To study the physical process of a cathode spot jet in vacuum arc discharge with a metal deuteride cathode (TiD), a two-dimensional hydrodynamic model based on three-fluid theory is established in this paper. The ionization and recombination of the plasma are considered in this model. The total current of the cathode spot is set to 2–4 A. The simulation shows that: (1) for Ti ions, there are huge pressure gradients and D–Ti ion collisions (10 13 –10 14 Pa m −1 ) in both the axial and radial direction near the cathode spot region, therefore the plasma jet will expand rapidly in all directions. For D ions, the ion collisions (D–Ti) play an important role in the whole region of the cathode spot jet, resulting in the velocity of a deuterium ion ( ##IMG## {${m_i}{n_i}({u_{\boldsymbol{i}}} \cdot \nabla ){u_{\boldsymbol{i}}} = - \nabla {p_i} + \nabla \cdot {\overline {\bar \tau } _i} + {Z_i}e{n_i}(E + {u_{\boldsymbol{i}}} \times B) + {R_i}$}

中文翻译：

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金属氘化物阴极在真空电弧放电中阴极点射流的三流体模拟

为了研究金属氘代阴极（TiD）在真空电弧放电中阴极点射流的物理过程，建立了基于三流体理论的二维流体动力学模型。在该模型中考虑了等离子体的电离和重组。阴极点的总电流设置为2–4A。模拟显示：（1）对于Ti离子，存在巨大的压力梯度和D–Ti离子碰撞（10 13 –10 14 Pa m -1）。阴极点区域附近的轴向和径向方向，因此等离子体射流将在所有方向上迅速膨胀。对于D离子，离子碰撞（D–Ti）在阴极点射流的整个区域中起着重要作用，