Study for Application of Background Oriented Schlieren Method to Flow Induced by DBD Plasma Actuator

Kaneko, Yutaka; Emori, Kenta; Nakano, Asa; Oshio, Yuya; Shimazaki, Takaaki; Tagawa, Yoshiyuki; Nishida, Hiroyuki

doi:10.2514/6.2020-1817

Cited by 2 publications

(3 citation statements)

References 15 publications

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“…Note that the low-frequency bias voltage itself could not ignite the plasma jet in the absence of the high-frequency pulses and this mechanism only plays a role in controlling and amplifying the produced jet. The wall jet speed strongly depends on bias voltage as well as on the surface charge on the dielectric, [29,35,36] and the same effect can have a major impact on enhancement the plasma jet. In general, in SDBD structures, a jet is formed like a thin wall that is approximately parallel to the surface.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, the high-frequency power supply as the main actuator and the low-frequency power supply as the bias voltage and corona wind amplifier have been employed. In this study, the Schlieren method, which is a type of imaging process used to detect and record changes in fluid current density, [28,29] employs to capture the behaviour of argon plasma jet in the above conditions and also the dynamical parameters for more insight into the effect of low-frequency sinusoidal bias were used. Finally, the increase in metal substrate (stainless steel) hydrophilicity by applying of the desired plasma jet has been investigated.…”

Section: Introductionmentioning

confidence: 99%

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The effect of modulated electric field on characteristic of SDBD‐like plasma jet for surface modification

Seyfi

Heidari

Khademi

et al. 2020

Contributions to Plasma Physics

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In this paper, the dynamics and flow behaviour of an atmospheric argon plasma jet was studied in the new nozzle structure similar to the surface dielectric barrier discharge (SDBD) using the Schlieren imaging method. The effect of plasma jet driven by repetitive high-voltage microsecond pulses with low-frequency sinusoidal bias was measured qualitatively in a single mirror Schlieren optical system. The enhancement of plasma jet length and cross-section of plasma jet with surface in this condition is due to highly turbulent flow of argon plasma jet in this structure. This study revealed the important role of SDBD structure and modulated electric field on the behaviour of plasma jet in a high diameter nozzle. In practice, this technique allows us to increase the jet length of the nozzle output to 5 cm and under these conditions, the diameter of the plasma jet cross-section is increased to 8 mm, without increasing the electrical power consumption. Eventually, the hydrophilicity of the surface is also measured by the contact angle of a water droplet that decreases from 78 • to 8 • after surface treatment, implying we were able to reach a super-hydrophilic surface with this plasma jet structure. K E Y W O R D S hydrophilicity, modulated electric field, plasma jet, Schlieren imaging, surface dielectric barrier discharge (SDBD)

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The effect of modulated electric field on characteristic of SDBD‐like plasma jet for surface modification

Seyfi

Heidari

Khademi

et al. 2020

Contributions to Plasma Physics

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show abstract

“…However, they only obtained the density gradients and quantified the plasma-induced temperature field. Later, Kaneko et al [57,58] investigated the effects of the depth of field, wall surface, and background image deformation on measurements of the near-surface density field in DBD plasma actuators. They also investigated the errors associated with the measurements of density variation fields generated by plasma actuators and confirmed that the BOS technique allows for obtaining valid results.…”

Section: Introductionmentioning

confidence: 99%

Development of a Background-Oriented Schlieren (BOS) System for Thermal Characterization of Flow Induced by Plasma Actuators

et al. 2023

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Cold climate regions have great potential for wind power generation. The available wind energy in these regions is about 10% higher than in other regions due to higher wind speeds and increased air density. However, these regions usually have favorable icing conditions that lead to ice accumulation on the wind turbine blades, which in turn increases the weight of the blades and disrupts local airflow, resulting in a reduction in wind turbine performance. Considering this problem, plasma actuators have been proposed as devices for simultaneous flow control and deicing. These devices transfer momentum to the local airflow, improving the aerodynamic performances of the turbine blades while producing significant thermal effects that can be used to prevent ice formation. Considering the potential application of plasma actuators for simultaneous flow control and deicing, it is very important to investigate the thermal effects induced by these devices. However, due to the significant electromagnetic interference generated by the operation of these devices, there is a lack of experimental techniques that can be used to analyze them. In the current work, a background-oriented Schlieren system was developed and is presented as a new experimental technique for the thermal characterization of the plasma-induced flow. For the first time, the induced flow temperatures are characterized for plasma actuators with different dielectric materials and different dielectric thicknesses. The results demonstrate that, due to the plasma discharge, the temperature of the plasma-induced flow increases with the increase of the applied voltage and may achieve temperatures five times higher than the room temperature, which proves the potential of plasma actuators for deicing applications. The results are presented and discussed with respect to the potential application of plasma actuators for simultaneous flow control and deicing of wind turbine blades.

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Study for Application of Background Oriented Schlieren Method to Flow Induced by DBD Plasma Actuator

Cited by 2 publications

References 15 publications

The effect of modulated electric field on characteristic of SDBD‐like plasma jet for surface modification

The effect of modulated electric field on characteristic of SDBD‐like plasma jet for surface modification

Development of a Background-Oriented Schlieren (BOS) System for Thermal Characterization of Flow Induced by Plasma Actuators

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