Natural gas vehicles have been widely used around the world as a mode of green transportation. The defect detection method for a vehicle cylinder, which is the energy storage component of a natural gas vehicle, is essential for ensuring safety. Current vehicle cylinder testing methods are relatively simple and cannot quickly and accurately detect internal defects in the winding layer of the cylinder. In this study, the effect of winding layer defects on the temperature behavior of cylinders during filling was studied using finite element simulation and infrared thermal imaging technology. The results show that a defect in the winding layer acts as a source of thermal resistance that hinders heat transfer. The more serious the defect is, the greater the hindrance of the heat transfer is. According to this principle, an evaluation model based on the R parameter was developed for the temperature changes due to defects, and a method for quantitatively correlating the maximum R value with the defect depth was established, thereby providing a practical approach for the rapid detection and evaluation of defects in cylinder winding layers.

天然气汽车作为一种绿色交通方式在世界范围内得到广泛应用。作为天然气汽车的储能部件，汽车气缸的缺陷检测方法对于确保安全至关重要。目前的汽车汽缸检测方法比较简单，不能快速准确地检测汽缸缠绕层的内部缺陷。在这项研究中，使用有限元模拟和红外热成像技术研究了缠绕层缺陷对填充过程中气缸温度行为的影响。结果表明，绕组层中的缺陷是阻碍热传递的热阻来源。缺陷越严重，传热的障碍就越大。根据这个原则，建立了与缺陷深度相关的R值，从而为圆柱绕组层缺陷的快速检测和评估提供了一种实用的方法。