Development of Serrated Multi-Electrode Plasma Actuators for Enhanced Force Production

47th AIAA Plasmadynamics and Lasers Conference

2016

Self Cite

Recently, dielectric barrier discharge plasma actuator (DBDPA) is actively researched as an active flow control devices. However, the induced flow is too slow to be installed on the aerodynamic bodies to control a high-speed flow. To this problem, DualGrounded Tri-Electrode plasma actuator (DGTEPA) was suggested as a solution which can make stronger flow with better efficiency. So in this research, we investigate the discharge structure and body force field of the conventional DBDPA and the DGTEPA by a plasma simulation to clarify the mechanism that the DGTEPA gains its performance. First, we evaluated the validity of the simulation results. Although there are some quantitative and qualitative discrepancies, we confirmed they are almost qualitatively in agreement with the experiments. Second, we discussed about the distribution of the plasma density and confirmed that there is another discharge occurs near the third electrode of the DGTEPA. In addition, when the third electrode is close enough to the AC electrode edge, the plasma near the third electrode is supplied to the near region of the AC electrode edge. Last of all, we examined the body force distribution and we found there are strong body force regions in where the high density plasma exists. Also when the third electrode is close enough to the AC electrode edge, the body force is drastically enhanced because of the expansion of a discharge region near the AC electrode edge. NomenclatureD e , D p , D n e = elementary charge = diffusion coefficient for electron, positive ion and negative ion E f = body force vector = electric field vector j e , j p , j n r = electron, positive ion and negative ion number density ep r = recombination coefficient between electron and positive ion pn t = time = recombination coefficient between positive ion and negative ion p = ambient pressure v e α = ionization coefficient = mean velocity of electron ε 0 , ε r γ = secondary electron emission coefficient = electric permittivity in the vacuum and relative electric permittivity of the dielectric μe, μp, μn = time index during navigation η = attachment coefficient σ = surface charge density 1 Student of Master Course, 2-24-16, Nakacho, Koganei, Tokyo, 184-8588, JAPAN, Mechanical System Engineering, Student Member AIAA.

Section: Introductionmentioning

confidence: 98%

Basic Study on the Voltage Characteristic of Dual-Grounded Tri-Electrode Plasma Actuator by Plasma Simulation

Nakano

47th AIAA Plasmadynamics and Lasers Conference

2016

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“…Especially, a tri-electrode plasma actuator was proposed and reported to achieve drastic performance improvement. The thrust force is up to ten times larger than that of the conventional type (Moreau et al, 2008, Matsuno et al, 2016, Nishida, et al, 2017. It has an additional exposed electrode on the opposite side of the AC-high-voltage electrode, and DC high voltage is applied to the third electrode.…”

Section: Introductionmentioning

confidence: 99%

Investigation on performance characteristics of dielectric discharge plasma actuator using pulsed-dc waveform

Nakai

Oshio

2018

JFST

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Dielectric Barrier Discharge Plasma Actuator (DBDPA) is one of active flow control devices, which generates a wall-surface jet utilizing atmospheric discharge. However, the enhancement of the jet is indispensable for application to high Reynolds number flow because the flow speed is typically only up to several meters per second. In recently, it was reported that a Pulsed-DC voltage waveform can drastically improve the jet thrust (McGowan et al., 2016). In the Pulsed-DC waveform, the high DC voltage rapidly drops to zero and gradually recover. In the original idea, the DC high voltage is applied to the top electrode and the Pulsed-DC waveform is applied to the bottom electrode. In this study, firstly, we conduct experiments using the same method proposed by the previous study, and next, the DBDPA, in which the top electrode is powered by the Pulsed-DC waveform and the bottom electrode is electrically grounded, is investigated. Finally, we propose a new waveform which is a sinusoidal voltage with periodical pulsed-earthing. As a result, the DBDPA with Pulsed-DC voltage waveform cannot generate strong wall-surface jet, and on the other hand, the proposed waveform generates a significant jet. Even though its strength is the same magnitude as that by the simple sinusoidal waveform, it is confirmed that the jet thrust is enhanced at phases before and after the pulsed-earthing; the tentative thrust increment is up to 32 %.

“…A tri-electrode plasma actuator (TED-PA) has been proposed to drastically improve performance. [11][12][13][14] Figure 1(b) shows the schematic configuration of the TED-PA. It has two air-exposed electrodes mounted on each side of a dielectric; a high-voltage alternating current (AC) is applied to one electrode, and the other electrode is energized by a highvoltage direct current (DC).…”

Section: Introductionmentioning

confidence: 99%

“…When a negative DC voltage is applied to the DC electrode, the TED-PA generates a discharge phenomenon called "sliding discharge"; ionized air covers the entire area between the AC and DC electrodes. [11][12][13] Sliding discharge was initially developed for laser pumping applications 15) and has been studied for preionization of species since many year ago. [15][16][17] Moreau et al first utilized it as plasma actuator aiming to expand the plasma region of momentum exchanges, 11) and Sosa et al reported that sliding discharge results from a combination of two discharges around the AC and DC electrodes, and the morphologies of the AC and DC discharges are largely affected by the voltages applied.…”

Section: Introductionmentioning

confidence: 99%

“…18) TED-PAs are garnering considerable interest because experimental studies have reported that they enable a significant improvement in performance to be achieved: a TED-PA can induce a jet that is 10.6 times stronger and improve electrical efficiency sixfold that of a conventional DBDPA. 13) The TED-PA is a promising solution from the viewpoint of thrust force. On the other hand, the jet induced by a TED-PA has unique behavioral characteristics: it is vertically deflected when a higher DC voltage is applied, as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Development of Engineering Model Providing Body Force Distribution of Tri-Electrode Plasma Actuator

Nakai

Trans. Japan Soc. Aero. S Sci.

Asaumi

et al. 2019

Self Cite

Tri-electrode plasma actuators (TED-PAs) can induce a stronger jet than that of conventional two-electrode plasma actuators (DBDPAs). For practical application of a TED-PA, it is significant to develop a TED-PA engineering model for implementing CFD simulations. In this study, we model the body force distribution generated by a TED-PA utilizing the Suzen model, which is one of engineering models used for DBDPAs. First, we define a function to describe the charge distribution profile on the dielectric surface with two half-Gaussian distributions. Second, we define the maximum values of surface charge as functions of the voltage applied based on the plasma simulation results. Finally, the flow fields numerically obtained using the model developed are compared with the experimental results from our previous study. Although there are some discrepancies mainly due to the two-dimensional laminar flow simulation, the model developed can quantitatively reproduce the voltage characteristics of thrust force and the jet structure induced. Therefore, the model developed is expected to evaluate the flow control effect precisely.