A lightweight type-4 cylinder is developed using a polyethylene terephthalate (PET) liner for application in drones. We conducted a parametric study on the internal phenomena of the developed cylinder during the filling process to examine the applicability of the cylinder to drones. First, we fabricated a type-4 cylinder with a volume of 6.8 L. Then, variations in pressure and temperature inside the cylinder were examined during the filling test. At the end of the filling test, the internal pressure reached 450 bar, and the temperature reached 58 °C. The expansion of the cylinder at the center of the cylinder body was larger than that at the dome knuckle. Subsequently, the effect of the inlet gas temperature on the internal phenomena of the developed cylinder was examined. As the inlet gas temperature decreased, both the temperature of the stored gas and the expansion rate decreased. Finally, the storage density of the developed cylinder was compared with that of other types of vessels. The storage density of the developed cylinder was equal to 4.8%, which higher than that of other types of cylinders. Through this study, the applicability of PET as a liner for a lightweight hydrogen storage cylinder was examined.

使用聚对苯二甲酸乙二酯（PET）衬里开发的轻型4型缸体可用于无人机。我们对已开发气缸在填充过程中的内部现象进行了参数研究，以检查气缸对无人机的适用性。首先，我们制造了一个容量为6.8 L的4型气缸。然后，在填充测试期间检查了气缸内部压力和温度的变化。在填充测试结束时，内部压力达到450 bar，温度达到58°C。圆柱体中心处的圆柱体的膨胀大于拱顶关节处的圆柱体的膨胀。随后，研究了进气温度对显影气缸内部现象的影响。随着进气温度的降低，储存气体的温度和膨胀率均降低。最后，将已开发圆柱体的存储密度与其他类型容器的存储密度进行了比较。显影气瓶的存储密度为4.8％，高于其他类型的气瓶。通过这项研究，研究了PET作为轻型储氢钢瓶衬里的适用性。