Experimental research on multichannel discharge circuit and multi-electrode plasma synthetic jet actuator

Zhang, Zhibo; Wu, Yun; Sun, Zhengzhong; Song, Huimin; Jia, Ming; Zong, Haohua; Li, Yinghong

doi:10.1088/1361-6463/aa6372

Cited by 26 publications

(17 citation statements)

References 27 publications

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“…The power of single-hole is 5.04 W, while that of multi-hole is 5.76 W. At the same pulse voltage, the power of the multi-hole bubble plasma is higher. Combined with figures 2(a) and (b), it can be inferred that the more micro holes of tube would lead to an increase of discharge channels [28,29], indicating a slight increase of current, so an increase of power can be observed.…”

Section: Characterization Of Underwater Bubble Dischargesmentioning

confidence: 68%

Comparison of the physicochemical properties and inactivation against tumor cells of PAW induced by underwater single-hole and multi-hole bubble plasma

Liu¹,

Gao²,

Pang³

et al. 2022

J. Phys. D: Appl. Phys.

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Plasma-activated water (PAW) regarded as a green alternative is of great interest in biomedicine due to the presence of a rich diversity of aqueous reactive oxygen and nitrogen species (RONS). Optimizing the reactor parameter is an important approach to regulate RONS in PAW to obtain better biological effects. This work mainly focuses on the number of micro holes of the plasma device to realize underwater bubble discharge. By comparing single-hole and multi-hole plasma under the same pulse voltage, the multi-hole plasma would produce a better discharge characteristic, and the prepared PAW presents superior physicochemical properties to realize high level RONS production by means of microbubbles to increase the contact area with water molecules. Furthermore, the A549 lung carcinoma cells are used to verify the inactivation effect induced by PAW treated by underwater single-hole and multi-hole bubble plasma, respectively, and the results show that the multi-hole plasma would induce cell apoptosis reaching up to 57.4%, while only 31.2 % apoptosis efficiency for single-hole plasma. This mainly contributes to the high concentration of key species (NO2−, H2O2, ONOO−/O·2-, and ·OH) produced by multi-hole plasma. This study is helpful to insight into the influence of underwater bubble on chemistry activity of PAW, and promoting the wide applications in biomedical field.

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Section: Characterization Of Underwater Bubble Dischargesmentioning

confidence: 68%

Comparison of the physicochemical properties and inactivation against tumor cells of PAW induced by underwater single-hole and multi-hole bubble plasma

Liu¹,

Gao²,

Pang³

et al. 2022

J. Phys. D: Appl. Phys.

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“…The ionization path formed by the ionized plasma originally shows a fine filament, and a powerful arc discharge occurs after an ionization path is created between the two electrodes. A multichannel discharge technique based on the concept of voltage relays put forward by Zhang [23] was adopted in designing the MCPI. The MCPI was composed of six nickelcopper alloy electrodes, a semiconductor, and a ceramic insulator made of 95% alumina ceramic.…”

Section: Experimental Setup 21 Semiconductor Igniter and Multichannel...mentioning

confidence: 99%

Experimental investigation on electrical characteristics and ignition performance of multichannel plasma igniter

Huang

Song

et al. 2018

Chinese Phys. B

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Relighting of jet engines at high altitudes is very difficult because of the high velocity, low pressure, and low temperature of the inlet airflow. Successful ignition needs sufficient ignition energy to generate a spark kernel to induce a so-called critical flame initiation radius. However, at high altitudes with high-speed inlet airflow, the critical flame initiation radius becomes larger; therefore, traditional ignition technologies such as a semiconductor igniter (SI) become infeasible for use in high-altitude relighting of jet engines. In this study, to generate a large spark kernel to achieve successful ignition with high-speed inlet airflow, a new type of multichannel plasma igniter (MCPI) is proposed. Experiments on the electrical characteristics of the MCPI and SI were conducted under normal and sub-atmospheric pressures (P = 10-100 kPa). Ignition experiments for the MCPI and SI with a kerosene/air mixture in a triple-swirler combustor under different velocities of inlet airflow (60-110 m/s), with a temperature of 473 K at standard atmospheric pressure, were investigated. Results show that the MCPI generates much more arc discharge energy than the SI under a constant pressure; for example, the MCPI generated 6.93% and 16.05% more arc discharge energy than that of the SI at 30 kPa and 50 kPa, respectively. Compared to the SI, the MCPI generates a larger area and height of plasma heating zone, and induces a much larger initial spark kernel. Furthermore, the lean ignition limit of the MCPI and SI decreases with an increase in the velocity of the inlet airflow, and the maximum velocity of inlet airflow where the SI and MCPI can achieve successful and reliable ignition is 88.7 m/s and 102.2 m/s, respectively. Therefore, the MCPI has the advantage of achieving successful ignition with high-speed inlet airflow and extends the average ignition speed boundary of the kerosene/air mixture by 15.2%.

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“…Among the existing plasma aerodynamic excitation methods, dielectric barrier discharge plasma excitation has a small intensity and weak flow control effect, which is unsuitable for high‐speed flow control. [ 22,23 ] Furthermore, both the intensity of the pulsed microwave excitation and power consumption are large, and it is difficult to arrange multiple sets of excitations. [ 24 ] The plasma synthetic jet excitation can only drive 1–3 sets of excitations at the same time; hence, the flow control effect is weak.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on high‐energy surface arc plasma excitation control of cylindrical detached shock wave

Tang

Guo

Liang

2020

Contributions to Plasma Physics

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In this study, an electrical parameter test system and a high-speed Schlieren system are used to study the control of a cylindrical detached shock wave through high-energy surface arc plasma excitation. The results show that, when plasma excitation is not applied, the bow shockwave angle around the cylinder is 52 •. After the plasma excitation is applied, the arc discharge releases a large amount of heat within a short time, generating a shockwave and a control gas bulb (CGB). As a result, the bow shockwave angle first decreases and then increases, the pressure ratio before and after the shockwave decreases, and the intensity of the bow shockwave weakens. At t = 280 μs, the bow shockwave angle is reduced to a minimum of 46 •. The effective interference time of high-energy surface arc plasma excitation on a cylindrical detached shockwave is 820 μs. A high temperature is used to control the heating effect of the bubbles, which will increase the local sound velocity near the wall, reduce the local Mach number, cause the sound velocity to move online, and eventually push the bow shockwave away from the cylinder. Concurrently, heating will accelerate the gas flow, reduce the pressure, and cause the mass flow in the unit flow area of the heated area to decrease, resulting in a strong compression effect, which deforms the bow shockwave. The high-energy surface arc plasma excitation will provide a potential technical means for high-speed aircraft detached shockwave control.

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Experimental research on multichannel discharge circuit and multi-electrode plasma synthetic jet actuator

Cited by 26 publications

References 27 publications

Comparison of the physicochemical properties and inactivation against tumor cells of PAW induced by underwater single-hole and multi-hole bubble plasma

Comparison of the physicochemical properties and inactivation against tumor cells of PAW induced by underwater single-hole and multi-hole bubble plasma

Experimental investigation on electrical characteristics and ignition performance of multichannel plasma igniter

Experimental study on high‐energy surface arc plasma excitation control of cylindrical detached shock wave

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