Experimental investigations were performed to evaluate the effects of obstacles inside tube on the pressure dynamics evolution, spontaneous ignition and flame propagation during pressurized hydrogen release. The obstacles region was consisted of seven metal obstacles and six metal spacers. Pressure transducers and light detectors were installed along the tube to measure pressure variation and hydrogen flame inside tube. The influence of obstacles was examined for three different locations inside tube. The results show that the strength of shock wave is weaken by flow divergence, and then gradually recovers as it travelling along the tube. The light signal analysis shows that the presence of obstacles in different locations has almost no influence on the minimum burst pressure for spontaneous ignition in our tests. However, the presence of obstacles plays an important role in the hydrogen combustion inside tube. Once the spontaneous ignition occurring inside tube, the reflected shock wave promotes combustion before obstacles. And the probability of the flame intensity enhancement increases with increasing distance between burst disk and obstacle location. In addition, the combustion inside tube is only temporarily intensified after obstacles.

International Seminar on Fire and Explosion Hazards (9; 2019; Saint Petersburg, Russia). Proceedings of the Ninth International Seminar on Fire and Explosion Hazards [Электронный ресурс]: 21-26 April 2019, Saint Petersburg, Russia. Vol. 2 / Peter the Great St. Petersburg Polytechnic University, Autonomous Non-Profit Organization "Fire and Explosion Safety", Gefest Holding Ltd ; [edited by A. Snegirev [et al.]. — Электрон. текстовые дан. (1 файл : 98,7 Мб). — Saint Petersburg, 2019. — Загл. с титул. экрана. — Свободный доступ из сети Интернет (чтение, печать, копирование). — Adobe Acrobat Reader 7.0. — <URL:http://elib.spbstu.ru/dl/2/k19-97.pdf>. — <URL:http://doi.org/10.18720/SPBPU/2/k19-97>.