Effect of humidity and air pressure on the discharge modes transition characteristics of negative DC corona

Chen, She; Li, Kelin; Wang, Rui; Sun, Qiuqin; Zhong, Lipeng

doi:10.1049/iet-smt.2019.0032

Cited by 14 publications

(7 citation statements)

References 28 publications

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“…Specifically, it can be obtained that the ion mobility after fogging is about 98% of that in a dry environment. The reason for this phenomenon is that hydrated ions are generated by corona discharge in a foggy environment [43]. For the electric field strength, the droplets entering into the electrode area will affect the roughness coefficient of electrode surface, according to Peek's empirical formula [40]…”

Section: ¯¯( )mentioning

confidence: 99%

Efficient direction-independent fog harvesting using a corona discharge device with a multi-electrode structure

et al. 2022

Plasma Sci. Technol.

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Efficient collection of water from fog can effectively alleviate the problem of water shortage in foggy but water-scarce areas, such as desert, island and so on. Different with the inefficient fog meshes, corona discharge can release charged particles, charge water droplets and further enhance the water-collecting effect. This manuscript proposes a novel multi-electrode collecting structure, which can achieve the efficient and direction-independent collecting fog. The multi-electrode structure consists of three parts: charging electrode, intercepting electrode and ground electrode. Four types of water-collecting structures are compared experimentally, and the results show that the collection rates of traditional fog mesh, wire-mesh electrode with fog coming from high-voltage electrode (FH), wire-mesh electrode with fog coming from ground electrode (FG) and multi-electrode are 2~3 g/h, 100~120 g/h, 60~80 g/h, 200~220 g/h, respectively. The collection rate of multi-electrode structure is 100 ~ 150 times that of traditional fog mesh and 2 ~ 4 times that of wire-mesh electrode. These results demonstrate the superiority of the multi-electrode structure in fog collection. In addition, the motion equation of charged droplets in electric field is also derived, and the optimization strategy of electrode spacing is also discussed. This structure can be applied not only to fog collection, but also to air purification, factory waste gas treatment and other fields.

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Section: ¯¯( )mentioning

confidence: 99%

Efficient direction-independent fog harvesting using a corona discharge device with a multi-electrode structure

et al. 2022

Plasma Sci. Technol.

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“…Gas discharge in air under atmospheric pressure is affected by many factors, such as the temperature, the ambient humidity, the air impurity and so on [33,34]. These factors will also the propagation characteristic of the acoustic wave [35,36].…”

Section: Classification Of Discharging Modesmentioning

confidence: 99%

Classification of DC discharge modes based on acoustic signal

Xiong¹,

Wang²,

Li³

2022

Phys. Scr.

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Gas discharge will produce rich electromagnetic, optical as well as acoustic signals. Compared with the other signals, acoustic signals are also significant and would offer non-contact, low cost and easy-operation approach for online discharging monitoring, which require more attention and intensive study. In this paper, we studied the characteristics of acoustic signals in the corona, transient glow, spark, and glow discharging modes generated in a DC pin-to-pin configuration and developed a method using acoustic signals to classify the different discharge modes. The acoustic signals of the discharge at different gaps were recorded by adjusting the gap distance. 250 sets of acoustic signal samples were collected for each discharging mode. It was found that acoustic signals behave differently in different modes. Based on the short-time Fourier transform (STFT) of the acoustic signals, a novel method for discharge mode classification using the support vector machine (SVM) approach was developed. The final predictive accuracy of the trained classifier exceeds 90%.

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“…However, ionic wind cannot be generated in a purely vacuum condition, because there are no charge carriers for collisions without air. The pressure can affect the discharge mode [42], ionization [43], and onset and average currents [44], which are closely related to the ionic wind flow. Indeed, the observation of ionic wind could not have occurred earlier than the invention of a high-voltage generating machine.…”

Section: History Of Ionic Windmentioning

confidence: 99%

“…NO + (H 2 O) n + mH 2 O + N 2 → NO + (H 2 O) n+m + N 2(42) where m is 1, 2, or 3, and the number n depends on the temperature, pressure, and humidity. From the above reactions, it can be concluded that the main positive charge carriers in the positive corona discharge due to water are H + (H 2 O) n and NO + (H 2 O) n .…”

mentioning

confidence: 99%

A review on recent advances and challenges of ionic wind produced by corona discharges with practical applications

Qu¹,

Zeng²,

Zhang³

et al. 2021

J. Phys. D: Appl. Phys.

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Ionic wind, an induced phenomenon during corona discharge, possessing the features of silent operation and no moving parts, has a wide range of applications. Ionic wind generation is accompanied by complex physical processes, involving gas ionization, ion recombination, flow, and various chemical reactions, as well as mutual couplings between some of them. Therefore, understanding the corona discharge process and ionic wind generation is crucial for researchers and engineers to better utilize this phenomenon in practical applications. In this review, the principles of corona discharge and its induced ionic wind are presented. Subsequently, ionic wind generators (IWGs) are discussed according to their applications, and the corresponding advances based on experimental studies and numerical simulations are also reviewed. Moreover, the challenges of transitioning the ionic wind technology from laboratory studies to practical applications are discussed. These challenges include the excessively high onset voltage of the corona, ozone emission, and influence of environmental conditions. Furthermore, the mechanisms of these barriers and several effective approaches for mitigating them are provided. Finally, some future research prospects and the conclusions are presented.

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Effect of humidity and air pressure on the discharge modes transition characteristics of negative DC corona

Cited by 14 publications

References 28 publications

Efficient direction-independent fog harvesting using a corona discharge device with a multi-electrode structure

Efficient direction-independent fog harvesting using a corona discharge device with a multi-electrode structure

Classification of DC discharge modes based on acoustic signal

A review on recent advances and challenges of ionic wind produced by corona discharges with practical applications

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