In this paper, a passive muzzle arc control device (PMACD) of the augmented railguns is studied. By discussing its performance at different numbers of extra rails, a parameter optimization model is proposed. Through the calculation model, it is found that the PMACD works well in the simple railgun, which refers to the gun that there is only one pair of rails in the inner bore. The PMACD may decrease the simple railgun’s armature peak current and muzzle arc, but affect its muzzle velocity not much. However, in the augmented railguns it has different characteristics. If the parameters of the PMACD are not selected suitable. It may increase the armature peak current and muzzle arc, but greatly decrease the velocity. The reason for this problem is that the extra rails generate a strong magnetic field in front of the armature, which induces a large current to change the armature current. It is also found that when the resistance and inductance parameters of the PMACD satisfy with the optimization formula, the PMACD can also play a good role in arc suppression in the augmented railguns. Experiments of an augmented railgun with a stainless steel PMACD are carried out to verify this optimization method. Results show that the muzzle arc is obviously controlled. This work may provide a reference for the design of the muzzle arc control device.

本文研究了增强型轨道炮的被动枪口电弧控制装置（PMACD）。通过讨论其在不同数量的额外轨道上的性能，提出了一个参数优化模型。通过计算模型发现，PMACD在简单的轨道炮中表现良好，简单的轨道炮是指内膛只有一对轨道的炮。PMACD 可以降低简单轨道炮的电枢峰值电流和枪口电弧，但对其枪口速度的影响不大。然而，在增强型轨道炮中，它具有不同的特性。如果 PMACD 的参数选择不合适。它可能会增加电枢峰值电流和枪口电弧，但会大大降低速度。这个问题的原因是额外的导轨在衔铁前面产生了强大的磁场，从而感应出大电流来改变电枢电流。还发现，当PMACD的电阻和电感参数满足优化公式时，PMMACD在增强型轨道炮中也能起到很好的消弧作用。对带有不锈钢 PMACD 的增强型轨道炮进行了实验，以验证这种优化方法。结果表明，枪口弧度明显得到控制。该工作可为枪口电弧控制装置的设计提供参考。对带有不锈钢 PMACD 的增强型轨道炮进行了实验，以验证这种优化方法。结果表明，枪口弧度明显得到控制。该工作可为枪口电弧控制装置的设计提供参考。对带有不锈钢 PMACD 的增强型轨道炮进行了实验，以验证这种优化方法。结果表明，枪口弧度明显得到控制。该工作可为枪口电弧控制装置的设计提供参考。