Defect Detection in the Winding Layer of CNG Composite-Wound Cylindersvirtue of minimal mechanism is that it allows

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.