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Title: Experimental Study on Shock Waves, Spontaneous Ignition and Flame Propagation Produced by Hydrogen Release through Tubes with Varying Obstacle Location // Proceedings of the Ninth International Seminar on Fire and Explosion Hazards. Vol. 2: 21-26 April 2019, Saint Petersburg, Russia
Creators: Li P.; Duan Q.; Zeng Q.; Gong L.; Jin K.; Qi K.; Sun J.
Organization: University of Science and Technology of China
Imprint: Saint Petersburg, 2019
Collection: Общая коллекция
Document type: Article, report
File type: PDF
Language: English
DOI: 10.18720/SPBPU/2/k19-16
Rights: Свободный доступ из сети Интернет (чтение, печать, копирование)

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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.

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