Secondary explosion characteristics of TiH2 dust induced by hydrogen-oxygen detonations

• Published in: International journal of hydrogen energy 2024-08, Vol.80, p.858-870
• Main Authors: Qian, Jia-qi, Cheng, Yang-fan, Wei, Xiao, Xu, Jian-wei, Shen, Zhao-wu
• Format: Article
• Language: English
• Subjects: Dust explosion; Flame temperature; Hydrogen; Hydrogen storage material; Shock tube
• ISSN: 0360-3199
• DOI: 10.1016/j.ijhydene.2024.07.239

In the study, the secondary explosion characteristics of TiH2 dust with different particle sizes induced by hydrogen-oxygen detonations were studied, using a shock tube with semi-open and seal conditions. The processes of dispersal and deflagration were analyzed by a high-speed camera, and the explosion temperature and pressure were measured with the two-color pyrometer technique and pressure sensors, respectively. The experiment results showed that the dust clouds of TiH2 with smaller particle sizes were larger in volumes and more liable to combust. With the decrease of particle size, the deflagration processes of TiH2 dust became more intense, while their average temperatures had reverse trends, that is, lager particle sizes had higher average deflagration temperatures. Compared with the semi-open condition of shock tube, the duration of combustion under the confined condition was prolonged and the shock waves were enhanced for the wall reflection, which made the ignition of TiH2 dust more possible and the subsequent deflagration more violent. Furthermore, the effects of semi-open and seal conditions of shock tube on the peak pressures of secondary explosion were different, compared with no TiH2 dust addition, the peak pressures of secondary explosion with TiH2 powders decreased in semi-open condition but increased in seal condition. [Display omitted] •Secondary explosion of TiH2 dust induced by hydrogen detonation were simulated.•Dust lifting characteristics of TiH2 under the high-speed airflow were studied.•Dynamic flame temperature distributions of TiH2 dust explosion were mapped.•Gas-solid two-phase interaction effects during TiH2 dust explosion were analyzed.