Previous studies have shown that the performance of coaxial pulsed plasma thrusters depends on the ratio of propellant surface area-to-cavity volume. In this work, a double cylindrical propellant was introduced to increase the operation ratio compared to coaxial propellants; the results demonstrated that the geometric parameter obtained by dividing the ratio by the hollow diameter greatly influences the impulse bit. Also, direct observations and mass shot measurements revealed a higher density of the ablation gas from the cylindrical part than from the hollow part.

中文翻译：

---

双圆柱脉冲等离子推进器的脉冲钻头和烧蚀特性

先前的研究表明，同轴脉冲等离子推进器的性能取决于推进剂表面积与腔体体积之比。在这项工作中，引入了一种双圆柱推进剂以提高与同轴推进剂相比的工作效率。结果表明，通过将比率除以空心直径获得的几何参数极大地影响了脉冲钻头。另外，直接观察和大量测量显示，来自圆柱形部分的消融气体的密度高于来自中空部分的消融气体的密度。