Study on hydrogen dynamic leakage and flame propagation at normal-temperature and high-pressure |
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| Affiliation: | 1. School of Physics, Electronics and Intelligent Manufacturing, Huaihua University, Huaihua, 418000, China;2. Institute of Thermal Science&Technology, Shandong University, Jinan, 250000, China;3. Key Laboratory of Intelligent Control Technology for Wuling-Mountain Ecological Agriculture in Hunan Province, China;1. ENEA - Energy Technologies and Renewable Sources Department (TERIN), ICT Division, Portici Research Center, Piazzale Enrico Fermi 1, Portici 80055, Italy;2. Istituto di Scienze e Tecnologie per l’Energia e la Mobilità Sostenibili - CNR, Viale Marconi 4, 80125 Napoli, Italy;1. Dr. S. S. Bhatnagar University Institute of Chemical Engineering and Technology (Formerly Department of Chemical Engineering & Technology), Panjab University, Chandigarh, 160014, India;2. Department of Physics, Sunrise University, Alwar, Rajasthan, 301028, India;3. Cipla Limited, Malpur Upper, Baddi, Dist, Solan, 173205, India;4. Computational Physics & Materials Science Lab, Physical Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia;5. Centre for Nanoscience & Nanotechnology, University Institute for Emerging Areas in Science and Technology, Panjab University, Chandigarh, 160014, India;6. Energy Research Centre, Panjab University, Chandigarh, 160014, India;1. School of Materials Science and Engineering, Tianjin Chengjian University, 300384, Tianjin, China;2. Tianjin Key Laboratory of Building Green Functional Materials, Tianjin Chengjian University, 300384, Tianjin, China;1. College of Chemistry, Northeast Normal University, Changchun 130024, PR China;2. College of Environmental and Chemical Engineering, Xi''an Polytechnic University, Xi''an 710048, PR China |
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| Abstract: | Experiments of two nozzle diameters at three ignition positions under three initial pressure conditions were carried out. The dynamic leakage characteristics and the stagnation parameters of flame propagation under normal temperature and high pressure conditions were studied. Based on van der Waal's equation, a model for predicting stagnation parameters, jet velocity and flow rate of hydrogen leakage was proposed. Compared with the experimental results, it was found that the maximum error occurred when the initial pressure was 200 bar. Theoretical leakage time was 1.66 s, experiment leakage time was 1.84 s, the error was 9.8%. Background-Oriented Schlieren image technology was used to record the flame development and propagation process after ignition. For the same nozzle diameter and ignition location, the higher pressure caused the flame to propagate faster upstream and downstream. For the same initial pressure and ignition position, a flame with a large nozzle diameter propagated faster upstream and downstream. For the same initial pressure and nozzle diameter, the farther the ignition point was, the greater the slope of flame attenuation when propagating upstream. Due to the attenuation of hydrogen concentration and jet velocity, the flame propagation velocity to the downstream decreased linearly with the increase of distance from the ignition location. |
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| Keywords: | Hydrogen leakage Stagnation parameters Flame propagation |
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