纵向磁场下真空电弧特性及其仿真研究
发布时间：2018-11-16 20:18
【摘要】：真空电弧是真空开关电器分断电流时所产生的物理现象，真空开关电器能否可靠地分断电流将取决于真空电弧能否被成功熄灭。因此，对真空电弧特性的研究是真空开关电器领域最重要的研究课题之一。由于真空电弧的复杂性，目前对真空电弧的物理过程及其特性的认识尚不完善，仅通过实验很难全面获取真空电弧重要参数及其特性。因此，还需要合理的运用理论及仿真研究，特别是利用数值仿真技术，通过建立合适的仿真模型，可以深入研究真空电弧的相关特性，进而为真空开关电器的设计与制造提供理论依据。 通过对真空电弧物理模型进行分析研究，考虑到广泛应用的真空电弧磁场控制技术，建立了纵向磁场真空电弧磁流体动力学的仿真物理模型。该仿真模型考虑了气流场与电磁场耦合、真空电弧等离子体离子与电子的相互碰撞等复杂情况，较全面地描述了真空电弧等离子区域的重要参数及其规律。通过对计算平台FLUENT进行二次开发，，采用VC++自编程和自定义宏函数，完成了纵向磁场真空电弧磁流体动力学模型的数值求解，实现了纵向磁场下真空电弧等离子体的数值仿真研究。 仿真结果表明，强电流真空电弧等离子体的密度、压力、马赫数和速度的分布不均匀，等离子体压力的最大值和等离子体密度的最大值都出现在阴极附近，而等离子体速度的最大值和马赫数的最大值则出现在阳极附近。通过对不同开断电流和不同开距下真空电弧等离子体的电流密度的仿真研究研究，揭示了开断电流的大小对于真空电弧的收缩程度具有影响作用。
[Abstract]:Vacuum arc is a physical phenomenon that occurs when the vacuum switcher breaks the current. Whether the vacuum switch can break the current reliably depends on whether the vacuum arc can be successfully extinguished. Therefore, the study of the characteristics of vacuum arc is one of the most important research topics in the field of vacuum switchgear. Due to the complexity of vacuum arc, the physical process and its characteristics of vacuum arc are not well understood, and it is difficult to obtain the important parameters and characteristics of vacuum arc through experiments. Therefore, it is necessary to apply the theory and simulation research reasonably, especially by using numerical simulation technology, through establishing appropriate simulation model, we can deeply study the related characteristics of vacuum arc. It provides theoretical basis for the design and manufacture of vacuum switchgear. Based on the analysis of the vacuum arc physical model and the widely used vacuum arc magnetic field control technology, the simulation physical model of the longitudinal magnetic field vacuum arc magnetohydrodynamics is established. The simulation model takes into account the coupling of airflow field and electromagnetic field, the interaction of plasma ions and electrons in vacuum arc, and describes the important parameters and rules of vacuum arc plasma region. Through the secondary development of FLUENT, VC self-programming and self-defined macro function, the numerical solution of the magnetohydrodynamic model of vertical magnetic field vacuum arc is completed. The numerical simulation of vacuum arc plasma in longitudinal magnetic field is realized. The simulation results show that the density, pressure, Mach number and velocity of the high current vacuum arc plasma are not uniformly distributed, the maximum plasma pressure and the maximum plasma density all appear near the cathode. The maximum plasma velocity and Mach number appear near the anode. Based on the simulation of the current density of vacuum arc plasma at different switching current and different open distance, it is revealed that the magnitude of breaking current has an effect on the shrinkage of vacuum arc.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM501.2
本文编号：2336539
[Abstract]:Vacuum arc is a physical phenomenon that occurs when the vacuum switcher breaks the current. Whether the vacuum switch can break the current reliably depends on whether the vacuum arc can be successfully extinguished. Therefore, the study of the characteristics of vacuum arc is one of the most important research topics in the field of vacuum switchgear. Due to the complexity of vacuum arc, the physical process and its characteristics of vacuum arc are not well understood, and it is difficult to obtain the important parameters and characteristics of vacuum arc through experiments. Therefore, it is necessary to apply the theory and simulation research reasonably, especially by using numerical simulation technology, through establishing appropriate simulation model, we can deeply study the related characteristics of vacuum arc. It provides theoretical basis for the design and manufacture of vacuum switchgear. Based on the analysis of the vacuum arc physical model and the widely used vacuum arc magnetic field control technology, the simulation physical model of the longitudinal magnetic field vacuum arc magnetohydrodynamics is established. The simulation model takes into account the coupling of airflow field and electromagnetic field, the interaction of plasma ions and electrons in vacuum arc, and describes the important parameters and rules of vacuum arc plasma region. Through the secondary development of FLUENT, VC self-programming and self-defined macro function, the numerical solution of the magnetohydrodynamic model of vertical magnetic field vacuum arc is completed. The numerical simulation of vacuum arc plasma in longitudinal magnetic field is realized. The simulation results show that the density, pressure, Mach number and velocity of the high current vacuum arc plasma are not uniformly distributed, the maximum plasma pressure and the maximum plasma density all appear near the cathode. The maximum plasma velocity and Mach number appear near the anode. Based on the simulation of the current density of vacuum arc plasma at different switching current and different open distance, it is revealed that the magnitude of breaking current has an effect on the shrinkage of vacuum arc.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM501.2
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