Pressure loading of detonation waves through 90-degree bend in high pressure H₂–O₂–N₂ mixtures

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• 作者：Masahiro Uchida^a ; ^{masahiro_uchida_1@ihi.co.jp} ; Toshiyuki Suda^a ; Toshiro Fujimori^a ; Tadashi Fujii^b ; Tetsuhiko Inagaki^c
• 关键词：Gaseous detonation ; Tube with 90-degree bend ; Detonation diffraction
• 刊名：Proceedings of the Combustion Institute
• 出版年：2011
• 出版时间：2011
• 年：2011
• 卷：33
• 期：2
• 页码：2327-2333
• 全文大小：549 K

文摘

Detonation experiments are conducted to investigate the detonation wave behavior in steam pipelines of boiling water reactors. Accumulated gases in BWRs are stoichiometric hydrogen/oxygen mixtures diluted with steam at 7 MPa. In the experiment, flammable gas mixture diluted with nitrogen at room temperature and up to 5 MPa is used to achieve equivalent detonation condition. Two test pieces are used, one is straight tube and the other is 90-degree bend. No initial pressure dependency in detonation wave behavior is observed in the experiments. However, in the straight tube tests, detonation velocities higher than theoretical values are measured when the initial pressures are greater than 2.3 MPa. This result is considered as attribution of real gas effect. In the 90-degree bend experiments, pressure time histories reveal pressure loads greater than the straight tube portion at two locations. One is a high pressure peak at the extrados of the bend and the other is a double pressure peak just downstream of the bend outlet. Second pressure peak just downstream of the bend outlet is due to transverse wave propagation. Additionally, the largest impulse is observed not at the extrados of the bend but at the intrados of bend outlet. These results show the importance of more investigations on transverse wave behaviors in failure potential evaluation.