低温氢气爆炸实验腔体预冷过程研究

To further study the characteristics of flame propagation and explosion wave properties of hydrogen in confined spaces under low-temperature conditions, an explosion chamber was designed, and its precooling process was undertaken. The experimental chamber was designed as a double-layer structure, and the low-temperature nitrogen gas was adopted as the precooling medium, to ensure the temperature of the premixed low-temperature hydrogen/air mixture can be maintained at the preset experimental condition. Based on the fundamental principles of thermodynamics, the steady thermal analysis approach was adopted, and a mathematical model of the chamber’s precooling process was established. The impacts of insulation layer thickness and chamber wall thickness on the precooling process were discussed, and the influences of precooling medium flow rate on precooling time and medium consumption were explored. The results revealed that, when the insulation layer thickness reached 30 mm, heat load from the environment significantly decreased. Compared with the 10 mm and 5 mm wall thickness conditions, the precooling time at 3 mm is reduced by 70.11% and 39.01% respectively, and the consumption is reduced by 70.12% and 39.00% respectively. Increasing the precooling medium flow rate can effectively shorten the precooling time, but the change in precooling medium consumption is not significant.