Using miniaturized Rogowski coils developed at ISL, we are able to measure the currents flowing through moving metallic fiber-armatures in a railgun. The 15 mm square bore railgun is 0.5 m in length and is powered by a 150 kJ capacitor bank. The peak current is about 200 kA and typical launch velocities with this test bed reach 600 m/s. The armature consists of two fiber brushes made of the same metal (e.g. Cu-Cd) or two different metals (e.g. brass and Cu-Cd). The current distribution between the two brushes has been measured during the shot. A special voltage probe placed on one rail provides information about the rail resistance variation during projectile passage. A comparison between the experimental results and the current distribution calculated with a three dimensional finite element code, taking into account thermal effects, is presented.
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机译:使用ISL开发的微型Rogowski线圈,我们能够测量流过枪炮中移动的金属纤维电枢的电流。 15毫米方孔轨道枪的长度为0.5 m,由150 kJ电容器组供电。该测试台的峰值电流约为200 kA,典型的发射速度达到600 m / s。电枢由两个由相同金属(例如Cu-Cd)或两种不同金属(例如黄铜和Cu-Cd)制成的纤维刷组成。在拍摄过程中已测量了两个刷子之间的电流分布。放在一根导轨上的特殊电压探头可提供有关弹丸通过过程中导轨电阻变化的信息。提出了一个实验结果和考虑到热效应的三维有限元代码计算的电流分布之间的比较。
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