Numerical simulation method and system for breakdown voltage and position of low-pressure gas

Abstract

The invention provides a numerical simulation method and system for breakdown voltage and position of low-voltage gas. The method and the system are suitable for simulation of a gas discharge process between electrodes with complex structures in a vacuum environment. According to the method, on the basis that a discharge path is set as a gap electric field line, calculation domain grids are divided according to the discharge path and a potential equipotential line; after the initial number of electrons on the surface of a negative electrode is set, calculation is carried out according to electron movement, electron and atom collision, ion generation and secondary electron generation on the discharge path; then, the total secondary electron generation amount of each discharge path is compared, and the most probable breakdown path is screened out; and the secondary electron quantity of the path is compared with the initial electron quantity to judge whether critical breakdown can be triggered or not. According to the method, the breakdown voltage and the breakdown position between the electrodes with the complex structures can be estimated, and calculation efficiency is high.

Description

technical field [0001] The invention relates to the field of computing, in particular to a numerical simulation method and system for the breakdown voltage and position of low-pressure gas. Background technique [0002] Low-pressure gas breakdown is a common physical phenomenon between charged objects in a vacuum environment. On the one hand, it has a positive effect on electrode-induced discharge, such as the ignition of electric thrusters in the aerospace field. On the other hand, it has a positive effect on equipment insulation protection. There are negative effects. Therefore, how to effectively induce or avoid gas breakdown becomes the key to improving the application performance and reliability of vacuum equipment. The design connotation mainly refers to how to reasonably adjust the electrode structure and the relative position of the electrode in a specific gas pressure environment to optimize the gas breakdown voltage. Based on the above, the gas breakdown voltage ...

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Problems solved by technology

As far as the current engineering application requirements are concerned, the research and development of high-precision and high-efficiency algorithms has always been the core goal pursued by researchers. However, the above calculation methods can no longer meet the current application requirements: Paschen's law has the ability to quickly estimate, but It is only applicable to the working condition of one-dimensional structure, and the versatility is low; the streamer model can capture the development of the discharge path, but it is only applicable to the gas breakdown under high pressure, and loses the calculation accuracy for the breakdown problem in the vacuum environment; based on The modern numerical simulation method of the PIC model mainly has high calculation accuracy for the evolution of plasma parameters during the breakdown process, and is especially suitable for the unsteady simulation problem of the breakdown process, but it lacks pertinence for the estimation of the breakdown voltage. And the calculation time is generally longer, and the time cost is higher

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