【摘要】 为了揭示电弧在开断过程中的复杂物理现象，建立的喷口电弧二维磁流体动力学数学模型，强调了电弧、气流、电磁场三者的相互作用，消除了因忽略Ｌｏｒｅｎｔｚ力和电流密度径向分量引起的物理意义失真．应用有限元法对模型中Ｎ－Ｓ（ＮａｖｉｅｒＳｔｏｋｅｓ）方程和二维电磁场方程进行数值求解．数值计算结果反映了Ｌｏｒｅｎｔｚ力以及电流密度径向分量对电弧特性的影响，同时揭示了电弧热边界区的存在．更多还原

【Abstract】 A 2D magnetohydrodynamic(MHD) mathematical model of nozzle arc is established in this paper, which emphasizes the interactions among the arc, the gas flow and the electromagnetic field. The defect caused by　ignorance of Lorentz force and the radial current density is eliminated. The 2D　NavierStokes equations and the electromagnetic field equations of the model are solved by finite element method. The numerical solutions reveal the existence of thermal boundary region and demonstrate the influences of Lorentz force and the radial current density on characteristics of the nozzle arc.更多还原