Scholarlink

After multiple launches, the rail roughness of electromagnetic railguns increases significantly, which tends to cause complete local loss of contact at the rail–armature interface and consequently induces intense arc discharges. Based on a magnetohydrodynamic model, this study constructs a rail–armature interface geometry containing stochastic roughness to analyze the temporal evolution of arc morphology, temperature, and energy flux density under fully contact-loss conditions, and to investigate the influence of the number of micro-contact spots on arc-discharge intensity. The results show that when complete contact loss occurs, the arc becomes highly concentrated, with temperatures reaching up to 1.74 × 107 °C and energy flux densities up to 2.27 × 1012 W/m2, and it migrates toward the rear of the gap under airflow, forming a high-temperature ablation zone. As the number of micro-contact spots increases, arc energy disperses over more asperity peaks, leading to significant reductions in current density, temperature, and energy flux density. This study reveals the critical influence of rail roughness and micro-contact behavior on arc-discharge intensity, providing theoretical guidance for rail anti-ablation design and the improvement of launcher lifespan.

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Study on Arc Discharge Characteristics at the Armature-Rail Interface Under Fully Non-contact Conditions

  • 会议论文

  • 发表日期：

    2026年

查看全文
  • Jingtong Feng,
  • Jiali Liu,
  • Luyao Liu,
  • Ali Mohammed Ali Abdo,
  • Xi Chen,
  • Yang Shen,
  • Hongshun Liu

摘要

After multiple launches, the rail roughness of electromagnetic railguns increases significantly, which tends to cause complete local loss of contact at the rail–armature interface and consequently induces intense arc discharges. Based on a magnetohydrodynamic model, this study constructs a rail–armature interface geometry containing stochastic roughness to analyze the temporal evolution of arc morphology, temperature, and energy flux density under fully contact-loss conditions, and to investigate the influence of the number of micro-contact spots on arc-discharge intensity. The results show that when complete contact loss occurs, the arc becomes highly concentrated, with temperatures reaching up to 1.74 × 107 °C and energy flux densities up to 2.27 × 1012 W/m2, and it migrates toward the rear of the gap under airflow, forming a high-temperature ablation zone. As the number of micro-contact spots increases, arc energy disperses over more asperity peaks, leading to significant reductions in current density, temperature, and energy flux density. This study reveals the critical influence of rail roughness and micro-contact behavior on arc-discharge intensity, providing theoretical guidance for rail anti-ablation design and the improvement of launcher lifespan.