Work

Evolution of temperature fields and heat transfer mechanisms in concrete structures subjected to hydrogen jet flame impingement

Year: 2026

Type: article

Abstract: To clarify the temperature field evolution and heat transfer mechanisms of concrete structures under hydrogen jet flames, a self-developed hydrogen gas jet flame exposure platform has been established. C30 concrete specimens were tested under hydrogen mass flow rates of 0.025, 0.0375, and 0.05 g/s and exposure durations of 30 and 60 min. Infrared thermography and embedded thermocouples were used for synchronous temperature measurement. The results showed that the peak surface temperature reached 912.8°C, and the internal temperature followed a three-stage evolution of rapid rise, 100°C stagnation plateau, and slow rise. Under 0.05 g/s-60 min condition, the 500°C and 300°C isotherms reached depths of 25 and nearly 50 mm, respectively. The penetration depth of the critical temperature front as determined through experiments provides a quantitative reference for local thermal protection of concrete components exposed to hydrogen gas jet fires, as well as for post fire detection.

Source: International Journal of Hydrogen Energy

DOI: 10.1016/j.ijhydene.2026.157807