电热化学炮同轴浮动电极式表面放电等离子体的数值模拟

Numerical Simulation of the Physical Field of the Coaxial Floating Electrode Type Surface Discharge Plasma Generator of an ETC Gun

以磁流体动力学为理论基础建立了电热化学炮同轴浮动电极式表面放电等离子体发生器物理场的数学模型,利用ANSYS FLUENT耦合准瞬态求解方法完成数值模拟,得到了等离子体电弧电势、磁感应强度、速度、温度等物理场的分布;通过后处理显示了每个浮动电极可能遭受的洛伦兹力,所得洛伦兹力用于分析同轴浮动电极式表面放电等离子体发生器受到的最大力矩以及力学特性;仿真并对比多种不同尺寸下同轴浮动电极式表面放电等离子体发生器的物理场,定性分析了物理场与不同尺寸的规律,选定了一种较优尺寸,为该等离子体发生器力学特性分析和设计提供参考和依据。

Based on the theory of magnetohydrodynamics,a mathematical model is established for the physical field of the coaxial floating electrode type surface discharge plasma generator of an ETC gun.The numerical simulation is completed by the ANSYS FLUENT coupling pseudo transient solution method and the plasma arc physical field distribution is identified,including the potential,magnetic induction intensity,velocity,temperature,etc.Through post-processing,the possible Lorentz force of each floating electrode is shown.The obtained Lorentz force is used to analyze the maximum torque and mechanical characteristics of the coaxial floating electrode surface discharge plasma generator.The physical fields of coaxial floating electrode surface discharge plasma generators of different sizes are simulated and compared.The relationship between physical field and size is qualitatively analyzed with a better size selected.The study provides a reference for the analysis of the mechanical characteristics and the design of such plasma generators.