrode-based SDBD has a great advantage due to its 3D flow topology. It is believed that the boundary layer separation of moving objects can be controlled more effectively with this new type of SDBD. In SDBD with a serrated electrode, the R (tip sharpness) and N (tip number per unit length) have a great influence on the discharge and induced airflow characteristics. In this paper, a parametric study of the characteristics of SDBD with a serrated electrode has been conducted with different ranges of R and N. Aspects of the power consumption, the steady medium temperature distribution, and the maximum induced airflow velocity have been investigated. The results indicate that there is a critical value of R and N where the maximum power consumption and induced airflow velocity are achieved. The uniformity of the steady temperature distribution of the medium surface is found to be more dependent on N. We found that the accelerating effects of the induced airflow can be evaluated with the Schlieren technique, which agree well with the results from the pitot tube.

Two‐dimensional particle‐in‐cell/Monte Carlo simulations of streamer formation and propagation in catalyst pores in a surface dielectric barrier discharge

“…The S-DBD has a thin structure for plasma generation, thus could limit flow resistance, and is generally used for gas flow control [9][10][11] and gas purification [12] in industrial applications. One of the commonly used configurations is that two electrodes are offset from each other and submerged by the dielectric plate in S-DBDs, [11,[13][14][15][16][17][18][19][20][21][22] as a result, the plasma discharge is performed on one side of the dielectric layer in a single-phase S-DBD. [11,21,23] For the purposes of flow control and gas treatment, increased attention has been put into controlling the plasma behaviors in a singlephase S-DBD.…”

Influence of segmented grounding electrodes on electrical characteristics in annular surface dielectric barrier discharge

“…The structural configuration of SDBD is the most prominent factor that distinguishes its different applications. For example, its efficacy in airflow control and anti-icing tasks is determined by its configuration parameters, including the constituent dielectric materials and thickness [9][10][11], the configuration of the actuator [3,[12][13][14][15][16], and the electrode geometries [2,[17][18][19][20][21][22][23][24]. For example, the actuators with symmetrically arranged electrodes and a multi-SDBD plasma actuator with several long single stripes are used for effective flow control or anti-icing [25,26].…”

Dielectric barrier discharge plasma actuators applied to high-lift devices for aerodynamic noise reduction

“…Since the plasma is formed at the edge of the exposed electrode, when it has a serrated geometry, there is a higher concentration of charges in the region where the plasma is generated in relation to the straigth electrodes. (CROCE, 2014;GAO et al, 2017). According to Thomas et al (2009), due to this higher electric field strength at the serrated points, plasma ignition occurs earlier in these geometries, but the saturation voltage is not altered by the serrated edge.…”

“…This features could be useful to some applications. 2017According to Thomas et al (2009), Wang and Roy (2011), Croce 2014, Belan and Messanelli (2015) and Gao et al (2017), compared to traditional straight electrodes of the same size, serrated electrodes produce a three-dimensional flow generating a thicker and more intense jet ( Figure 15). Gao et al 2017performed a parametric study of plasma actuators with serrated electrodes, varying the parameters of tip sharpness and number of tips per unit length, verifying their influence on the maximum induced wind velocity, power consumption and average temperature.…”

“…To some extent, the reduction in the number of tips per unit length leads to an induced speed increase, until it reaches a peak. After this value, an additional reduction of the number of tips leads to a reduction of the induced velocity, because with the increase of the gap, more energy is absorbed by the increase of the impedance and less by the momentum transform (GAO et al, 2017).…”