Effects of electrical parameters on the performance of a plasma swirler

Abstract

Effects of electrical parameters on the flow characteristics of a plasma swirler are investigated. Through the accumulation of plasma induced acceleration, the azimuthal velocity is amplified when the fluid particles flow out of the plasma swirler. Numerical simulation is carried out to investigate the distribution of the azimuthal velocity and calculate the swirl number. The swirl number increases almost linearly with the increase of the electrode length until it reaches its maximum at the end of the electrodes. Fluid velocity distribution is quantitatively measured and analyzed using particle image velocimetry and laser Doppler anemometry. The higher the applied voltage is, the larger the flow divergence tends to be. With the increase of the applied voltage, the flow in the central region is modified, leading to the potential of flow control by adjusting the applied voltage.

Development of a small-scale helical surface dielectric barrier discharge for characterizing plasma–surface interfaces

“…Others have shown alternative in situ DRIFTS configurations, including a plasma jet embedded on the dome [31,32] and a cylindrical DBD generated within a ceramic crucible [33]. We chose an approach that drew inspiration from 2D surface DBDs used in plasma actuators [22][23][24] and plasma swirlers [25], where both of the electrodes are in contact with a dielectric surface. However, in order to increase the surface area of the plasma, we expanded the surface DBD into 3D using a helical configuration.…”

“…Therefore, it is necessary to develop a DBD to work within the small dimensions (on the order of millimeters) required by the geometry, and one that could be easily integrated and removed. The design, which we term a helical surface DBD and illustrated as embedded within a DRIFTS reactor in figure 1, is inspired by surface DBD configurations often employed in plasma actuators for fluid dynamics applications, such as for drag reduction [22][23][24], plasma swirlers for improving the stability of flames and efficiency in combustion [25], and in ionic wind devices [26]. However, rather than using a 2D surface common in plasma actuators, the helical surface DBD uses the 3D surface of a cylinder as its dielectric, allowing for a higher plasma coverage and in this case, an improved interaction with the surrounding solid media.…”

The Applications of Plasma Techniques II

“…Although vortex breakdown should be suppressed on a delta wing, it is commonly adopted in combustion and acts as a stabilizer to enhance reactant mixing and stabilization of the flame by recirculating hot gases into its base. Inspired by the idea of accelerating the same fluid particles continuously, we designed a plasma swirler with the electrode placed in the streamwise direction [50]. The plasma swirl injector is effective in diffusion and premixed flame control [51,52], and can be integrated into a low swirl injector to control the flame lift off height accurately [53,54].…”

Spin manipulation and decoherence in a quantum dot mediated by a synthetic spin–orbit coupling of broken T-symmetry

“…In other words, the micromagnet and the associated s-SOC open new spin decoherence channels. Various aspects of s-SOC-enabled decoherence have been explored previously, such as spin relaxation [19,26,27,29] and dephasing [7,28,30], and effects of the magnetic noise from the micro-magnets [31,32]. However, there is still a lack of theoretical understanding on how the apparent difference in the form between s-SOC and the intrinsic SOC (i-SOC) directly leads to wide ranging differences in both spin coherence and control in QD systems.…”