Action Law and Deterioration Characteristics of Trigger Cavity of Plasma-Jet-Triggered Air-Gap Switch

Dong, Bingbing; Guo, Zhiyuan; Zhang, Zelin

doi:10.1109/tps.2022.3209151

Cited by 2 publications

(2 citation statements)

References 9 publications

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“…In order to verify the accuracy of the numerical model calculation, a test platform for plasma jet characteristics of gas gap switch is established in this work. The loop parameters, observation methods and data processing methods are referred to [21]. As shown in figure 6, the test platform is mainly composed of a trigger discharge circuit, integrated observation system, trigger control module, and environmental test chamber.…”

Section: Experimental Verification Of Plasma Jet Characteristicsmentioning

confidence: 99%

“…The velocity of the plasma jet at the nozzle of the trigger chamber was about 1.3 km•s −1 . Dong et al [21] used pseudo-color image processing methods to highlight the inherent characteristics of the plasma images and extracted the plasma characteristic regions by using an adaptive double-threshold algorithm for fine segmentation of the images to obtain the characteristic parameters characterizing its evolution process. However, during the development of the plasma jet, its brightness changed in real-time, making it difficult to accurately extract its characteristic parameters using a grey-scale threshold.…”

Section: Introductionmentioning

confidence: 99%

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Numerical simulation and experimental verification of plasma jet development in gas gap switch

Dong

Guo

Zhang

et al. 2023

Plasma Sci. Technol.

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Plasma jet triggered gas gap switch has obvious advantages in fast control switch. The development of the plasma in the ambient medium is the key factor affecting the triggering conduction of the gas switch. However, the plasma jet process and its characteristic parameters are complicated and the existing test methods cannot fully characterize its development laws. In this work, a two-dimensional transient fluid calculation model of the plasma jet process of the gas gap switch is established based on the renormalization-group (RNG) k-ε turbulence equation. The results show that the characteristic parameters and morphological evolution of the plasma jet are basically consistent with the experimental results, which verifies the accuracy of the simulation model calculation. The plasma jet is a long strip with an initial velocity of 1.0 km/s and develops in both axial and radial directions. The jet velocity fluctuates significantly with axial height. As the plasma jet enters the main gap, the pressure inside the trigger cavity drops by 80%, resulting in a rapid drop in the jet velocity. When the plasma jet head interacts with the atmosphere, the two-phase fluid compresses each other, generating a forward-propelled pressure wave. The plasma jet heads flow at high velocity, a negative pressure zone is formed in the middle part of the jet, and the pressure peak decreases gradually with the height. As the value of the inlet pressure increases, the characteristic parameters of the plasma jet increase. The entrainment phenomenon is evident, which leads to an increase in the pressure imbalance of the atmospheric gas medium, leading to significant Coandǎ effect. Compared with air, the characteristic parameters of plasma jet in SF6 are lower, and the morphological evolution is significantly suppressed. The results of this study can provide some insight into the mechanism of action of the switch jet plasma development process.

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Section: Experimental Verification Of Plasma Jet Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%