Self-ignited flame behavior of high-pressure hydrogen release by rupture disk through a long tube |
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Authors: | Makoto Asahara Tei Saburi Toshiki Ando Yoshiaki Takahashi Takeshi Miyasaka Shiro Kubota |
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Affiliation: | 1. Department of Mechanical Engineering, Gifu University, 1-1 Yanagido, Gifu-shi, Gifu, 501-1193, Japan;2. National Institute of Advanced Industrial Science and Technology, 16-1 Onogawa, Tsukuba, Ibaraki, 305-8569, Japan |
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Abstract: | Accelerated adoption of hydrogen gas for energy storage requires improved safety for hydrogen storage. In particular, control of self-ignition of hydrogen vented through tubes by pressure relief devices (overpressure protection devices), such as rupture disks, is needed. We clarify the process of self-ignition in tubes of various lengths during venting of high-pressure hydrogen and observe flame behavior at the tube exit. The importance of distance from the rupture disk for flame front evolution is revealed. Specifically, in a tube longer than a critical value, the self-ignited flame undergoes a quenching process, possibly due to steam formation, before it exits the tube. A tube that is too short does not give the gas sufficient time for hydrogen and air mixing to initiate self-ignition. Finally, at slightly longer tube lengths, the hydrogen ignites, but the flame does not fully develop before it exits, and the vortex formed by expanding gas extinguishes it. |
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Keywords: | Self-ignition High-pressure hydrogen Rupture disk Jet flame Mixing boundary Overpressure protection device |
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